From 9c3a205c5ffa36e96903c2e37eb5f41c0f03c43e Mon Sep 17 00:00:00 2001
From: Pavel Begunkov <asml.silence@gmail.com>
Date: Mon, 23 Nov 2020 23:20:27 +0000
Subject: [PATCH] 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: ff6165b2d7f6 ("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>
---
fs/io_uring.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index f971589878bc2..ff6deffe5aa93 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -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;
--
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