linux-kernel - [PATCH 18/20] perf utils: use sizeof(buf)

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Message-Id: <20170328013915.15236-19-acme@kernel.org>
Date:   Mon, 27 Mar 2017 22:39:13 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        Tommi Rantala <tommi.t.rantala@...ia.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: [PATCH 18/20] perf utils: use sizeof(buf) - 1 in readlink() call

From: Tommi Rantala <tommi.t.rantala@...ia.com>

Ensure that we have space for the null byte in buf.

Signed-off-by: Tommi Rantala <tommi.t.rantala@...ia.com>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/r/20170322130624.21881-5-tommi.t.rantala@nokia.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/header.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 05714d548584..cf22962ce725 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -378,7 +378,7 @@ static int write_cmdline(int fd, struct perf_header *h __maybe_unused,
 	 * actual atual path to perf binary
 	 */
 	sprintf(proc, "/proc/%d/exe", getpid());
-	ret = readlink(proc, buf, sizeof(buf));
+	ret = readlink(proc, buf, sizeof(buf) - 1);
 	if (ret <= 0)
 		return -1;
 
-- 
2.9.3