null_blk: fix validation of block size

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[ Upstream commit c462ecd659 ]

Block size should be between 512 and PAGE_SIZE and be a power of 2. The current
check does not validate this, so update the check.

Without this patch, null_blk would Oops due to a null pointer deref when
loaded with bs=1536 [1].

Link: https://lore.kernel.org/all/87wmn8mocd.fsf@metaspace.dk/

Signed-off-by: Andreas Hindborg <a.hindborg@samsung.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20240603192645.977968-1-nmi@metaspace.dk
[axboe: remove unnecessary braces and != 0 check]
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

This commit is contained in:

Andreas Hindborg 2024-06-03 21:26:45 +02:00 • committed by Greg Kroah-Hartman

parent b4eb25a3d7

commit 2772ed2fc0

1 changed files with 2 additions and 2 deletions

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drivers/block/null_blk/main.c

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