linux-kernel - Re: [PATCH] null_blk: fix use-after-free error

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Date:	Tue, 22 Dec 2015 10:43:08 -0700
From:	Jens Axboe <axboe@...com>
To:	Mike Krinkin <krinkin.m.u@...il.com>
CC:	<avanzini@...gle.com>, <paolo.valente@...more.it>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] null_blk: fix use-after-free error

On 12/15/2015 02:56 AM, Mike Krinkin wrote:
> blk_end_request_all may free request, so we need to save
> request_queue pointer before blk_end_request_all call.
>
> The problem was introduced in commit cf8ecc5a8455266f8d51
> ("null_blk: guarantee device restart in all irq modes")
> and causes general protection fault with slab poisoning
> enabled.
>
> Fixes: cf8ecc5a8455266f8d51 ("null_blk: guarantee device
>         restart in all irq modes")

Added for 4.4, thanks.

-- 
Jens Axboe

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