linux-kernel - Re: [PATCH v2] erofs: fix null-ptr-deref caused by erofs_xattr_prefixes

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Date:   Tue, 16 May 2023 09:06:40 +0800
From:   Yue Hu <zbestahu@...il.com>
To:     Jingbo Xu <jefflexu@...ux.alibaba.com>
Cc:     xiang@...nel.org, chao@...nel.org, linux-erofs@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org, huyue2@...lpad.com,
        zhangwen@...lpad.com
Subject: Re: [PATCH v2] erofs: fix null-ptr-deref caused by
 erofs_xattr_prefixes_init

On Mon, 15 May 2023 18:39:41 +0800
Jingbo Xu <jefflexu@...ux.alibaba.com> wrote:

> Fragments and dedupe share one feature bit, and thus packed inode may not
> exist when fragment feature bit (dedupe feature bit exactly) is set, e.g.
> when deduplication feature is in use while fragments feature is not.  In
> this case, sbi->packed_inode could be NULL while fragments feature bit
> is set.
> 
> Fix this by accessing packed inode only when it exists.
> 
> Reported-by: syzbot+902d5a9373ae8f748a94@...kaller.appspotmail.com
> Link: https://syzkaller.appspot.com/bug?extid=902d5a9373ae8f748a94
> Fixes: 9e382914617c ("erofs: add helpers to load long xattr name prefixes")
> Signed-off-by: Jingbo Xu <jefflexu@...ux.alibaba.com>

Reviewed-by: Yue Hu <huyue2@...lpad.com>