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authorAlexander Lobakin <alobakin@pm.me>2020-11-11 20:45:25 +0000
committerJakub Kicinski <kuba@kernel.org>2020-11-12 09:55:43 -0800
commit4b1a86281cc1d0de46df3ad2cb8c1f86ac07681c (patch)
tree224c27eb3a0ced79f988c9ef7644f4b8cdb9d60c
parent8a5c2906c52f4a81939b4f8536e0004a4193a154 (diff)
downloadlinux-4b1a86281cc1d0de46df3ad2cb8c1f86ac07681c.tar.bz2
net: udp: fix UDP header access on Fast/frag0 UDP GRO
UDP GRO uses udp_hdr(skb) in its .gro_receive() callback. While it's probably OK for non-frag0 paths (when all headers or even the entire frame are already in skb head), this inline points to junk when using Fast GRO (napi_gro_frags() or napi_gro_receive() with only Ethernet header in skb head and all the rest in the frags) and breaks GRO packet compilation and the packet flow itself. To support both modes, skb_gro_header_fast() + skb_gro_header_slow() are typically used. UDP even has an inline helper that makes use of them, udp_gro_udphdr(). Use that instead of troublemaking udp_hdr() to get rid of the out-of-order delivers. Present since the introduction of plain UDP GRO in 5.0-rc1. Fixes: e20cf8d3f1f7 ("udp: implement GRO for plain UDP sockets.") Cc: Eric Dumazet <edumazet@google.com> Signed-off-by: Alexander Lobakin <alobakin@pm.me> Acked-by: Willem de Bruijn <willemb@google.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
-rw-r--r--net/ipv4/udp_offload.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/udp_offload.c b/net/ipv4/udp_offload.c
index e67a66fbf27b..13740e9fe6ec 100644
--- a/net/ipv4/udp_offload.c
+++ b/net/ipv4/udp_offload.c
@@ -366,7 +366,7 @@ out:
static struct sk_buff *udp_gro_receive_segment(struct list_head *head,
struct sk_buff *skb)
{
- struct udphdr *uh = udp_hdr(skb);
+ struct udphdr *uh = udp_gro_udphdr(skb);
struct sk_buff *pp = NULL;
struct udphdr *uh2;
struct sk_buff *p;