linux-kernel - [PATCH 1/5] perf record: Fix segfault with --no-mmap-pages

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Date:	Tue, 12 Nov 2013 07:46:53 -0700
From:	David Ahern <dsahern@...il.com>
To:	acme@...stprotocols.net, linux-kernel@...r.kernel.org
Cc:	mingo@...nel.org, jolsa@...hat.com,
	David Ahern <dsahern@...il.com>,
	Adrian Hunter <adrian.hunter@...el.com>
Subject: [PATCH 1/5] perf record: Fix segfault with --no-mmap-pages

Adrian reported a segfault when using --no-out-pages:
$ tools/perf/perf record -vv --no-out-pages uname
Segmentation fault (core dumped)

The same occurs with --no-mmap-pages. Fix by checking that str is non-NULL
before parsing it.

Reported-by: Adrian Hunter <adrian.hunter@...el.com>
Signed-off-by: David Ahern <dsahern@...il.com>
Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Jiri Olsa <jolsa@...hat.com>
---
 tools/perf/util/evlist.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 99dc58e5dcc3..3960560f873a 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -719,6 +719,9 @@ int perf_evlist__parse_mmap_pages(const struct option *opt, const char *str,
 		{ .tag  = 0 },
 	};
 
+	if (str == NULL)
+		return -1;
+
 	val = parse_tag_value(str, tags);
 	if (val != (unsigned long) -1) {
 		/* we got file size value */
-- 
1.8.3.4 (Apple Git-47)

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