perf: Fix read buffer overflow

Check whether index is within bounds before testing the element.

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Cc: a.p.zijlstra@chello.nl
Cc: Andrew Morton <akpm@linux-foundation.org>
LKML-Reference: <4A757BCF.40101@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 1 insertions, 1 deletions

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 95fd06cdaa99..ce4f28645e64 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -253,7 +253,7 @@ static int strcommon(const char *pathname)
 {
         int n = 0;
 
-        while (pathname[n] == cwd[n] && n < cwdlen)
+        while (n < cwdlen && pathname[n] == cwd[n])
                 ++n;
 
         return n;