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Fortran: fix NULL pointer dereference in gfc_check_dependency [PR108502]

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gcc/fortran/ChangeLog:

	PR fortran/108502
	* dependency.cc (gfc_check_dependency): Prevent NULL pointer
	dereference while recursively checking expressions.

gcc/testsuite/ChangeLog:

	PR fortran/108502
	* gfortran.dg/pr108502.f90: New test.
This commit is contained in:
Harald Anlauf 2023-01-23 22:13:44 +01:00
parent e3585e6acd
commit 51767f3187
2 changed files with 17 additions and 0 deletions
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5
gcc/fortran/dependency.cc
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@ -1292,6 +1292,11 @@ gfc_check_dependency (gfc_expr *expr1, gfc_expr *expr2, bool identical)
if (expr1->expr_type != EXPR_VARIABLE)
gfc_internal_error ("gfc_check_dependency: expecting an EXPR_VARIABLE");
/* Prevent NULL pointer dereference while recursively analyzing invalid
expressions. */
if (expr2 == NULL)
return 0;
switch (expr2->expr_type)
{
case EXPR_OP:

12
gcc/testsuite/gfortran.dg/pr108502.f90 Normal file
View file

@ -0,0 +1,12 @@
! { dg-do compile }
! { dg-options "-O2 -ffrontend-optimize" }
! PR fortran/108502 - ICE in gfc_check_dependency
! Contributed by G.Steinmetz
integer function n()
integer :: a(1)
a = [1] / 0
end
program p
integer :: b = n() ! { dg-error "must be an intrinsic function" }
end