linux-kernel - [PATCH AUTOSEL 5.15 19/21] null_blk: fix validation of block size

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Message-ID: <20240617132617.2589631-19-sashal@kernel.org>
Date: Mon, 17 Jun 2024 09:25:56 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Andreas Hindborg <a.hindborg@...sung.com>,
	Ming Lei <ming.lei@...hat.com>,
	Jens Axboe <axboe@...nel.dk>,
	Sasha Levin <sashal@...nel.org>,
	dlemoal@...nel.org,
	hare@...e.de,
	kch@...dia.com,
	johannes.thumshirn@....com,
	zhouchengming@...edance.com,
	yanjun.zhu@...ux.dev,
	yukuai3@...wei.com,
	shinichiro.kawasaki@....com,
	linux-block@...r.kernel.org
Subject: [PATCH AUTOSEL 5.15 19/21] null_blk: fix validation of block size

From: Andreas Hindborg <a.hindborg@...sung.com>

[ 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@...sung.com>
Reviewed-by: Ming Lei <ming.lei@...hat.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@...nel.dk>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 87791265e09bf..ad0172f3fd4da 100644
--- a/drivers/block/null_blk/main.c
+++ b/drivers/block/null_blk/main.c
@@ -1749,8 +1749,8 @@ 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)
-- 
2.43.0