lkml.org 
[lkml]   [2018]   [Jan]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH net-next] ptr_ring: fix integer overflow
From
From: Jason Wang <jasowang@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+87678bcf753b44c39b67@syzkaller.appspotmail.com
> Cc: John Fastabend <john.fastabend@gmail.com>
> Signed-off-by: Jason Wang <jasowang@redhat.com>

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

Let me know if I still need to apply this.

Thanks.

\
 
 \ /
  Last update: 2018-01-29 18:01    [W:1.402 / U:0.056 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site