From: Martin KaFai Lau kafai@fb.com
commit 257a525fe2e49584842c504a92c27097407f778f upstream.
When the commit a6024562ffd7 ("udp: Add GRO functions to UDP socket") added udp[46]_lib_lookup_skb to the udp_gro code path, it broke the reuseport_select_sock() assumption that skb->data is pointing to the transport header.
This patch follows an earlier __udp6_lib_err() fix by passing a NULL skb to avoid calling the reuseport's bpf_prog.
Fixes: a6024562ffd7 ("udp: Add GRO functions to UDP socket") Cc: Tom Herbert tom@herbertland.com Signed-off-by: Martin KaFai Lau kafai@fb.com Acked-by: Song Liu songliubraving@fb.com Signed-off-by: Alexei Starovoitov ast@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- net/ipv4/udp.c | 6 +++++- net/ipv6/udp.c | 2 +- 2 files changed, 6 insertions(+), 2 deletions(-)
--- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -503,7 +503,11 @@ static inline struct sock *__udp4_lib_lo struct sock *udp4_lib_lookup_skb(struct sk_buff *skb, __be16 sport, __be16 dport) { - return __udp4_lib_lookup_skb(skb, sport, dport, &udp_table); + const struct iphdr *iph = ip_hdr(skb); + + return __udp4_lib_lookup(dev_net(skb->dev), iph->saddr, sport, + iph->daddr, dport, inet_iif(skb), + inet_sdif(skb), &udp_table, NULL); } EXPORT_SYMBOL_GPL(udp4_lib_lookup_skb);
--- a/net/ipv6/udp.c +++ b/net/ipv6/udp.c @@ -242,7 +242,7 @@ struct sock *udp6_lib_lookup_skb(struct
return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport, &iph->daddr, dport, inet6_iif(skb), - inet6_sdif(skb), &udp_table, skb); + inet6_sdif(skb), &udp_table, NULL); } EXPORT_SYMBOL_GPL(udp6_lib_lookup_skb);