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authorWang Nan <wangnan0@huawei.com>2016-02-26 09:32:17 +0000
committerArnaldo Carvalho de Melo <acme@redhat.com>2016-03-03 11:10:36 -0300
commit95c365617aa37878592f2f1c6c64e1abb19f0d4a (patch)
tree6217b75ff3a02ef9e4f0ca1020efb096ec331e24 /tools/perf
parente1ab48ba63ee6b2494a67bb60bf99692ecdaca7c (diff)
downloadlinux-95c365617aa37878592f2f1c6c64e1abb19f0d4a.tar.gz
perf record: Ensure return non-zero rc when mmap fail
perf_evlist__mmap_ex() can fail without setting errno (for example, fail in condition checking. In this case all syscall is success). If this happen, record__open() incorrectly returns 0. Force setting rc is a quick way to avoid this problem, or we have to follow all possible code path in perf_evlist__mmap_ex() to make sure there's at least one system call before returning an error. Signed-off-by: Wang Nan <wangnan0@huawei.com> Cc: Alexei Starovoitov <ast@kernel.org> Cc: He Kuang <hekuang@huawei.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Li Zefan <lizefan@huawei.com> Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Zefan Li <lizefan@huawei.com> Cc: pi3orama@163.com Link: http://lkml.kernel.org/r/1456479154-136027-30-git-send-email-wangnan0@huawei.com Signed-off-by: He Kuang <hekuang@huawei.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf')
-rw-r--r--tools/perf/builtin-record.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 46e2772f838e..515510ecc76a 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -324,7 +324,10 @@ try_again:
} else {
pr_err("failed to mmap with %d (%s)\n", errno,
strerror_r(errno, msg, sizeof(msg)));
- rc = -errno;
+ if (errno)
+ rc = -errno;
+ else
+ rc = -EINVAL;
}
goto out;
}