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bpf: sockmap fix msg->sg.size account on ingress skb 

When converting a skb to msg->sg we forget to set the size after the
latest ktls/tls code conversion. This patch can be reached by doing
a redir into ingress path from BPF skb sock recv hook. Then trying to
read the size fails.

Fix this by setting the size.

Fixes: 604326b41a ("bpf, sockmap: convert to generic sk_msg interface")
Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
John Fastabend 2019-05-13 07:19:55 -07:00 committed by Daniel Borkmann
parent c42253cc88
commit cabede8b4f
1 changed files with 1 additions and 0 deletions
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net/core/skmsg.c
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@ -411,6 +411,7 @@ static int sk_psock_skb_ingress(struct sk_psock *psock, struct sk_buff *skb)
sk_mem_charge(sk, skb->len);
copied = skb->len;
msg->sg.start = 0;
msg->sg.size = copied;
msg->sg.end = num_sge == MAX_MSG_FRAGS ? 0 : num_sge;
msg->skb = skb;