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[PATCH] perf tools: Fix perf_evlist__alloc_mmap() failure path

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If zalloc fail, setting evlist->mmap[i].fd is unsafe.
perf_evlist__alloc_mmap() should fail right after zalloc() fail.

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: He Kuang <hekuang@huawei.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
---
 tools/perf/util/evlist.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index e0f3094..1b918aa 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -946,9 +946,12 @@ static int perf_evlist__alloc_mmap(struct perf_evlist *evlist)
 	if (cpu_map__empty(evlist->cpus))
 		evlist->nr_mmaps = thread_map__nr(evlist->threads);
 	evlist->mmap = zalloc(evlist->nr_mmaps * sizeof(struct perf_mmap));
+	if (!evlist->mmap)
+		return -ENOMEM;
+
 	for (i = 0; i < evlist->nr_mmaps; i++)
 		evlist->mmap[i].fd = -1;
-	return evlist->mmap != NULL ? 0 : -ENOMEM;
+	return 0;
 }
 
 struct mmap_params {
-- 
1.8.3.4

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[PATCH] perf tools: Fix perf_evlist__alloc_mmap() failure path Wang Nan <wangnan0@huawei.com> - 2016-05-31 15:10 +0200
  Re: [PATCH] perf tools: Fix perf_evlist__alloc_mmap() failure path Masami Hiramatsu <mhiramat@kernel.org> - 2016-05-31 15:30 +0200
    Re: [PATCH] perf tools: Fix perf_evlist__alloc_mmap() failure path Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-06-01 14:50 +0200
  [tip:perf/core] perf evlist: Fix alloc_mmap() failure path tip-bot for Wang Nan <tipbot@zytor.com> - 2016-06-08 10:40 +0200

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