[PATCH 3/3] erofs: handle corrupted images whose decompressed size less than it'd be

[Eric Biggers]

On Wed, Feb 26, 2020 at 10:30:11AM +0800, Gao Xiang wrote:
> As Lasse pointed out, "Looking at fs/erofs/decompress.c,
> the return value from LZ4_decompress_safe_partial is only
> checked for negative value to catch errors. ... So if
> I understood it correctly, if there is bad data whose
> uncompressed size is much less than it should be, it can
> leave part of the output buffer untouched and expose the
> previous data as the file content. "
> 
> Let's fix it now.
> 
> Cc: Lasse Collin <lasse.collin at tukaani.org>
> Signed-off-by: Gao Xiang <gaoxiang25 at huawei.com>

Shouldn't fixes like this have a Fixes tag and Cc stable?

- Eric