Re: [CHECKER] free bugs in 2.4.4 and 2.4.4-ac8

David S. Miller (davem@redhat.com)
Thu, 24 May 2001 16:17:55 -0700 (PDT)

Alan Cox writes:
> > [BUG] seems possible --- or is some precondition guarenteed?
> > /u2/engler/mc/oses/linux/2.4.4-ac8/net/ipv6/udp.c:438:udpv6_recvmsg: ERROR:FREE:453:438: WARN: Use-after-free of "skb"! set by 'kfree_skb':453
>
> Looks right. Left for DaveM

It's wrong, in the MSG_PEEK case skb->users is incremented by
skb_recv_datagram, so to truly get rid of it we do indeed need to
unlink it from the receive_queue then free it twice :-)

Later,
David S. Miller
davem@redhat.com
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