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perf tests: Do not assume that readlink() returns a null terminated string

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Ensure that the string in buf is null terminated.

Signed-off-by: Tommi Rantala <tommi.t.rantala@nokia.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20170322130624.21881-4-tommi.t.rantala@nokia.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Tommi Rantala 2017-03-22 15:06:21 +02:00 committed by Arnaldo Carvalho de Melo
parent 5a2342111c
commit 0e6ba11511
1 changed files with 1 additions and 1 deletions
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tools/perf/tests/sdt.c
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@ -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;