linux-kernel - Re: [PATCH] blk-mq: fix use-after-free in blk_mq_free_tag

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Date:	Thu, 15 Oct 2015 14:47:02 +0000 (UTC)
From:	Keith Busch <keith.busch@...el.com>
To:	Junichi Nomura <j-nomura@...jp.nec.com>
cc:	Jens Axboe <axboe@...nel.dk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Keith Busch <keith.busch@...el.com>,
	"axboe@...com" <axboe@...com>
Subject: Re: [PATCH] blk-mq: fix use-after-free in blk_mq_free_tag_set()

On Tue, 13 Oct 2015, Junichi Nomura wrote:
> tags is freed in blk_mq_free_rq_map() and should not be used after that.
> The problem doesn't manifest if CONFIG_CPUMASK_OFFSTACK is false because
> free_cpumask_var() is nop.
>
> tags->cpumask is allocated in blk_mq_init_tags() so it's natural to
> free cpumask in its counter part, blk_mq_free_tags().

Thanks for the fix.

Reviewed-by: Keith Busch <keith.busch@...el.com>

> Fixes: f26cdc8536ad ("blk-mq: Shared tag enhancements")
> Signed-off-by: Jun'ichi Nomura <j-nomura@...jp.nec.com>
> Cc: Keith Busch <keith.busch@...el.com>
> Cc: Jens Axboe <axboe@...com>
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