KASAN: use-after-free Write in snd_rawmidi_kernel_write1

[Greg Kroah-Hartman]

On Thu, May 07, 2020 at 03:54:34PM +0800, butt3rflyh4ck wrote:
> I report a bug (in linux-5.7-rc1) found by syzkaller.
> 
> kernel config:
> https://github.com/butterflyhack/syzkaller-fuzz/blob/master/v5.7.0-rc1.config
> reproducer:
> https://github.com/butterflyhack/syzkaller-fuzz/blob/master/repro.cprog
> 
> I test the reproducer in linux-5.7-rc4 and crash too.

Same as the other email, patches are best, thansk!

greg k-h