Re: [GIT PULL] Btrfs changes for 4.15

[David Sterba]

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.