linux-kernel - [PATCH] tools: perf: util: session.c: Cleaning up inconsistent NULL checks

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Date:	Thu, 22 May 2014 23:58:36 +0200
From:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>
Cc:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	David Ahern <dsahern@...il.com>, Jiri Olsa <jolsa@...hat.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Namhyung Kim <namhyung.kim@....com>,
	Stephane Eranian <eranian@...gle.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] tools: perf: util: session.c:  Cleaning up inconsistent NULL checks

Cleaning up inconsistent NULL checks.
There is otherwise a risk of a possible null pointer dereference.

Was largely found by using a static code analysis program called cppcheck.

Signed-off-by: Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
---
 tools/perf/util/session.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 55960f2..8defd80 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -1625,13 +1625,15 @@ out_delete_map:
 void perf_session__fprintf_info(struct perf_session *session, FILE *fp,
 				bool full)
 {
-	int fd = perf_data_file__fd(session->file);
+	int fd;
 	struct stat st;
 	int ret;
 
 	if (session == NULL || fp == NULL)
 		return;
 
+	fd = perf_data_file__fd(session->file);
+
 	ret = fstat(fd, &st);
 	if (ret == -1)
 		return;
-- 
1.7.10.4

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