Re: [PATCH net-next] ptr_ring: fix integer overflow

[Jason Wang]

On 2018年01月30日 01:01, David Miller wrote:

From: Jason Wang <jasow...@redhat.com>
Date: Thu, 25 Jan 2018 15:31:42 +0800

We try to allocate one more entry for lockless peeking. The adding
operation may overflow which causes zero to be passed to kmalloc().
In this case, it returns ZERO_SIZE_PTR without any notice by ptr
ring. Try to do producing or consuming on such ring will lead NULL
dereference. Fix this detect and fail early.

Fixes: bcecb4bbf88a ("net: ptr_ring: otherwise safe empty checks can overrun array 
bounds")
Reported-by: syzbot+87678bcf753b44c39...@syzkaller.appspotmail.com
Cc: John Fastabend <john.fastab...@gmail.com>
Signed-off-by: Jason Wang <jasow...@redhat.com>

I'm dropping this because I am to understand that Michael Tsirkin's patch
series covers this issue.

Yes.

Let me know if I still need to apply this.

Thanks.

No need for this.

Thanks