From: Donald Yandt <[email protected]> If fgets() fails due to any other error besides end-of-file, the version char array may not even be null-terminated.
Signed-off-by: Donald Yandt <[email protected]> Cc: Alexander Shishkin <[email protected]> Cc: Avi Kivity <[email protected]> Cc: Jiri Olsa <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Yanmin Zhang <[email protected]> Fixes: a1645ce12adb ("perf: 'perf kvm' tool for monitoring guest performance from host") Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]> --- tools/perf/util/machine.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c index 3c520baa198c..28a9541c4835 100644 --- a/tools/perf/util/machine.c +++ b/tools/perf/util/machine.c @@ -1234,8 +1234,9 @@ static char *get_kernel_version(const char *root_dir) if (!file) return NULL; - version[0] = '\0'; tmp = fgets(version, sizeof(version), file); + if (!tmp) + *version = '\0'; fclose(file); name = strstr(version, prefix); -- 2.20.1
