re PR sanitizer/64170 (ICE compiling Linux Kernel drivers/media/rc/imon.c in imon_incoming_packet)

	PR sanitizer/64170
	* sanopt.c (maybe_optimize_asan_check_ifn): If base_checks is
	non-NULL, call maybe_get_dominating_check on it even if g is
	non-NULL.

	* gcc.dg/asan/pr64170.c: New test.

From-SVN: r218440

gcc/ChangeLog

+2014-12-05  Jakub Jelinek  <jakub@redhat.com>
+
+	PR sanitizer/64170
+	* sanopt.c (maybe_optimize_asan_check_ifn): If base_checks is
+	non-NULL, call maybe_get_dominating_check on it even if g is
+	non-NULL.
+
 2014-12-05  Jeff Law  <law@redhat.com>
 
 	* doc/md.texi: Note problems using function calls to determine

gcc/sanopt.c

@@ -408,12 +408,13 @@ maybe_optimize_asan_check_ifn (struct sanopt_ctx *ctx, gimple stmt)
     }
 
   gimple g = maybe_get_dominating_check (*ptr_checks);
+  gimple g2 = NULL;
 
-  if (!g && base_checks)
+  if (base_checks)
     /* Try with base address as well.  */
-    g = maybe_get_dominating_check (*base_checks);
+    g2 = maybe_get_dominating_check (*base_checks);
 
-  if (!g)
+  if (g == NULL && g2 == NULL)
     {
       /* For this PTR we don't have any ASAN_CHECK stmts recorded, so there's
 	 nothing to optimize yet.  */

gcc/testsuite/ChangeLog

+2014-12-05  Jakub Jelinek  <jakub@redhat.com>
+
+	PR sanitizer/64170
+	* gcc.dg/asan/pr64170.c: New test.
+
 2014-12-05  Michael Meissner  <meissner@linux.vnet.ibm.com>
 
 	PR target/53199

gcc/testsuite/gcc.dg/asan/pr64170.c

+/* PR sanitizer/64170 */
+/* { dg-do compile } */
+/* { dg-options "-fsanitize=address,null" } */
+
+int a, *b, c;
+void bar (int);
+
+void
+foo (void)
+{
+  char *d = (char *) b;
+  if (d[0] && d[1])
+    return;
+  if (c)
+    a = *(int *) d;
+  bar (*(int *) d);
+}