linux-kernel - Re: [PATCH] block: fix overflow in blk_ioctl

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Date: Tue, 2 Apr 2024 14:32:45 +0200
From: Christoph Hellwig <hch@....de>
To: linan666@...weicloud.com
Cc: axboe@...nel.dk, hch@....de, linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org, yukuai3@...wei.com,
	yi.zhang@...wei.com, houtao1@...wei.com, yangerkun@...wei.com
Subject: Re: [PATCH] block: fix overflow in blk_ioctl_discard()

On Fri, Mar 29, 2024 at 09:23:19AM +0800, linan666@...weicloud.com wrote:
> From: Li Nan <linan122@...wei.com>
> 
> There is no check for overflow of 'start + len' in blk_ioctl_discard().
> Hung task occurs if submit an discard ioctl with the following param:
>   start = 0x80000000000ff000, len = 0x8000000000fff000;
> Add the overflow validation now.

Looks good:

Reviewed-by: Christoph Hellwig <hch@....de>

Can you wire up a testcase in blktests for this condition?