Hello,

syzbot has tested the proposed patch but the reproducer still triggered  
crash:
no output from test machine



Tested on commit bebc6082da0a9f5d47a1ea2edc099bf671058bd4
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/linux-4.14.y
compiler: gcc (GCC) 7.1.1 20170620
Patch is attached.
Kernel config is attached.
Raw console output is attached.