From ae4438537fbc2ed04f3b0fb32d4e02b0ed6977a1 Mon Sep 17 00:00:00 2001
From: Harald Anlauf <anlauf@gmx.de>
Date: Sat, 10 Dec 2022 22:05:15 +0100
Subject: Fortran: reject bad SIZE argument while simplifying ISHFTC [PR106911]

gcc/fortran/ChangeLog:

	PR fortran/106911
	* simplify.cc (gfc_simplify_ishftc): If the SIZE argument is known
	to be outside the allowed range, terminate simplification.

gcc/testsuite/ChangeLog:

	PR fortran/106911
	* gfortran.dg/pr106911.f90: New test.
---
 gcc/fortran/simplify.cc | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'gcc/fortran')

diff --git a/gcc/fortran/simplify.cc b/gcc/fortran/simplify.cc
index aff9a1b..3d3aaba 100644
--- a/gcc/fortran/simplify.cc
+++ b/gcc/fortran/simplify.cc
@@ -3955,6 +3955,9 @@ gfc_simplify_ishftc (gfc_expr *e, gfc_expr *s, gfc_expr *sz)
 	return NULL;
 
       gfc_extract_int (sz, &ssize);
+
+      if (ssize > isize || ssize <= 0)
+	return &gfc_bad_expr;
     }
   else
     ssize = isize;
-- 
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