io_uring: fix off-by one bvec index

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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>

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Keith Busch 2023-11-20 14:18:31 -08:00 • committed by Greg Kroah-Hartman

parent 2214e2bb54

commit 9ab2b08473

1 changed files with 1 additions and 1 deletions

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io_uring/rsrc.c

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