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authorEric Dumazet <edumazet@google.com>2016-10-24 04:03:06 +0300
committerDavid S. Miller <davem@davemloft.net>2016-10-27 00:33:22 +0300
commit10df8e6152c6c400a563a673e9956320bfce1871 (patch)
tree364d982c791875093f8b1cf2f6227c6e471dcf11 /net/ipv6/udp.c
parentecc515d7238f2cffac839069d56dc271141defa0 (diff)
downloadlinux-10df8e6152c6c400a563a673e9956320bfce1871.tar.xz
udp: fix IP_CHECKSUM handling
First bug was added in commit ad6f939ab193 ("ip: Add offset parameter to ip_cmsg_recv") : Tom missed that ipv4 udp messages could be received on AF_INET6 socket. ip_cmsg_recv(msg, skb) should have been replaced by ip_cmsg_recv_offset(msg, skb, sizeof(struct udphdr)); Then commit e6afc8ace6dd ("udp: remove headers from UDP packets before queueing") forgot to adjust the offsets now UDP headers are pulled before skb are put in receive queue. Fixes: ad6f939ab193 ("ip: Add offset parameter to ip_cmsg_recv") Fixes: e6afc8ace6dd ("udp: remove headers from UDP packets before queueing") Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Sam Kumar <samanthakumar@google.com> Cc: Willem de Bruijn <willemb@google.com> Tested-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/udp.c')
-rw-r--r--net/ipv6/udp.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 9aa7c1c7a9ce..b2ef061e6836 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -427,7 +427,8 @@ try_again:
if (is_udp4) {
if (inet->cmsg_flags)
- ip_cmsg_recv(msg, skb);
+ ip_cmsg_recv_offset(msg, skb,
+ sizeof(struct udphdr), off);
} else {
if (np->rxopt.all)
ip6_datagram_recv_specific_ctl(sk, msg, skb);