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Date:   Thu, 20 Aug 2020 11:42:11 +0200
From:   David Sterba <dsterba@suse.cz>
To:     Qu Wenruo <quwenruo.btrfs@gmx.com>
Cc:     Daniel Martinez <danielsmartinez@gmail.com>,
        linux-btrfs@vger.kernel.org
Subject: Re: BUG: kernel NULL pointer dereference when using zstd
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On Thu, Aug 20, 2020 at 07:31:15AM +0800, Qu Wenruo wrote:
> 
> 
> On 2020/8/20 上午7:14, Daniel Martinez wrote:
> > Hello,
> > 
> > I have encountered a bug when using zstd compression (I assume that's
> > what caused it, but I could be wrong) on the Debian kernel 5.7.10-1.
> 
> It's not zstd I guess, but a generic compression bug.
> 
> It's fixed by the upstream commit 1e6e238c3002 ("btrfs: inode: fix NULL
> pointer dereference if inode doesn't need compression").
> 
> It's not yet merged into v5.7.y stable branch, I guess I need to
> backport it manually then.

The commit is in 5.4, 5.7 and 5.8 queue, so the next stable release will
have it.