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fix regression in "epoll: Keep a reference on files added to the check list"

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[ Upstream commit 77f4689de17c0887775bb77896f4cc11a39bf848 ]

epoll_loop_check_proc() can run into a file already committed to destruction;
we can't grab a reference on those and don't need to add them to the set for
reverse path check anyway.

Tested-by: Marc Zyngier <maz@kernel.org>
Fixes: a9ed4a6560b8 ("epoll: Keep a reference on files added to the check list")
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Al Viro 2020-09-02 11:30:48 -04:00 committed by Greg Kroah-Hartman
parent 901d22c6b6
commit 88405cf0f2
1 changed files with 3 additions and 3 deletions
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6
fs/eventpoll.c
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@ -1992,9 +1992,9 @@ static int ep_loop_check_proc(void *priv, void *cookie, int call_nests)
* during ep_insert().
*/
if (list_empty(&epi->ffd.file->f_tfile_llink)) {
get_file(epi->ffd.file);
list_add(&epi->ffd.file->f_tfile_llink,
&tfile_check_list);
if (get_file_rcu(epi->ffd.file))
list_add(&epi->ffd.file->f_tfile_llink,
&tfile_check_list);
}
}
}