linux-kernel - Re: [Cluster-devel] [PATCH] gfs2: Add check for mempool

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Date:   Wed, 30 Mar 2022 08:56:41 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Jiasheng Jiang <jiasheng@...as.ac.cn>
Cc:     rpeterso@...hat.com, agruenba@...hat.com, cluster-devel@...hat.com,
        linux-kernel@...r.kernel.org
Subject: Re: [Cluster-devel] [PATCH] gfs2: Add check for mempool_alloc

On Fri, Mar 11, 2022 at 04:36:16PM +0800, Jiasheng Jiang wrote:
> As the potential failure of mempool_alloc(),
> it could return NULL pointer.
> Therefore, it should be better to check it
> in order to avoid the dereference of the NULL
> pointer.
> 
> Fixes: e8c92ed76900 ("GFS2: Clean up log write code path")
> Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>

Please explain how it could fail to start with.