BUG: unable to handle kernel paging request in cfb_imageblit

[syzbot]

syzbot suspects this issue was fixed by commit:

commit a49145acfb975d921464b84fe00279f99827d816
Author: George Kennedy <george.kennedy at oracle.com>
Date:   Tue Jul 7 19:26:03 2020 +0000

    fbmem: add margin check to fb_check_caps()

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1149f30f500000
start commit:   22fbc037 Merge tag 'for-linus' of git://git.kernel.org/pub..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=4e672827d2ffab1f
dashboard link: https://syzkaller.appspot.com/bug?extid=dfd0b1c6705301cc4847
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11ba9a5d900000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17cfd4af900000

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

#syz fix: fbmem: add margin check to fb_check_caps()

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