ublk: remove WARN_ON_ONCE() in ublk_unmap_io()

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io->res is set from struct ublksrv_io_cmd's result field, which is
controlled by the ublk server process, without any validation. It's thus
possible for userspace to trigger the io->res > rq_bytes warning.
ublk_copy_user_pages() already limits the copy length to the request
data length, so drop the warning.

Signed-off-by: Caleb Sander Mateos <csander@purestorage.com>
Link: https://patch.msgid.link/20260729171041.45061-4-csander@purestorage.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Caleb Sander Mateos 2026-07-29 11:10:41 -06:00 • committed by Jens Axboe

parent 24fd370617

commit 15c1339ef4

1 changed files with 0 additions and 2 deletions

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drivers/block/ublk_drv.c

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