linux-kernel - [PATCH] perf session: Fix possible null pointer dereference in session.c

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Date:	Thu, 15 May 2014 02:13:38 +0900
From:	Masanari Iida <standby24x7@...il.com>
To:	a.p.zijlstra@...llo.nl, paulus@...ba.org, jolsa@...hat.com,
	acme@...nel.org, linux-kernel@...r.kernel.org
Cc:	Masanari Iida <standby24x7@...il.com>
Subject: [PATCH] perf session: Fix possible null pointer dereference in session.c

cppcheck detected following warning.
[tools/perf/util/session.c:1628] -> [tools/perf/util/session.c:1632]:
 (warning) Possible null pointer dereference: session - otherwise it
 is redundant to check it against null.

In order to avoide null pointer, check the pointer before use.

Signed-off-by: Masanari Iida <standby24x7@...il.com>
---
 tools/perf/util/session.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 55960f2..64a186e 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -1625,13 +1625,14 @@ out_delete_map:
 void perf_session__fprintf_info(struct perf_session *session, FILE *fp,
 				bool full)
 {
-	int fd = perf_data_file__fd(session->file);
 	struct stat st;
-	int ret;
+	int fd, ret;
 
 	if (session == NULL || fp == NULL)
 		return;
 
+	fd = perf_data_file__fd(session->file);
+
 	ret = fstat(fd, &st);
 	if (ret == -1)
 		return;
-- 
2.0.0.rc3.2.g998f840

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