From ccc2d97cb7c798e785c9f198de243e2b59f7073b Mon Sep 17 00:00:00 2001 From: =?utf8?q?Bj=C3=B8rn=20Mork?= Date: Thu, 6 May 2010 03:44:34 +0000 Subject: [PATCH] ipv4: udp: fix short packet and bad checksum logging MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit commit 2783ef23 moved the initialisation of saddr and daddr after pskb_may_pull() to avoid a potential data corruption. Unfortunately also placing it after the short packet and bad checksum error paths, where these variables are used for logging. The result is bogus output like [92238.389505] UDP: short packet: From 2.0.0.0:65535 23715/178 to 0.0.0.0:65535 Moving the saddr and daddr initialisation above the error paths, while still keeping it after the pskb_may_pull() to keep the fix from commit 2783ef23. Signed-off-by: Bjørn Mork Cc: stable@kernel.org Acked-by: Eric Dumazet Signed-off-by: David S. Miller --- net/ipv4/udp.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c index 8fef859db35d..c36522a0f113 100644 --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -1527,6 +1527,9 @@ int __udp4_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, uh = udp_hdr(skb); ulen = ntohs(uh->len); + saddr = ip_hdr(skb)->saddr; + daddr = ip_hdr(skb)->daddr; + if (ulen > skb->len) goto short_packet; @@ -1540,9 +1543,6 @@ int __udp4_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, if (udp4_csum_init(skb, uh, proto)) goto csum_error; - saddr = ip_hdr(skb)->saddr; - daddr = ip_hdr(skb)->daddr; - if (rt->rt_flags & (RTCF_BROADCAST|RTCF_MULTICAST)) return __udp4_lib_mcast_deliver(net, skb, uh, saddr, daddr, udptable); -- 2.20.1