Re: KASAN: use-after-free Read in ucma_close (2)

[Jason Gunthorpe]

On Thu, Sep 10, 2020 at 07:09:24AM -0700, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    34d4ddd3 Merge tag 'linux-kselftest-5.9-rc5' of git://git...
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=1002ea2d900000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=a9075b36a6ae26c9
> dashboard link: https://syzkaller.appspot.com/bug?extid=cc6fc752b3819e082d0c
> compiler:       gcc (GCC) 10.1.0-syz 20200507
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1600e053900000
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+cc6fc752b3819e082d0c@xxxxxxxxxxxxxxxxxxxxxxxxx

#syz test: https://github.com/jgunthorpe/linux ucma_migrate_fix

Jason