* [PATCH, committed] Fortran: NULL pointer dereference in invalid simplification [PR106985]
@ 2022-09-20 20:35 Harald Anlauf
0 siblings, 0 replies; only message in thread
From: Harald Anlauf @ 2022-09-20 20:35 UTC (permalink / raw)
To: fortran, gcc-patches
[-- Attachment #1: Type: text/plain, Size: 310 bytes --]
Dear all,
Gerhard found a NULL pointer dereference in a PARAMETER declaration
that referenced the same declared parameter.
Simple & obvious enough, see attached patch.
Regtested on x86_64-pc-linux-gnu, and pushed to mainline:
https://gcc.gnu.org/g:8dbb15bc2d019488240c1e69d93121b0347ac092
Thanks,
Harald
[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #2: pr106985.diff --]
[-- Type: text/x-patch, Size: 1761 bytes --]
From 8dbb15bc2d019488240c1e69d93121b0347ac092 Mon Sep 17 00:00:00 2001
From: Harald Anlauf <anlauf@gmx.de>
Date: Tue, 20 Sep 2022 22:23:43 +0200
Subject: [PATCH] Fortran: NULL pointer dereference in invalid simplification
[PR106985]
gcc/fortran/ChangeLog:
PR fortran/106985
* expr.cc (gfc_simplify_expr): Avoid NULL pointer dereference.
gcc/testsuite/ChangeLog:
PR fortran/106985
* gfortran.dg/pr106985.f90: New test.
---
gcc/fortran/expr.cc | 3 ++-
gcc/testsuite/gfortran.dg/pr106985.f90 | 8 ++++++++
2 files changed, 10 insertions(+), 1 deletion(-)
create mode 100644 gcc/testsuite/gfortran.dg/pr106985.f90
diff --git a/gcc/fortran/expr.cc b/gcc/fortran/expr.cc
index be94c18c836..290ddf360c8 100644
--- a/gcc/fortran/expr.cc
+++ b/gcc/fortran/expr.cc
@@ -2287,7 +2287,8 @@ gfc_simplify_expr (gfc_expr *p, int type)
initialization expression, or we want a subsection. */
if (p->symtree->n.sym->attr.flavor == FL_PARAMETER
&& (gfc_init_expr_flag || p->ref
- || p->symtree->n.sym->value->expr_type != EXPR_ARRAY))
+ || (p->symtree->n.sym->value
+ && p->symtree->n.sym->value->expr_type != EXPR_ARRAY)))
{
if (!simplify_parameter_variable (p, type))
return false;
diff --git a/gcc/testsuite/gfortran.dg/pr106985.f90 b/gcc/testsuite/gfortran.dg/pr106985.f90
new file mode 100644
index 00000000000..f4ed92577a3
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/pr106985.f90
@@ -0,0 +1,8 @@
+! { dg-do compile }
+! PR fortran/106985 - ICE in gfc_simplify_expr
+! Contributed by G.Steinmetz
+
+program p
+ integer, parameter :: a(2) = 1
+ integer, parameter :: b = a(2) + b ! { dg-error "before its definition is complete" }
+end
--
2.35.3
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2022-09-20 20:35 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2022-09-20 20:35 [PATCH, committed] Fortran: NULL pointer dereference in invalid simplification [PR106985] Harald Anlauf
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).