From: Jens Axboe <axboe@kernel.dk>
To: ming.lei@redhat.com, Yu Kuai <yukuai1@huaweicloud.com>,
john.garry@huawei.com, hare@suse.de
Cc: linux-block@vger.kernel.org, yukuai3@huawei.com,
linux-kernel@vger.kernel.org, yi.zhang@huawei.com
Subject: Re: [PATCH v2] blk-mq: fix null pointer dereference in blk_mq_clear_rq_mapping()
Date: Sun, 16 Oct 2022 17:23:01 -0600 [thread overview]
Message-ID: <166596258175.7979.3302811091883290568.b4-ty@kernel.dk> (raw)
In-Reply-To: <20221011142253.4015966-1-yukuai1@huaweicloud.com>
On Tue, 11 Oct 2022 22:22:53 +0800, Yu Kuai wrote:
> From: Yu Kuai <yukuai3@huawei.com>
>
> Our syzkaller report a null pointer dereference, root cause is
> following:
>
> __blk_mq_alloc_map_and_rqs
> set->tags[hctx_idx] = blk_mq_alloc_map_and_rqs
> blk_mq_alloc_map_and_rqs
> blk_mq_alloc_rqs
> // failed due to oom
> alloc_pages_node
> // set->tags[hctx_idx] is still NULL
> blk_mq_free_rqs
> drv_tags = set->tags[hctx_idx];
> // null pointer dereference is triggered
> blk_mq_clear_rq_mapping(drv_tags, ...)
>
> [...]
Applied, thanks!
[1/1] blk-mq: fix null pointer dereference in blk_mq_clear_rq_mapping()
commit: 76dd298094f484c6250ebd076fa53287477b2328
Best regards,
--
Jens Axboe
prev parent reply other threads:[~2022-10-16 23:23 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-11 14:22 Yu Kuai
2022-10-15 3:58 ` Yu Kuai
2022-10-16 23:23 ` Jens Axboe [this message]
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