linux-kernel - Re: [syzbot] [fuse?] KASAN: null-ptr-deref Read in fuse_copy

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Message-ID: <67496673.050a0220.253251.00a4.GAE@google.com>
Date: Thu, 28 Nov 2024 23:00:03 -0800
From: syzbot <syzbot+87b8e6ed25dbc41759f7@...kaller.appspotmail.com>
To: joannelkoong@...il.com, josef@...icpanda.com, 
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, 
	miklos@...redi.hu, mszeredi@...hat.com, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [fuse?] KASAN: null-ptr-deref Read in fuse_copy_do

syzbot has bisected this issue to:

commit 3b97c3652d9128ab7f8c9b8adec6108611fdb153
Author: Joanne Koong <joannelkoong@...il.com>
Date:   Thu Oct 24 17:18:08 2024 +0000

    fuse: convert direct io to use folios

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1648df5f980000
start commit:   445d9f05fa14 Merge tag 'nfsd-6.13' of git://git.kernel.org..
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=1548df5f980000
console output: https://syzkaller.appspot.com/x/log.txt?x=1148df5f980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=3c44a32edb32752c
dashboard link: https://syzkaller.appspot.com/bug?extid=87b8e6ed25dbc41759f7
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11fd43c0580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15cf2f5f980000

Reported-by: syzbot+87b8e6ed25dbc41759f7@...kaller.appspotmail.com
Fixes: 3b97c3652d91 ("fuse: convert direct io to use folios")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection