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

[Martin Liška]

Hi.

One obvious patch where we access src->lines one element after the end.

Survives gcov.exp tests, I'm going to install the patch.

Martin

gcc/ChangeLog:

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

        PR gcov-profile/85871
        * gcov.c (output_intermediate_file): Fix out of bounds
        access.
---
 gcc/gcov.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)



diff --git a/gcc/gcov.c b/gcc/gcov.c
index 6a24a320046..c6cf79b0f53 100644
--- a/gcc/gcov.c
+++ b/gcc/gcov.c
@@ -1085,7 +1085,8 @@ 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);
     }
 }