linux-kernel - Re: [syzbot] kernel BUG in ntfs_read_inode

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Date:   Mon, 17 Jan 2022 22:02:15 +0300
From:   Pavel Skripkin <paskripkin@...il.com>
To:     syzbot <syzbot+3c765c5248797356edaa@...kaller.appspotmail.com>,
        anton@...era.com, linux-kernel@...r.kernel.org,
        linux-ntfs-dev@...ts.sourceforge.net,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] kernel BUG in ntfs_read_inode_mount

On 1/17/22 13:09, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    d0a231f01e5b Merge tag 'pci-v5.17-changes' of git://git.ke..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=11f83837b00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=986ed422f1741853
> dashboard link: https://syzkaller.appspot.com/bug?extid=3c765c5248797356edaa
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> 
> Unfortunately, I don't have any reproducer for this issue yet.
> 

Sad :(

> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+3c765c5248797356edaa@...kaller.appspotmail.com
> 

__ntfs_malloc() calls BUG_ON() in case of requested size is equal to 
zero. Seems like syzbot has once again crafted malicious fs image that 
has attr_list_size == 0

Just for thoughts


With regards,
Pavel Skripkin