linux-kernel - Re: [syzbot] general protection fault in ntfs_update

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Message-ID: <83061bda-5a91-6123-a006-aaeb5458d5d7@gmail.com>
Date:   Thu, 21 Apr 2022 23:26:05 +0300
From:   Pavel Skripkin <paskripkin@...il.com>
To:     syzbot <syzbot+c95173762127ad76a824@...kaller.appspotmail.com>,
        almaz.alexandrovich@...agon-software.com,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
        nathan@...nel.org, ndesaulniers@...gle.com, ntfs3@...ts.linux.dev,
        syzkaller-bugs@...glegroups.com, trix@...hat.com
Subject: Re: [syzbot] general protection fault in ntfs_update_mftmirr

On 4/21/22 11:17, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    b253435746d9 Merge tag 'xtensa-20220416' of https://github..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=11588ba2f00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=4cdc9619f45633df
> dashboard link: https://syzkaller.appspot.com/bug?extid=c95173762127ad76a824
> compiler:       Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=175b13c0f00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1502f854f00000
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+c95173762127ad76a824@...kaller.appspotmail.com
> 

If ntfs_fill_super wasn't called then sbi->sb is NULL.

#syz test:
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master





With regards,
Pavel Skripkin

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