From: Patrick McHardy Date: Tue, 9 Jan 2007 22:32:41 +0000 (-0800) Subject: [NETFILTER]: nf_conntrack_ipv6: fix crash when handling fragments X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=f9f02cca25acf33e5853c6b3cbb0c7146312783f;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git [NETFILTER]: nf_conntrack_ipv6: fix crash when handling fragments When IPv6 connection tracking splits up a defragmented packet into its original fragments, the packets are taken from a list and are passed to the network stack with skb->next still set. This causes dev_hard_start_xmit to treat them as GSO fragments, resulting in a use after free when connection tracking handles the next fragment. Signed-off-by: Patrick McHardy Signed-off-by: David S. Miller --- diff --git a/net/ipv6/netfilter/nf_conntrack_reasm.c b/net/ipv6/netfilter/nf_conntrack_reasm.c index 37e5fca923aa..d9c15402ba66 100644 --- a/net/ipv6/netfilter/nf_conntrack_reasm.c +++ b/net/ipv6/netfilter/nf_conntrack_reasm.c @@ -835,6 +835,8 @@ void nf_ct_frag6_output(unsigned int hooknum, struct sk_buff *skb, s->nfct_reasm = skb; s2 = s->next; + s->next = NULL; + NF_HOOK_THRESH(PF_INET6, hooknum, s, in, out, okfn, NF_IP6_PRI_CONNTRACK_DEFRAG + 1); s = s2;