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SubjectRe: BUG: unable to handle kernel NULL pointer dereference in __lookup_slow
From
syzbot suspects this issue was fixed by commit:

commit d24396c5290ba8ab04ba505176874c4e04a2d53c
Author: Rustam Kovhaev <rkovhaev@gmail.com>
Date: Sun Nov 1 14:09:58 2020 +0000

reiserfs: add check for an invalid ih_entry_count

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=111480e7500000
start commit: a68a0262 mm/madvise: remove racy mm ownership check
git tree: upstream
kernel config: https://syzkaller.appspot.com/x/.config?x=e597c2b53c984cd8
dashboard link: https://syzkaller.appspot.com/bug?extid=3db80bbf66b88d68af9d
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1737b8a7500000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1697246b500000

If the result looks correct, please mark the issue as fixed by replying with:

#syz fix: reiserfs: add check for an invalid ih_entry_count

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

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