linux-kernel - [PATCH 3/6] perf tests: do not assume that readlink() returns a null terminated string

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Date:   Wed, 22 Mar 2017 15:06:21 +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 3/6] perf tests: do not assume that readlink() returns a null terminated string

Ensure that the string in buf is null terminated.

Signed-off-by: Tommi Rantala <tommi.t.rantala@...ia.com>
---
 tools/perf/tests/sdt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/tests/sdt.c b/tools/perf/tests/sdt.c
index f59d210..121949a 100644
--- a/tools/perf/tests/sdt.c
+++ b/tools/perf/tests/sdt.c
@@ -43,7 +43,7 @@ static char *get_self_path(void)
 {
 	char *buf = calloc(PATH_MAX, sizeof(char));
 
-	if (buf && readlink("/proc/self/exe", buf, PATH_MAX) < 0) {
+	if (buf && readlink("/proc/self/exe", buf, PATH_MAX-1) < 0) {
 		pr_debug("Failed to get correct path of perf\n");
 		free(buf);
 		return NULL;
-- 
2.9.3