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authorJason A. Donenfeld <Jason@zx2c4.com>2016-10-21 18:28:25 +0900
committerDavid S. Miller <davem@davemloft.net>2016-10-23 17:38:58 -0400
commitb678aa578c9e400429e027269e8de2783e5e73ce (patch)
treec1dd6a3119b327b4cdf94aed4feadee7721d5a79
parenta6e2846cacf97d4c70c5e923325b015cfa1e9053 (diff)
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ipv6: do not increment mac header when it's unset
Otherwise we'll overflow the integer. This occurs when layer 3 tunneled packets are handed off to the IPv6 layer. Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/ipv6/reassembly.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/net/ipv6/reassembly.c b/net/ipv6/reassembly.c
index 2160d5d009cb..3815e8505ed2 100644
--- a/net/ipv6/reassembly.c
+++ b/net/ipv6/reassembly.c
@@ -456,7 +456,8 @@ static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *prev,
skb_network_header(head)[nhoff] = skb_transport_header(head)[0];
memmove(head->head + sizeof(struct frag_hdr), head->head,
(head->data - head->head) - sizeof(struct frag_hdr));
- head->mac_header += sizeof(struct frag_hdr);
+ if (skb_mac_header_was_set(head))
+ head->mac_header += sizeof(struct frag_hdr);
head->network_header += sizeof(struct frag_hdr);
skb_reset_transport_header(head);