ublk: check import_ubuf() return value

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import_ubuf() can fail if the address range (provided by the userspace
ublk server) is outside the allowed user address space. Return that 0
bytes were copied if import_ubuf() fails rather than passing an
uninitialized struct iov_iter to ublk_copy_user_pages().

Fixes: 981f95a571 ("ublk: cleanup ublk_copy_user_pages")
Reported-by: Ming Lei <tom.leiming@gmail.com>
Signed-off-by: Caleb Sander Mateos <csander@purestorage.com>
Link: https://patch.msgid.link/20260729171041.45061-2-csander@purestorage.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Caleb Sander Mateos 2026-07-29 11:10:39 -06:00 • committed by Jens Axboe

parent cbe81d6120

commit 3831568792

1 changed files with 8 additions and 2 deletions

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drivers/block/ublk_drv.c

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