kselftests: cgroup: Avoid the reuse of fd after it is deallocated
It is necessary to set fd to -1 when inotify_add_watch() fails in
cg_prepare_for_wait. Otherwise the fd which has been closed in
cg_prepare_for_wait may be misused in other functions such as
cg_enter_and_wait_for_frozen and cg_freeze_wait.
Fixes: 5313bfe425
("selftests: cgroup: add freezer controller self-tests")
Signed-off-by: Hewenliang <hewenliang4@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
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@ -72,6 +72,7 @@ static int cg_prepare_for_wait(const char *cgroup)
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if (ret == -1) {
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debug("Error: inotify_add_watch() failed\n");
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close(fd);
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fd = -1;
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}
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return fd;
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