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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:   Thu, 31 Mar 2022 21:46:21 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Jiasheng Jiang <jiasheng@...as.ac.cn>
Cc:     hch@...radead.org, 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, Apr 01, 2022 at 11:37:55AM +0800, Jiasheng Jiang wrote:
> >> 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.

Please take a look at the implemetation and documentation of
mempool_alloc again.  Thewhole point of that function is that it will
not fail for allocations that can sleep.