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| author | Yohei Kanemaru <yohei.kanemaru@gmail.com> | 2019-01-29 15:52:34 +0900 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-02-06 17:27:35 +0100 |
| commit | b71b7e0280f47b4ac633fbfd153423814ea87810 (patch) | |
| tree | 155c125609977d9c74bb0c3a9f9fef6e24900ed1 /net | |
| parent | cedc04f5082c8507c6210b8971befd7ffe6cf25c (diff) | |
| download | linux-b71b7e0280f47b4ac633fbfd153423814ea87810.tar.gz linux-b71b7e0280f47b4ac633fbfd153423814ea87810.tar.bz2 linux-b71b7e0280f47b4ac633fbfd153423814ea87810.zip | |
ipv6: sr: clear IP6CB(skb) on SRH ip4ip6 encapsulation
[ Upstream commit ef489749aae508e6f17886775c075f12ff919fb1 ]
skb->cb may contain data from previous layers (in an observed case
IPv4 with L3 Master Device). In the observed scenario, the data in
IPCB(skb)->frags was misinterpreted as IP6CB(skb)->frag_max_size,
eventually caused an unexpected IPv6 fragmentation in ip6_fragment()
through ip6_finish_output().
This patch clears IP6CB(skb), which potentially contains garbage data,
on the SRH ip4ip6 encapsulation.
Fixes: 32d99d0b6702 ("ipv6: sr: add support for ip4ip6 encapsulation")
Signed-off-by: Yohei Kanemaru <yohei.kanemaru@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv6/seg6_iptunnel.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/net/ipv6/seg6_iptunnel.c b/net/ipv6/seg6_iptunnel.c index 8181ee7e1e27..ee5403cbe655 100644 --- a/net/ipv6/seg6_iptunnel.c +++ b/net/ipv6/seg6_iptunnel.c @@ -146,6 +146,8 @@ int seg6_do_srh_encap(struct sk_buff *skb, struct ipv6_sr_hdr *osrh, int proto) } else { ip6_flow_hdr(hdr, 0, flowlabel); hdr->hop_limit = ip6_dst_hoplimit(skb_dst(skb)); + + memset(IP6CB(skb), 0, sizeof(*IP6CB(skb))); } hdr->nexthdr = NEXTHDR_ROUTING; |