From: Andreas Hindborg a.hindborg@samsung.com

stable inclusion from stable-v6.6.42 commit 08f03186b96e25e3154916a2e70732557c770ea7 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IAGEMW CVE: CVE-2024-41077

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...

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[ Upstream commit c462ecd659b5fce731f1d592285832fd6ad54053 ]

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 Signed-off-by: Zeng Heng zengheng4@huawei.com --- drivers/block/null_blk/main.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/block/null_blk/main.c b/drivers/block/null_blk/main.c index c70c1b9caf2f..644f86eef744 100644 --- a/drivers/block/null_blk/main.c +++ b/drivers/block/null_blk/main.c @@ -2029,8 +2029,8 @@ static int null_validate_conf(struct nullb_device *dev) return -EINVAL; }

- dev->blocksize = round_down(dev->blocksize, 512); - dev->blocksize = clamp_t(unsigned int, dev->blocksize, 512, 4096); + if (blk_validate_block_size(dev->blocksize)) + return -EINVAL;

if (dev->queue_mode == NULL_Q_MQ && dev->use_per_node_hctx) { if (dev->submit_queues != nr_online_nodes)