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tcp: cleanup sk_tx_skb_cache before reuse 

TCP stack relies on the fact that a freshly allocated skb
has skb->cb[] and skb_shinfo(skb)->tx_flags cleared.

When recycling tx skb, we must ensure these fields are cleared.

Fixes: 472c2e07ee ("tcp: add one skb cache for tx")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Soheil Hassas Yeganeh <soheil@google.com>
Cc: Willem de Bruijn <willemb@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2019-03-29 12:46:17 -07:00 committed by David S. Miller
parent faddd6cf67
commit eb70a1ae23
1 changed files with 2 additions and 0 deletions
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2
net/ipv4/tcp.c
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@ -872,6 +872,8 @@ struct sk_buff *sk_stream_alloc_skb(struct sock *sk, int size, gfp_t gfp,
sk->sk_tx_skb_cache = NULL;
pskb_trim(skb, 0);
INIT_LIST_HEAD(&skb->tcp_tsorted_anchor);
skb_shinfo(skb)->tx_flags = 0;
memset(TCP_SKB_CB(skb), 0, sizeof(struct tcp_skb_cb));
return skb;
}
}