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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <161736a2-1a79-b30a-002c-61ef9c237a22@kernel.org>
Date:   Tue, 23 May 2023 14:25:20 +0800
From:   Chao Yu <chao@...nel.org>
To:     Jingbo Xu <jefflexu@...ux.alibaba.com>, xiang@...nel.org,
        huyue2@...lpad.com, linux-erofs@...ts.ozlabs.org
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] erofs: fix null-ptr-deref caused by
 erofs_xattr_prefixes_init

On 2023/5/15 18:39, Jingbo Xu 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: Chao Yu <chao@...nel.org>

Thanks,