Messages in this thread | | | Date | Mon, 29 Jan 2018 12:01:24 -0500 (EST) | Subject | Re: [PATCH net-next] ptr_ring: fix integer overflow | From | David Miller <> |
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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.
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