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* [gcc r11-10503] Fortran: fix NULL pointer dereference in gfc_check_dependency [PR108502]
@ 2023-02-04 15:43 Harald Anlauf
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From: Harald Anlauf @ 2023-02-04 15:43 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:d7ec0bdfeae883d852d7c0dfc67766a3793f5892
commit r11-10503-gd7ec0bdfeae883d852d7c0dfc67766a3793f5892
Author: Harald Anlauf <anlauf@gmx.de>
Date: Mon Jan 23 22:13:44 2023 +0100
Fortran: fix NULL pointer dereference in gfc_check_dependency [PR108502]
gcc/fortran/ChangeLog:
PR fortran/108502
* dependency.c (gfc_check_dependency): Prevent NULL pointer
dereference while recursively checking expressions.
gcc/testsuite/ChangeLog:
PR fortran/108502
* gfortran.dg/pr108502.f90: New test.
(cherry picked from commit 51767f31878a95161142254dca7119b409699670)
Diff:
---
gcc/fortran/dependency.c | 5 +++++
gcc/testsuite/gfortran.dg/pr108502.f90 | 12 ++++++++++++
2 files changed, 17 insertions(+)
diff --git a/gcc/fortran/dependency.c b/gcc/fortran/dependency.c
index e1336e1c654..7a3cc82a5b2 100644
--- a/gcc/fortran/dependency.c
+++ b/gcc/fortran/dependency.c
@@ -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:
diff --git a/gcc/testsuite/gfortran.dg/pr108502.f90 b/gcc/testsuite/gfortran.dg/pr108502.f90
new file mode 100644
index 00000000000..45f73849c57
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/pr108502.f90
@@ -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
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