linux-kernel - [PATCH perf/core] tools/perf/util/machine: Return NULL instead of null-terminating

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Message-Id: <20190521175453.2446-1-donald.yandt@gmail.com>
Date:   Tue, 21 May 2019 13:54:53 -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,
        Donald Yandt <donald.yandt@...il.com>
Subject: [PATCH perf/core] tools/perf/util/machine: Return NULL instead of null-terminating

Return NULL instead of null-terminating version char array when fgets fails due to end-of-file or error.

Signed-off-by: Donald Yandt <donald.yandt@...il.com>
---
 tools/perf/util/machine.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index 28a9541c4..6fd877220 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -1235,9 +1235,9 @@ static char *get_kernel_version(const char *root_dir)
 		return NULL;

 	tmp = fgets(version, sizeof(version), file);
-	if (!tmp)
-		*version = '\0';
 	fclose(file);
+	if (!tmp)
+		return NULL;

 	name = strstr(version, prefix);
 	if (!name)
--
2.20.1