linux-kernel - [tip:perf/core] perf intel-pt: Fix off-by-one comparison on maximum code

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Date:	Wed, 27 Apr 2016 08:33:36 -0700
From:	tip-bot for Colin Ian King <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	acme@...hat.com, colin.king@...onical.com,
	linux-kernel@...r.kernel.org, mingo@...nel.org,
	alexander.shishkin@...ux.intel.com, tglx@...utronix.de,
	hpa@...or.com, peterz@...radead.org, adrian.hunter@...el.com
Subject: [tip:perf/core] perf intel-pt: Fix off-by-one comparison on maximum
 code

Commit-ID:  c0664893050cc6b2d8b02d3e035f82fbfd0cd4cf
Gitweb:     http://git.kernel.org/tip/c0664893050cc6b2d8b02d3e035f82fbfd0cd4cf
Author:     Colin Ian King <colin.king@...onical.com>
AuthorDate: Sun, 24 Apr 2016 19:56:43 +0100
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Mon, 25 Apr 2016 20:35:59 -0300

perf intel-pt: Fix off-by-one comparison on maximum code

The check for the maximum code is off-by-one; the current comparison of
a code that is INTEL_PT_ERR_MAX will cause the strlcpy to perform an out
of bounds array access on the intel_pt_err_msgs array.

Fix this with a >= comparison.

Signed-off-by: Colin Ian King <colin.king@...onical.com>
Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/r/1461524203-10224-1-git-send-email-colin.king@canonical.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/intel-pt-decoder/intel-pt-decoder.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
index 9409d01..9c8f15d 100644
--- a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
+++ b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
@@ -356,7 +356,7 @@ static const char *intel_pt_err_msgs[] = {
 
 int intel_pt__strerror(int code, char *buf, size_t buflen)
 {
-	if (code < 1 || code > INTEL_PT_ERR_MAX)
+	if (code < 1 || code >= INTEL_PT_ERR_MAX)
 		code = INTEL_PT_ERR_UNK;
 	strlcpy(buf, intel_pt_err_msgs[code], buflen);
 	return 0;