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io_uring: fix ITER_BVEC check 

iov_iter::type is a bitmask that also keeps direction etc., so it
shouldn't be directly compared against ITER_*. Use proper helper.

Fixes: ff6165b2d7 ("io_uring: retain iov_iter state over io_read/io_write calls")
Reported-by: David Howells <dhowells@redhat.com>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Cc: <stable@vger.kernel.org> # 5.9
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2020-11-23 23:20:27 +00:00 committed by Jens Axboe
parent eb2667b343
commit 9c3a205c5f
1 changed files with 1 additions and 1 deletions
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2
fs/io_uring.c
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@ -3193,7 +3193,7 @@ static void io_req_map_rw(struct io_kiocb *req, const struct iovec *iovec,
rw->free_iovec = iovec;
rw->bytes_done = 0;
/* can only be fixed buffers, no need to do anything */
if (iter->type == ITER_BVEC)
if (iov_iter_is_bvec(iter))
return;
if (!iovec) {
unsigned iov_off = 0;