linux-kernel - Re: [GIT PULL] Btrfs changes for 4.15

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Date:   Tue, 14 Nov 2017 15:50:26 +0100
From:   David Sterba <dsterba@...e.cz>
To:     Qu Wenruo <quwenruo.btrfs@....com>
Cc:     David Sterba <dsterba@...e.com>, torvalds@...ux-foundation.org,
        clm@...com, linux-btrfs@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [GIT PULL] Btrfs changes for 4.15

On Tue, Nov 14, 2017 at 07:39:11AM +0800, Qu Wenruo wrote:
> > - extend mount options to specify zlib compression level, -o compress=zlib:9
> 
> However the support for it has a big problem, it will cause wild memory
> access for "-o compress" mount option.
> 
> Kernel ASAN can detect it easily and we already have user report about
> it. Btrfs/026 could also easily trigger it.
> 
> The fixing patch is submitted some days ago:
> https://patchwork.kernel.org/patch/10042553/
> 
> And the default compression level when not specified is zero, which
> means no compression but directly memory copy.

This fix will go in next pull request. Thanks.