Re: [PATCH] fs: xfs: fix possible NULL pointer dereference in xfs_rw_bdev()

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Subject: Re: [PATCH] fs: xfs: fix possible NULL pointer dereference in xfs_rw_bdev()
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Mon, 11 Apr 2022 07:55:12 -0700
Cc: djwong@xxxxxxxxxx, linux-xfs@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, baijiaju1990@xxxxxxxxx, TOTE Robot <oslab@xxxxxxxxxxxxxxx>
In-reply-to: <20220411113145.797121-1-r33s3n6@gmail.com>
References: <20220411113145.797121-1-r33s3n6@gmail.com>

On Mon, Apr 11, 2022 at 07:31:45PM +0800, Zixuan Fu wrote:
> In our fault-injection testing, bio_alloc() may fail with low memory and
> return NULL.

Well, in that case your fault injection seems to be completely broken.
Please take a closer look at how bio_alloc is implemented and
documented.

References:
- [PATCH] fs: xfs: fix possible NULL pointer dereference in xfs_rw_bdev()
  - From: Zixuan Fu

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