Fix more memory faults uncovered by fuzzing various executables.

PR binutils/17512
	* dwarf.c (read_and_display_attr_value): Check that we do not read
	past end.
	(display_debug_pubnames_worker): Add range checks.
	(process_debug_info): Check for invalid pointer sizes.
	(display_loc_list): Likewise.
	(display_loc_list_dwo): Likewise.
	(display_debug_ranges): Likewise.
	(display_debug_aranges): Check for invalid address size.
	(read_cie): Add range checks.  Replace call strchr with while loop.
	* objdump.c (dump_dwarf): Replace abort with a warning message.
	(print_section_stabs): Improve range checks.
	* rdcoff.c (coff_get_slot): Use long for indx parameter type.
	Add check for an excesively large index.
	* rddbg.c (read_section_stabs_debugging_info): Zero terminate the
	string table.  Avoid walking off the end of the stabs data.
	* stabs.c (parse_stab_string): Add check for a NULL name.

	PR binutils/17512
	* coffcode.h (coff_slurp_line_table): Set the line number of
	corrupt entries to -1.
	(coff_slurp_symbol_table): Alway initialise the value of the
	symbol.
	* coffgen.c (coff_print_symbol): Check that the combined pointer
	is valid.
	(coff_print_symbol): Do not print negative line numbers.
	* peXXigen.c (pe_print_idata): Add range checking displaying
	member names.

bfd/ChangeLog

@@ -1,3 +1,16 @@
+2014-11-12  Nick Clifton  <nickc@redhat.com>
+
+	PR binutils/17512
+	* coffcode.h (coff_slurp_line_table): Set the line number of
+	corrupt entries to -1.
+	(coff_slurp_symbol_table): Alway initialise the value of the
+	symbol.
+	* coffgen.c (coff_print_symbol): Check that the combined pointer
+	is valid.
+	(coff_print_symbol): Do not print negative line numbers.
+	* peXXigen.c (pe_print_idata): Add range checking displaying
+	member names.
+
 2014-11-12  Alan Modra  <amodra@gmail.com>
 
 	PR binutils/17512

bfd/coffcode.h

@@ -4510,7 +4510,7 @@ coff_slurp_line_table (bfd *abfd, asection *asect)
   unsigned int counter;
   alent *cache_ptr;
   bfd_vma prev_offset = 0;
-  int ordered = 1;
+  bfd_boolean ordered = TRUE;
   unsigned int nbr_func;
   LINENO *src;
   bfd_boolean have_func;
@@ -4561,6 +4561,7 @@ coff_slurp_line_table (bfd *abfd, asection *asect)
 	      (*_bfd_error_handler)
 		(_("%B: warning: illegal symbol index 0x%lx in line number entry %d"),
 		 abfd, (long) symndx, counter);
+	      cache_ptr->line_number = -1;
 	      continue;
 	    }
 
@@ -4572,11 +4573,12 @@ coff_slurp_line_table (bfd *abfd, asection *asect)
 
 	  /* PR 17512 file: 078-10659-0.004  */
 	  if (sym < obj_symbols (abfd)
-	      || sym >= obj_symbols (abfd) + obj_raw_syment_count (abfd))
+	      || sym >= obj_symbols (abfd) + bfd_get_symcount (abfd))
 	    {
 	      (*_bfd_error_handler)
 		(_("%B: warning: illegal symbol in line number entry %d"),
 		 abfd, counter);
+	      cache_ptr->line_number = -1;
 	      continue;
 	    }
 
@@ -4590,7 +4592,7 @@ coff_slurp_line_table (bfd *abfd, asection *asect)
 
 	  sym->lineno = cache_ptr;
 	  if (sym->symbol.value < prev_offset)
-	    ordered = 0;
+	    ordered = FALSE;
 	  prev_offset = sym->symbol.value;
 	}
       else if (!have_func)
@@ -4625,6 +4627,8 @@ coff_slurp_line_table (bfd *abfd, asection *asect)
 	    if (lineno_cache[i].line_number == 0)
 	      *p++ = &lineno_cache[i];
 
+	  BFD_ASSERT ((p - func_table) == nbr_func);
+	  
 	  /* Sort by functions.  */
 	  qsort (func_table, nbr_func, sizeof (alent *), coff_sort_func_alent);
 
@@ -4650,6 +4654,8 @@ coff_slurp_line_table (bfd *abfd, asection *asect)
 		    *n_cache_ptr++ = *old_ptr++;
 		  while (old_ptr->line_number != 0);
 		}
+	      BFD_ASSERT ((bfd_size_type) (n_cache_ptr - n_lineno_cache) == (amt / sizeof (alent)));
+
 	      memcpy (lineno_cache, n_lineno_cache, amt);
 	    }
 	  bfd_release (abfd, func_table);
@@ -4710,6 +4716,8 @@ coff_slurp_symbol_table (bfd * abfd)
 	  dst->symbol.section = coff_section_from_bfd_index (abfd,
 						     src->u.syment.n_scnum);
 	  dst->symbol.flags = 0;
+	  /* PR 17512: file: 079-7098-0.001:0.1.  */
+	  dst->symbol.value = 0;
 	  dst->done_lineno = FALSE;
 
 	  switch (src->u.syment.n_sclass)

bfd/coffgen.c

@@ -2099,6 +2099,14 @@ coff_print_symbol (bfd *abfd,
 
 	  fprintf (file, "[%3ld]", (long) (combined - root));
 
+	  /* PR 17512: file: 079-33786-0.001:0.1.  */
+	  if (combined < obj_raw_syments (abfd)
+	      || combined >= obj_raw_syments (abfd) + obj_raw_syment_count (abfd))
+	    {
+	      fprintf (file, _("<corrupt info> %s"), symbol->name);
+	      break;
+	    }
+
 	  if (! combined->fix_value)
 	    val = (bfd_vma) combined->u.syment.n_value;
 	  else
@@ -2192,8 +2200,11 @@ coff_print_symbol (bfd *abfd,
 	      l++;
 	      while (l->line_number)
 		{
-		  fprintf (file, "\n%4d : ", l->line_number);
+		  if (l->line_number > 0)
-		  bfd_fprintf_vma (abfd, file, l->u.offset + symbol->section->vma);
+		    {
+		      fprintf (file, "\n%4d : ", l->line_number);
+		      bfd_fprintf_vma (abfd, file, l->u.offset + symbol->section->vma);
+		    }
 		  l++;
 		}
 	    }

bfd/peXXigen.c

@@ -1481,27 +1481,31 @@ pe_print_idata (bfd * abfd, void * vfile)
 #ifdef COFF_WITH_pex64
 	  for (j = 0; idx + j + 8 <= datasize; j += 8)
 	    {
+	      bfd_size_type amt;
 	      unsigned long member = bfd_get_32 (abfd, data + idx + j);
 	      unsigned long member_high = bfd_get_32 (abfd, data + idx + j + 4);
 
 	      if (!member && !member_high)
 		break;
 
+	      amt = member - adj;
+
 	      if (HighBitSet (member_high))
 		fprintf (file, "\t%lx%08lx\t %4lx%08lx  <none>",
 			 member_high, member,
 			 WithoutHighBit (member_high), member);
 	      /* PR binutils/17512: Handle corrupt PE data.  */
-	      else if ((bfd_vma) member - adj + 2 >= datasize)
+	      else if (amt + 2 >= datasize)
 		fprintf (file, _("\t<corrupt: 0x%04lx>"), member);
 	      else
 		{
 		  int ordinal;
 		  char *member_name;
 
-		  ordinal = bfd_get_16 (abfd, data + member - adj);
+		  ordinal = bfd_get_16 (abfd, data + amt);
-		  member_name = (char *) data + member - adj + 2;
+		  member_name = (char *) data + amt + 2;
-		  fprintf (file, "\t%04lx\t %4d  %s",member, ordinal, member_name);
+		  fprintf (file, "\t%04lx\t %4d  %.*s",member, ordinal,
+			   (int) (datasize - (amt + 2)), member_name);
 		}
 
 	      /* If the time stamp is not zero, the import address
@@ -1517,27 +1521,30 @@ pe_print_idata (bfd * abfd, void * vfile)
 #else
 	  for (j = 0; idx + j + 4 <= datasize; j += 4)
 	    {
+	      bfd_size_type amt;
 	      unsigned long member = bfd_get_32 (abfd, data + idx + j);
 
 	      /* Print single IMAGE_IMPORT_BY_NAME vector.  */
 	      if (member == 0)
 		break;
 
+	      amt = member - adj;
 	      if (HighBitSet (member))
 		fprintf (file, "\t%04lx\t %4lu  <none>",
 			 member, WithoutHighBit (member));
 	      /* PR binutils/17512: Handle corrupt PE data.  */
-	      else if ((bfd_vma) member - adj + 2 >= datasize)
+	      else if (amt + 2 >= datasize)
 		fprintf (file, _("\t<corrupt: 0x%04lx>"), member);
 	      else
 		{
 		  int ordinal;
 		  char *member_name;
 
-		  ordinal = bfd_get_16 (abfd, data + member - adj);
+		  ordinal = bfd_get_16 (abfd, data + amt);
-		  member_name = (char *) data + member - adj + 2;
+		  member_name = (char *) data + amt + 2;
-		  fprintf (file, "\t%04lx\t %4d  %s",
+		  fprintf (file, "\t%04lx\t %4d  %.*s",
-			   member, ordinal, member_name);
+			   member, ordinal,
+			   (int) (datasize - (amt + 2)), member_name);
 		}
 
 	      /* If the time stamp is not zero, the import address

binutils/ChangeLog

@@ -1,3 +1,23 @@
+2014-11-12  Nick Clifton  <nickc@redhat.com>
+
+	PR binutils/17512
+	* dwarf.c (read_and_display_attr_value): Check that we do not read
+	past end.
+	(display_debug_pubnames_worker): Add range checks.
+	(process_debug_info): Check for invalid pointer sizes.
+	(display_loc_list): Likewise.
+	(display_loc_list_dwo): Likewise.
+	(display_debug_ranges): Likewise.
+	(display_debug_aranges): Check for invalid address size.
+	(read_cie): Add range checks.  Replace call strchr with while loop.
+	* objdump.c (dump_dwarf): Replace abort with a warning message.
+	(print_section_stabs): Improve range checks.
+	* rdcoff.c (coff_get_slot): Use long for indx parameter type.
+	Add check for an excesively large index.
+	* rddbg.c (read_section_stabs_debugging_info): Zero terminate the
+	string table.  Avoid walking off the end of the stabs data.
+	* stabs.c (parse_stab_string): Add check for a NULL name.
+
 2014-11-11  Nick Clifton  <nickc@redhat.com>
 
 	PR binutils/17531

binutils/dwarf.c

@@ -399,7 +399,7 @@ process_extended_line_op (unsigned char * data,
 
   if (len == 0 || data == end)
     {
-      warn (_("badly formed extended line op encountered!\n"));
+      warn (_("Badly formed extended line op encountered!\n"));
       return bytes_read;
     }
 
@@ -1464,9 +1464,9 @@ read_and_display_attr_value (unsigned long attribute,
   unsigned char * orig_data = data;
   unsigned int bytes_read;
 
-  if (data == end && form != DW_FORM_flag_present)
+  if (data > end || (data == end && form != DW_FORM_flag_present))
     {
-      warn (_("corrupt attribute\n"));
+      warn (_("Corrupt attribute\n"));
       return data;
     }
 
@@ -1623,6 +1623,12 @@ read_and_display_attr_value (unsigned long attribute,
     case DW_FORM_exprloc:
       uvalue = read_uleb128 (data, & bytes_read, end);
       block_start = data + bytes_read;
+      /* PR 17512: file: 008-103549-0.001:0.1.  */
+      if (block_start + uvalue > end)
+	{
+	  warn (_("Corrupt attribute block length: %lx\n"), (long) uvalue);
+	  uvalue = end - block_start;
+	}
       if (do_loc)
 	data = block_start + uvalue;
       else
@@ -1632,6 +1638,11 @@ read_and_display_attr_value (unsigned long attribute,
     case DW_FORM_block1:
       SAFE_BYTE_GET (uvalue, data, 1, end);
       block_start = data + 1;
+      if (block_start + uvalue > end)
+	{
+	  warn (_("Corrupt attribute block length: %lx\n"), (long) uvalue);
+	  uvalue = end - block_start;
+	}
       if (do_loc)
 	data = block_start + uvalue;
       else
@@ -1641,6 +1652,11 @@ read_and_display_attr_value (unsigned long attribute,
     case DW_FORM_block2:
       SAFE_BYTE_GET (uvalue, data, 2, end);
       block_start = data + 2;
+      if (block_start + uvalue > end)
+	{
+	  warn (_("Corrupt attribute block length: %lx\n"), (long) uvalue);
+	  uvalue = end - block_start;
+	}
       if (do_loc)
 	data = block_start + uvalue;
       else
@@ -1650,6 +1666,11 @@ read_and_display_attr_value (unsigned long attribute,
     case DW_FORM_block4:
       SAFE_BYTE_GET (uvalue, data, 4, end);
       block_start = data + 4;
+      if (block_start + uvalue > end)
+	{
+	  warn (_("Corrupt attribute block length: %lx\n"), (long) uvalue);
+	  uvalue = end - block_start;
+	}
       if (do_loc)
 	data = block_start + uvalue;
       else
@@ -2184,7 +2205,7 @@ process_debug_info (struct dwarf_section *section,
 
       if (num_units == 0)
 	{
-	  error (_("No comp units in %s section ?"), section->name);
+	  error (_("No comp units in %s section ?\n"), section->name);
 	  return 0;
 	}
 
@@ -2193,7 +2214,7 @@ process_debug_info (struct dwarf_section *section,
                                                   sizeof (* debug_information));
       if (debug_information == NULL)
 	{
-	  error (_("Not enough memory for a debug info array of %u entries"),
+	  error (_("Not enough memory for a debug info array of %u entries\n"),
 		 num_units);
 	  return 0;
 	}
@@ -2271,6 +2292,13 @@ process_debug_info (struct dwarf_section *section,
 	}
 
       SAFE_BYTE_GET_AND_INC (compunit.cu_pointer_size, hdrptr, 1, end);
+      /* PR 17512: file: 001-108546-0.001:0.1.  */
+      if (compunit.cu_pointer_size < 2 || compunit.cu_pointer_size > 8)
+	{
+	  warn (_("Invalid pointer size (%d) in compunit header, using %d instead\n"),
+		compunit.cu_pointer_size, offset_size);
+	  compunit.cu_pointer_size = offset_size;
+	}
 
       if (do_types)
         {
@@ -2602,20 +2630,20 @@ read_debug_line_header (struct dwarf_section * section,
   SAFE_BYTE_GET_AND_INC (linfo->li_length, hdrptr, 4, end);
 
   if (linfo->li_length == 0xffffffff)
-	{
+    {
-	  /* This section is 64-bit DWARF 3.  */
+      /* This section is 64-bit DWARF 3.  */
       SAFE_BYTE_GET_AND_INC (linfo->li_length, hdrptr, 8, end);
-	  offset_size = 8;
+      offset_size = 8;
-	  initial_length_size = 12;
+      initial_length_size = 12;
-	}
+    }
-      else
+  else
-	{
+    {
-	  offset_size = 4;
+      offset_size = 4;
-	  initial_length_size = 4;
+      initial_length_size = 4;
-	}
+    }
 
   if (linfo->li_length + initial_length_size > section->size)
-	{
+    {
       /* If the length is just a bias against the initial_length_size then
 	 this means that the field has a relocation against it which has not
 	 been applied.  (Ie we are dealing with an object file, not a linked
@@ -2627,11 +2655,10 @@ read_debug_line_header (struct dwarf_section * section,
 	}
       else
 	{
-	  warn (_("The line info appears to be corrupt - "
+	  warn (_("The line info appears to be corrupt - the section is too small\n"));
-		  "the section is too small\n"));
 	  return NULL;
 	}
-	}
+    }
 
   /* Get and check the version number.  */
   SAFE_BYTE_GET_AND_INC (linfo->li_version, hdrptr, 2, end);
@@ -2639,25 +2666,25 @@ read_debug_line_header (struct dwarf_section * section,
   if (linfo->li_version != 2
       && linfo->li_version != 3
       && linfo->li_version != 4)
-	{
+    {
-	  warn (_("Only DWARF version 2, 3 and 4 line info is currently supported.\n"));
+      warn (_("Only DWARF version 2, 3 and 4 line info is currently supported.\n"));
       return NULL;
-	}
+    }
 
   SAFE_BYTE_GET_AND_INC (linfo->li_prologue_length, hdrptr, offset_size, end);
   SAFE_BYTE_GET_AND_INC (linfo->li_min_insn_length, hdrptr, 1, end);
 
   if (linfo->li_version >= 4)
-	{
+    {
       SAFE_BYTE_GET_AND_INC (linfo->li_max_ops_per_insn, hdrptr, 1, end);
 
       if (linfo->li_max_ops_per_insn == 0)
-	    {
+	{
-	      warn (_("Invalid maximum operations per insn.\n"));
+	  warn (_("Invalid maximum operations per insn.\n"));
 	  return NULL;
-	    }
 	}
-      else
+    }
+  else
     linfo->li_max_ops_per_insn = 1;
 
   SAFE_BYTE_GET_AND_INC (linfo->li_default_is_stmt, hdrptr, 1, end);
@@ -3204,7 +3231,7 @@ display_debug_lines_decoded (struct dwarf_section *section,
 
 		     if (ext_op_code_len == 0)
 		       {
-			 warn (_("badly formed extended line op encountered!\n"));
+			 warn (_("Badly formed extended line op encountered!\n"));
 			 break;
 		       }
 		     ext_op_code_len += bytes_read;
@@ -3598,11 +3625,17 @@ display_debug_pubnames_worker (struct dwarf_section *section,
 
       do
 	{
+	  bfd_size_type maxprint;
+
 	  SAFE_BYTE_GET (offset, data, offset_size, end);
 
 	  if (offset != 0)
 	    {
 	      data += offset_size;
+	      if (data >= end)
+		break;
+	      maxprint = (end - data) - 1;
+	      
 	      if (is_gnu)
 		{
 		  unsigned int kind_data;
@@ -3612,6 +3645,7 @@ display_debug_pubnames_worker (struct dwarf_section *section,
 
 		  SAFE_BYTE_GET (kind_data, data, 1, end);
 		  data++;
+		  maxprint --;
 		  /* GCC computes the kind as the upper byte in the CU index
 		     word, and then right shifts it by the CU index size.
 		     Left shift KIND to where the gdb-index.h accessor macros
@@ -3620,13 +3654,16 @@ display_debug_pubnames_worker (struct dwarf_section *section,
 		  kind = GDB_INDEX_SYMBOL_KIND_VALUE (kind_data);
 		  kind_name = get_gdb_index_symbol_kind_name (kind);
 		  is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (kind_data);
-		  printf ("    %-6lx  %s,%-10s  %s\n",
+		  printf ("    %-6lx  %s,%-10s  %.*s\n",
 			  offset, is_static ? _("s") : _("g"),
-			  kind_name, data);
+			  kind_name, (int) maxprint, data);
 		}
 	      else
-		printf ("    %-6lx\t%s\n", offset, data);
+		printf ("    %-6lx\t%.*s\n", offset, (int) maxprint, data);
-	      data += strnlen ((char *) data, end - data) + 1;
+
+	      data += strnlen ((char *) data, maxprint) + 1;
+	      if (data >= end)
+		break;
 	    }
 	}
       while (offset != 0);
@@ -4135,6 +4172,13 @@ display_loc_list (struct dwarf_section *section,
   unsigned short length;
   int need_frame_base;
 
+  if (pointer_size < 2 || pointer_size > 8)
+    {
+      warn (_("Invalid pointer size (%d) in debug info for entry %d\n"),
+	    pointer_size, debug_info_entry);
+      return;
+    }
+
   while (1)
     {
       if (start + 2 * pointer_size > section_end)
@@ -4247,6 +4291,13 @@ display_loc_list_dwo (struct dwarf_section *section,
   unsigned int idx;
   unsigned int bytes_read;
 
+  if (pointer_size < 2 || pointer_size > 8)
+    {
+      warn (_("Invalid pointer size (%d) in debug info for entry %d\n"),
+	    pointer_size, debug_info_entry);
+      return;
+    }
+
   while (1)
     {
       printf ("    %8.8lx ", offset + (start - *start_ptr));
@@ -4647,7 +4698,8 @@ display_debug_aranges (struct dwarf_section *section,
 
       address_size = arange.ar_pointer_size + arange.ar_segment_size;
 
-      if (address_size == 0)
+      /* PR 17512: file: 001-108546-0.001:0.1.  */
+      if (address_size == 0 || address_size > 8)
 	{
 	  error (_("Invalid address size in %s section!\n"),
 		 section->name);
@@ -4886,11 +4938,18 @@ display_debug_ranges (struct dwarf_section *section,
       unsigned long base_address;
 
       pointer_size = debug_info_p->pointer_size;
-
       offset = range_entry->ranges_offset;
       next = section_begin + offset;
       base_address = debug_info_p->base_address;
 
+      /* PR 17512: file: 001-101485-0.001:0.1.  */
+      if (pointer_size < 2 || pointer_size > 8)
+	{
+	  warn (_("Corrupt pointer size (%d) in debug entry at offset %8.8lx\n"),
+		pointer_size, offset);
+	  continue;
+	}
+      
       if (dwarf_check != 0 && i > 0)
 	{
 	  if (start < next)
@@ -5243,6 +5302,10 @@ read_cie (unsigned char *start, unsigned char *end,
   unsigned char *augmentation_data = NULL;
   unsigned long augmentation_data_len = 0;
 
+  /* PR 17512: file: 001-228113-0.004.  */
+  if (start >= end)
+    return end;
+
   fc = (Frame_Chunk *) xmalloc (sizeof (Frame_Chunk));
   memset (fc, 0, sizeof (Frame_Chunk));
 
@@ -5252,7 +5315,16 @@ read_cie (unsigned char *start, unsigned char *end,
   version = *start++;
 
   fc->augmentation = (char *) start;
-  start = (unsigned char *) strchr ((char *) start, '\0') + 1;
+  /* PR 17512: file: 001-228113-0.004.
+     Skip past augmentation name, but avoid running off the end of the data.  */
+  while (start < end)
+    if (* start ++ == '\0')
+      break;
+  if (start == end)
+    {
+      warn (_("No terminator for augmentation name\n"));
+      return start;
+    }
 
   if (strcmp (fc->augmentation, "eh") == 0)
     start += eh_addr_size;
@@ -6140,7 +6212,7 @@ display_debug_frames (struct dwarf_section *section,
 	      if (op >= DW_CFA_lo_user && op <= DW_CFA_hi_user)
 		printf (_("  DW_CFA_??? (User defined call frame op: %#x)\n"), op);
 	      else
-		warn (_("unsupported or unknown Dwarf Call Frame Instruction number: %#x\n"), op);
+		warn (_("Unsupported or unknown Dwarf Call Frame Instruction number: %#x\n"), op);
 	      start = block_end;
 	    }
 	}

binutils/objdump.c

@@ -2388,7 +2388,12 @@ dump_dwarf (bfd *abfd)
   else if (bfd_little_endian (abfd))
     byte_get = byte_get_little_endian;
   else
-    abort ();
+    /* PR 17512: file: objdump-s-endless-loop.tekhex.  */
+    {
+      warn (_("File %s does not contain any dwarf debug information\n"),
+	    bfd_get_filename (abfd));
+      return;
+    }
 
   switch (bfd_get_arch (abfd))
     {
@@ -2496,7 +2501,7 @@ print_section_stabs (bfd *abfd,
 
      We start the index at -1 because there is a dummy symbol on
      the front of stabs-in-{coff,elf} sections that supplies sizes.  */
-  for (i = -1; stabp < stabs_end; stabp += STABSIZE, i++)
+  for (i = -1; stabp <= stabs_end - STABSIZE; stabp += STABSIZE, i++)
     {
       const char *name;
       unsigned long strx;
@@ -2534,10 +2539,13 @@ print_section_stabs (bfd *abfd,
 	}
       else
 	{
+	  bfd_size_type amt = strx + file_string_table_offset;
+
 	  /* Using the (possibly updated) string table offset, print the
 	     string (if any) associated with this symbol.  */
-	  if ((strx + file_string_table_offset) < stabstr_size)
+	  if (amt < stabstr_size)
-	    printf (" %s", &strtab[strx + file_string_table_offset]);
+	    /* PR 17512: file: 079-79389-0.001:0.1.  */
+	    printf (" %.*s", (int)(stabstr_size - amt), strtab + amt);
 	  else
 	    printf (" *");
 	}

binutils/rdcoff.c

@@ -83,7 +83,7 @@ struct coff_types
   debug_type basic[T_MAX + 1];
 };
 
-static debug_type *coff_get_slot (struct coff_types *, int);
+static debug_type *coff_get_slot (struct coff_types *, long);
 static debug_type parse_coff_type
   (bfd *, struct coff_symbols *, struct coff_types *, long, int,
    union internal_auxent *, bfd_boolean, void *);
@@ -104,12 +104,17 @@ static bfd_boolean external_coff_symbol_p (int sym_class);
 /* Return the slot for a type.  */
 
 static debug_type *
-coff_get_slot (struct coff_types *types, int indx)
+coff_get_slot (struct coff_types *types, long indx)
 {
   struct coff_slots **pps;
 
   pps = &types->slots;
 
+  /* PR 17512: file: 078-18333-0.001:0.1.
+     FIXME: The value of 1000 is a guess.  Maybe a better heuristic is needed.  */
+  if (indx / COFF_SLOTS > 1000)
+    fatal (_("Excessively large slot index: %lx"), indx);
+
   while (indx >= COFF_SLOTS)
     {
       if (*pps == NULL)

binutils/rddbg.c

@@ -139,7 +139,7 @@ read_section_stabs_debugging_info (bfd *abfd, asymbol **syms, long symcount,
 	    }
 
 	  strsize = bfd_section_size (abfd, strsec);
-	  strings = (bfd_byte *) xmalloc (strsize);
+	  strings = (bfd_byte *) xmalloc (strsize + 1);
 	  if (! bfd_get_section_contents (abfd, strsec, strings, 0, strsize))
 	    {
 	      fprintf (stderr, "%s: %s: %s\n",
@@ -147,7 +147,8 @@ read_section_stabs_debugging_info (bfd *abfd, asymbol **syms, long symcount,
 		       bfd_errmsg (bfd_get_error ()));
 	      return FALSE;
 	    }
-
+	  /* Zero terminate the strings table, just in case.  */
+	  strings [strsize] = 0;
 	  if (shandle == NULL)
 	    {
 	      shandle = start_stab (dhandle, abfd, TRUE, syms, symcount);
@@ -159,7 +160,8 @@ read_section_stabs_debugging_info (bfd *abfd, asymbol **syms, long symcount,
 
 	  stroff = 0;
 	  next_stroff = 0;
-	  for (stab = stabs; stab < stabs + stabsize; stab += 12)
+	  /* PR 17512: file: 078-60391-0.001:0.1.  */
+	  for (stab = stabs; stab <= (stabs + stabsize) - 12; stab += 12)
 	    {
 	      unsigned int strx;
 	      int type;
@@ -184,33 +186,43 @@ read_section_stabs_debugging_info (bfd *abfd, asymbol **syms, long symcount,
 		}
 	      else
 		{
+		  size_t len;
 		  char *f, *s;
 
-		  f = NULL;
+		  if (stroff + strx >= strsize)
-
-		  if (stroff + strx > strsize)
 		    {
-		      fprintf (stderr, "%s: %s: stab entry %ld is corrupt, strx = 0x%x, type = %d\n",
+		      fprintf (stderr, _("%s: %s: stab entry %ld is corrupt, strx = 0x%x, type = %d\n"),
 			       bfd_get_filename (abfd), names[i].secname,
 			       (long) (stab - stabs) / 12, strx, type);
 		      continue;
 		    }
 
 		  s = (char *) strings + stroff + strx;
+		  f = NULL;
 
-		  while (s[strlen (s) - 1] == '\\'
+		  /* PR 17512: file: 002-87578-0.001:0.1.
+		     It is possible to craft a file where, without the 'strlen (s) > 0',
+		     an attempt to read the byte before 'strings' would occur.  */
+		  while ((len = strlen (s)) > 0
+			 && s[len  - 1] == '\\'
 			 && stab + 12 < stabs + stabsize)
 		    {
 		      char *p;
 
 		      stab += 12;
-		      p = s + strlen (s) - 1;
+		      p = s + len - 1;
 		      *p = '\0';
-		      s = concat (s,
+		      strx = stroff + bfd_get_32 (abfd, stab);
-				  ((char *) strings
+		      if (strx >= strsize)
-				   + stroff
+			{
-				   + bfd_get_32 (abfd, stab)),
+			  fprintf (stderr, _("%s: %s: stab entry %ld is corrupt\n"),
-				  (const char *) NULL);
+				   bfd_get_filename (abfd), names[i].secname,
+				   (long) (stab - stabs) / 12);
+			  break;
+			}
+		      else
+			s = concat (s, (char *) strings + strx,
+				    (const char *) NULL);
 
 		      /* We have to restore the backslash, because, if
 			 the linker is hashing stabs strings, we may

binutils/stabs.c

@@ -836,8 +836,6 @@ parse_stab_string (void *dhandle, struct stab_handle *info, int stabtype,
 
     case 'G':
       {
-	char leading;
-	long c;
 	asymbol **ps;
 
 	/* A global symbol.  The value must be extracted from the
@@ -846,19 +844,27 @@ parse_stab_string (void *dhandle, struct stab_handle *info, int stabtype,
 				 (debug_type **) NULL);
 	if (dtype == DEBUG_TYPE_NULL)
 	  return FALSE;
-	leading = bfd_get_symbol_leading_char (info->abfd);
+	if (name != NULL)
-	for (c = info->symcount, ps = info->syms; c > 0; --c, ++ps)
 	  {
-	    const char *n;
+	    char leading;
+	    long c;
 
-	    n = bfd_asymbol_name (*ps);
+	    leading = bfd_get_symbol_leading_char (info->abfd);
-	    if (leading != '\0' && *n == leading)
+	    for (c = info->symcount, ps = info->syms; c > 0; --c, ++ps)
-	      ++n;
+	      {
-	    if (*n == *name && strcmp (n, name) == 0)
+		const char *n;
-	      break;
+
+		n = bfd_asymbol_name (*ps);
+		if (leading != '\0' && *n == leading)
+		  ++n;
+		if (*n == *name && strcmp (n, name) == 0)
+		  break;
+	      }
+
+	    if (c > 0)
+	      value = bfd_asymbol_value (*ps);
 	  }
-	if (c > 0)
+
-	  value = bfd_asymbol_value (*ps);
 	if (! stab_record_variable (dhandle, info, name, dtype, DEBUG_GLOBAL,
 				    value))
 	  return FALSE;