Re: [Linux-NTFS-Dev] [syzbot] kernel BUG in ntfs_read_inode_mount

[Pavel S. <pas...@gm...>]

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: syz...@sy...
> 

__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