linux-kernel - Re: [PATCH] blk-mq: fix null-ptr-deref in blk_mq_free

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Message-Id: <175861299450.153465.2022974135907413149.b4-ty@kernel.dk>
Date: Tue, 23 Sep 2025 01:36:34 -0600
From: Jens Axboe <axboe@...nel.dk>
To: martin.petersen@...cle.com, hare@...e.de, ming.lei@...hat.com, 
 Yu Kuai <yukuai1@...weicloud.com>
Cc: linux-block@...r.kernel.org, linux-kernel@...r.kernel.org, 
 yukuai3@...wei.com, yi.zhang@...wei.com, yangerkun@...wei.com, 
 johnny.chenyi@...wei.com
Subject: Re: [PATCH] blk-mq: fix null-ptr-deref in blk_mq_free_tags() from
 error path


On Tue, 23 Sep 2025 15:01:01 +0800, Yu Kuai wrote:
> blk_mq_free_tags() can be called after blk_mq_init_tags(), while
> tags->page_list is still not initialized, causing null-ptr-deref.
> 
> Fix this problem by initializing tags->page_list at blk_mq_init_tags(),
> meanwhile, also free tags directly from error path because there is no
> srcu barrier.
> 
> [...]

Applied, thanks!

[1/1] blk-mq: fix null-ptr-deref in blk_mq_free_tags() from error path
      commit: 670bfe683850cb29957a9d71f997e9774eb24de6

Best regards,
-- 
Jens Axboe