syzbot suspects this issue was fixed by commit:
commit 874a52f9b693ed8bf7a92b3592a547ce8a684e6f
Author: Tong Zhang <ztong0001@xxxxxxxxx>
Date: Sun Feb 28 04:46:25 2021 +0000
drm/fb-helper: only unmap if buffer not null
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=10c27b7ed00000
start commit: c03c21ba Merge tag 'keys-misc-20210126' of git://git.kerne..
git tree: upstream
kernel config: https://syzkaller.appspot.com/x/.config?x=ec4c85e44cc3172e
dashboard link: https://syzkaller.appspot.com/bug?extid=10328e8428a896b65119
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12d95d7ad00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=148da9ccd00000
If the result looks correct, please mark the issue as fixed by replying with:
#syz fix: drm/fb-helper: only unmap if buffer not null
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
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