Re: [syzbot] [fuse?] KASAN: null-ptr-deref Read in fuse_copy_do

[syzbot]

syzbot has bisected this issue to:

commit 3b97c3652d9128ab7f8c9b8adec6108611fdb153
Author: Joanne Koong <joannelkoong@xxxxxxxxx>
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@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 3b97c3652d91 ("fuse: convert direct io to use folios")

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