ipv6: sr: clear IP6CB(skb) on SRH ip4ip6 encapsulation

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[ Upstream commit ef489749aa ]

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: 32d99d0b67 ("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>

...

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Yohei Kanemaru 2019-01-29 15:52:34 +09:00 • committed by Greg Kroah-Hartman

parent cedc04f508

commit b71b7e0280

1 changed files with 2 additions and 0 deletions

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net/ipv6/seg6_iptunnel.c

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