ublk: check for ublk_unmap_io() returning 0

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If the userspace ublk server passes an unmapped address as the data
buffer for a completed ublk read, ublk_unmap_io() will return 0
indicating no bytes could be copied. Currently, this will result in
calling blk_update_request() with nr_bytes=0, which doesn't seem
supported. Fail the I/O with BLK_STS_IOERR in this case instead.

Fixes: 71f28f3136 ("ublk_drv: add io_uring based userspace block driver")
Signed-off-by: Caleb Sander Mateos <csander@purestorage.com>
Link: https://patch.msgid.link/20260729171041.45061-3-csander@purestorage.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Caleb Sander Mateos 2026-07-29 11:10:40 -06:00 • committed by Jens Axboe

parent 3831568792

commit 24fd370617

1 changed files with 7 additions and 1 deletions

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drivers/block/ublk_drv.c

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