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

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Date:   Fri,  1 Apr 2022 11:37:55 +0800
From:   Jiasheng Jiang <jiasheng@...as.ac.cn>
To:     hch@...radead.org
Cc:     rpeterso@...hat.com, agruenba@...hat.com, cluster-devel@...hat.com,
        linux-kernel@...r.kernel.org, Jiasheng Jiang <jiasheng@...as.ac.cn>
Subject: Re: [Cluster-devel] [PATCH] gfs2: Add check for mempool_alloc

On Wed, 30 Mar 2022 11:56:41 +0800 Christoph Hellwig 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.

I think that for safety, the cost of redundant and harmless
check is acceptable.
Also, checking after allocation is a good program pattern.
Therefore, it should be better to check it although it is
hard to fail.

Thanks,
Jiang