bpf, sockmap: Fix data loss caused by using apply_bytes on ingress redirect
authorPengcheng Yang <yangpc@wangsu.com>
Tue, 29 Nov 2022 10:40:40 +0000 (18:40 +0800)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Sat, 31 Dec 2022 12:14:14 +0000 (13:14 +0100)
commit7201e4f4f52e26e36230d0fc6e98e32b4c727a3c
tree4422c8fcc0104e67da80b7e14d38f6b2d7ecb731
parent6105ed3598e19e419221edad6a0436eb568501c6
bpf, sockmap: Fix data loss caused by using apply_bytes on ingress redirect

[ Upstream commit 9072931f020bfd907d6d89ee21ff1481cd78b407 ]

Use apply_bytes on ingress redirect, when apply_bytes is less than
the length of msg data, some data may be skipped and lost in
bpf_tcp_ingress().

If there is still data in the scatterlist that has not been consumed,
we cannot move the msg iter.

Fixes: 604326b41a6f ("bpf, sockmap: convert to generic sk_msg interface")
Signed-off-by: Pengcheng Yang <yangpc@wangsu.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Jakub Sitnicki <jakub@cloudflare.com>
Link: https://lore.kernel.org/bpf/1669718441-2654-4-git-send-email-yangpc@wangsu.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
net/ipv4/tcp_bpf.c