* [PATCH] Fix PR67271
@ 2015-09-16 14:24 Richard Biener
0 siblings, 0 replies; only message in thread
From: Richard Biener @ 2015-09-16 14:24 UTC (permalink / raw)
To: gcc-patches
Bootstrapped / tested on x86_64-unknown-linux-gnu, applied.
Richard.
2015-09-16 Richard Biener <rguenther@suse.de>
PR middle-end/67271
* fold-const.c (native_encode_expr): Bail out on bogus offsets.
* gcc.dg/pr67271.c: New testcase.
Index: gcc/fold-const.c
===================================================================
--- gcc/fold-const.c (revision 227779)
+++ gcc/fold-const.c (working copy)
@@ -7106,6 +7127,10 @@ native_encode_string (const_tree expr, u
int
native_encode_expr (const_tree expr, unsigned char *ptr, int len, int off)
{
+ /* We don't support starting at negative offset and -1 is special. */
+ if (off < -1)
+ return 0;
+
switch (TREE_CODE (expr))
{
case INTEGER_CST:
Index: gcc/testsuite/gcc.dg/pr67271.c
===================================================================
--- gcc/testsuite/gcc.dg/pr67271.c (revision 0)
+++ gcc/testsuite/gcc.dg/pr67271.c (working copy)
@@ -0,0 +1,12 @@
+/* { dg-do compile } */
+/* { dg-options "-O" } */
+
+extern long int labs (long int j);
+int
+main ()
+{
+ long *a = (long *)"empty";
+ int i = 1441516387;
+ a[i] = labs (a[i]);
+ return 0;
+}
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