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io_uring: fix off-by one bvec index 

commit d6fef34ee4 upstream.

If the offset equals the bv_len of the first registered bvec, then the
request does not include any of that first bvec. Skip it so that drivers
don't have to deal with a zero length bvec, which was observed to break
NVMe's PRP list creation.

Cc: stable@vger.kernel.org
Fixes: bd11b3a391 ("io_uring: don't use iov_iter_advance() for fixed buffers")
Signed-off-by: Keith Busch <kbusch@kernel.org>
Link: https://lore.kernel.org/r/20231120221831.2646460-1-kbusch@meta.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Keith Busch 2023-11-20 14:18:31 -08:00 committed by Greg Kroah-Hartman
parent 49ae2e4e8e
commit 313a34d1c0
1 changed files with 1 additions and 1 deletions
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2
io_uring/io_uring.c
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@ -3152,7 +3152,7 @@ static int __io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter
*/
const struct bio_vec *bvec = imu->bvec;
if (offset <= bvec->bv_len) {
if (offset < bvec->bv_len) {
iov_iter_advance(iter, offset);
} else {
unsigned long seg_skip;