| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.15 166/171] aio: Fix incorrect usage of eventfd_signal_allowed() | Date | Mon, 13 Dec 2021 10:31:21 +0100 |
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From: Xie Yongji <xieyongji@bytedance.com>
commit 4b3749865374899e115aa8c48681709b086fe6d3 upstream.
We should defer eventfd_signal() to the workqueue when eventfd_signal_allowed() return false rather than return true.
Fixes: b542e383d8c0 ("eventfd: Make signal recursion protection a task bit") Signed-off-by: Xie Yongji <xieyongji@bytedance.com> Link: https://lore.kernel.org/r/20210913111928.98-1-xieyongji@bytedance.com Reviewed-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- fs/aio.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/fs/aio.c +++ b/fs/aio.c @@ -1761,7 +1761,7 @@ static int aio_poll_wake(struct wait_que list_del_init(&req->wait.entry); list_del(&iocb->ki_list); iocb->ki_res.res = mangle_poll(mask); - if (iocb->ki_eventfd && eventfd_signal_allowed()) { + if (iocb->ki_eventfd && !eventfd_signal_allowed()) { iocb = NULL; INIT_WORK(&req->work, aio_poll_put_work); schedule_work(&req->work);
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