KASAN: use-after-free Write in snd_rawmidi_kernel_write1

[Greg Kroah-Hartman]

On Thu, May 07, 2020 at 04:04:25PM +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.

Great, care to create a fix for this and send it to the proper
maintainers?  That's the best way to get it fixed, otherwise it just
goes in the file with the rest of the syzbot reports we are burried
under.

thanks,

greg k-h