diff options
| author | Jens Axboe <axboe@kernel.dk> | 2019-11-13 16:12:46 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2019-11-13 16:15:14 -0700 |
| commit | 5e559561a8d7e6d4adfce6aa8fbf3daa3dec1577 (patch) | |
| tree | e517c845a7d4e0014be9cd13e7c1404dafec361e /fs/io_uring.c | |
| parent | 5683e5406e94ae1bfb0d9516a18fdb281d0f8d1d (diff) | |
io_uring: ensure registered buffer import returns the IO length
A test case was reported where two linked reads with registered buffers
failed the second link always. This is because we set the expected value
of a request in req->result, and if we don't get this result, then we
fail the dependent links. For some reason the registered buffer import
returned -ERROR/0, while the normal import returns -ERROR/length. This
broke linked commands with registered buffers.
Fix this by making io_import_fixed() correctly return the mapped length.
Cc: stable@vger.kernel.org # v5.3
Reported-by: 李通洲 <carter.li@eoitek.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'fs/io_uring.c')
| -rw-r--r-- | fs/io_uring.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/io_uring.c b/fs/io_uring.c index 57ea54d5b0fb..2c819c3c855d 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -1230,7 +1230,7 @@ static int io_import_fixed(struct io_ring_ctx *ctx, int rw, } } - return 0; + return len; } static ssize_t io_import_iovec(struct io_ring_ctx *ctx, int rw, |