linux-kernel - [PATCH 4/6] perf utils: use sizeof(buf)-1 in readlink() call

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Date:   Wed, 22 Mar 2017 15:06:22 +0200
From:   Tommi Rantala <tommi.t.rantala@...ia.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>
CC:     <linux-kernel@...r.kernel.org>,
        Tommi Rantala <tommi.t.rantala@...ia.com>
Subject: [PATCH 4/6] perf utils: use sizeof(buf)-1 in readlink() call

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

Signed-off-by: Tommi Rantala <tommi.t.rantala@...ia.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 05714d5..ab10e9d 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