linux-kernel - [PATCH v3] tools/perf/util: null-terminate version char array upon error

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Date:   Tue, 14 May 2019 13:44:42 -0400
From:   Donald Yandt <donald.yandt@...il.com>
To:     peterz@...radead.org
Cc:     mingo@...hat.com, acme@...nel.org,
        alexander.shishkin@...ux.intel.com, jolsa@...hat.com,
        yanmin_zhang@...ux.intel.com, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, Donald Yandt <donald.yandt@...il.com>
Subject: [PATCH v3] tools/perf/util: null-terminate version char array upon error

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 <donald.yandt@...il.com>
Fixes: a1645ce12adb ("perf: 'perf kvm' tool for monitoring guest performance from host")
---
 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 3c520baa1..28a9541c4 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