re PR gcov-profile/55417 (AddressSanitizer reports stack-buffer-overflow in profiling code)

	PR gcov-profile/55417
	* profile.c (compute_working_sets): Check index first
	to avoid out-of-bounds array access.

From-SVN: r193697

gcc/ChangeLog

+2012-11-21  Teresa Johnson  <tejohnson@google.com>
+
+	PR gcov-profile/55417
+	* profile.c (compute_working_sets): Check index first
+	to avoid out-of-bounds array access.
+
 2012-11-21  Matthias Klose  <doko@ubuntu.com>
 
 	* config/aarch64/t-aarch64-linux: Define MULTIARCH_DIRNAME for
@@ -1400,7 +1406,7 @@
 	* cppdefault.h (default_include): Document multiarch in multilib
 	member.
 	* cppdefault.c: [LOCAL_INCLUDE_DIR, STANDARD_INCLUDE_DIR] Add an
-        include directory for multiarch directories.
+	include directory for multiarch directories.
 	* common.opt: New options --print-multiarch and -imultilib.
 	* config.gcc <i[34567]86-*-linux* | x86_64-*-linux*> (tmake_file):
 	Include i386/t-linux.

gcc/profile.c

@@ -288,11 +288,11 @@ compute_working_sets (void)
           else
             tmp_cum = cum + histo_bucket->cum_value;
 
-          /* Next walk through successive working set entries and fill in
-            the statistics for any whose size we have reached by accumulating
-            this histogram counter.  */
-          while (tmp_cum >= working_set_cum_values[ws_ix]
-                 && ws_ix < NUM_GCOV_WORKING_SETS)
+	  /* Next walk through successive working set entries and fill in
+	     the statistics for any whose size we have reached by accumulating
+	     this histogram counter.  */
+	  while (ws_ix < NUM_GCOV_WORKING_SETS
+		 && tmp_cum >= working_set_cum_values[ws_ix])
             {
               gcov_working_sets[ws_ix].num_counters = count;
               gcov_working_sets[ws_ix].min_counter