[PATCH] erofs: fix out-of-bound read for shifted uncompressed block

[Chao Yu]

On 2020/1/7 10:25, Gao Xiang wrote:
> rq->out[1] should be valid before accessing. Otherwise,
> in very rare cases, out-of-bound dirty onstack rq->out[1]
> can equal to *in and lead to unintended memmove behavior.
> 
> Fixes: 7fc45dbc938a ("staging: erofs: introduce generic decompression backend")
> Cc: <stable at vger.kernel.org> # v5.3+
> Signed-off-by: Gao Xiang <gaoxiang25 at huawei.com>

Reviewed-by: Chao Yu <yuchao0 at huawei.com>

Thanks,