Fix out-of-bounds in gcov.c (PR gcov-profile/85871).

2018-09-17  Martin Liska  <mliska@suse.cz>

	PR gcov-profile/85871
	* gcov.c (output_intermediate_file): Fix out of bounds
	access.

From-SVN: r264363

gcc/ChangeLog

+2018-09-17  Martin Liska  <mliska@suse.cz>
+
+	PR gcov-profile/85871
+	* gcov.c (output_intermediate_file): Fix out of bounds
+	access.
+
 2018-09-17  Vineet Gupta  <vgupta@synopsys.com>
 
 	* config/arc/arc.c: Object attributes for core4 not reflected

gcc/gcov.c

@@ -1097,7 +1097,8 @@ output_intermediate_file (FILE *gcov_file, source_info *src)
 	}
 
       /* Follow with lines associated with the source file.  */
-      output_intermediate_line (gcov_file, &src->lines[line_num], line_num);
+      if (line_num < src->lines.size ())
+	output_intermediate_line (gcov_file, &src->lines[line_num], line_num);
     }
 }