bpf: udp: Avoid calling reuseport's bpf_prog from udp_gro
authorMartin KaFai Lau <kafai@fb.com>
Fri, 31 May 2019 22:29:13 +0000 (15:29 -0700)
committerCosmin Tanislav <demonsingur@gmail.com>
Thu, 16 May 2024 07:58:22 +0000 (10:58 +0300)
commit088f83cda580cc4dc6f7f96c1662887e1e7a2368
treecaf8705b4c71977e5ced4fe926e7f1bcfa7963da
parent1a92933685e883cd40ca25412e38cb29105aad8b
bpf: udp: Avoid calling reuseport's bpf_prog from udp_gro

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
net/ipv6/udp.c