linux-kernel - [syzbot] [ntfs?] UBSAN: shift-out-of-bounds in ntfs

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Message-ID: <913c36b5-f651-c728-7322-fe648d614a66@gmail.com>
Date:   Sat, 5 Aug 2023 10:27:09 +0530
From:   Manas Ghandat <ghandatmanas@...il.com>
To:     "syzbot+4768a8f039aa677897d0@...kaller.appspotmail.com" 
        <syzbot+4768a8f039aa677897d0@...kaller.appspotmail.com>
Cc:     anton@...era.com, linkinjeon@...nel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-ntfs-dev@...ts.sourceforge.net,
        syzkaller-bugs@...glegroups.com
Subject: [syzbot] [ntfs?] UBSAN: shift-out-of-bounds in ntfs_iget

In this bug, the logic at the following line 
(https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/fs/ntfs/inode.c?id=e8f75c0270d930ef675fee22d74d1a3250e96962#n1067) 
is getting skipped. The `if` condition is not triggered and thus the 
compression issue occurs. I was trying to change the `if` conditions so 
that the check occurs but was getting the following error. Can you 
suggest any way so that the condition gets triggered.

Thanks,
Manas

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