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

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Message-ID: <tip-c5765ece8a050836c6255e1276fc8e0e867078da@git.kernel.org>
Date:	Tue, 20 May 2014 22:55:02 -0700
From:	tip-bot for Masanari Iida <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	jolsa@...nel.org, tglx@...utronix.de, standby24x7@...il.com
Subject: [tip:perf/core] perf session:
  Fix possible null pointer dereference in session.c

Commit-ID:  c5765ece8a050836c6255e1276fc8e0e867078da
Gitweb:     http://git.kernel.org/tip/c5765ece8a050836c6255e1276fc8e0e867078da
Author:     Masanari Iida <standby24x7@...il.com>
AuthorDate: Thu, 15 May 2014 02:13:38 +0900
Committer:  Jiri Olsa <jolsa@...nel.org>
CommitDate: Fri, 16 May 2014 09:18:51 +0200

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>
Link: http://lkml.kernel.org/r/1400087618-13628-1-git-send-email-standby24x7@gmail.com
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
 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;
--
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