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tcp: fix SO_RCVLOWAT possible hangs under high mem pressure

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[ Upstream commit ba3bb0e76c ]

Whenever tcp_try_rmem_schedule() returns an error, we are under
trouble and should make sure to wakeup readers so that they
can drain socket queues and eventually make room.

Fixes: 03f45c883c ("tcp: avoid extra wakeups for SO_RCVLOWAT users")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Eric Dumazet 2020-06-30 13:51:28 -07:00 committed by Greg Kroah-Hartman
parent aedd1023b6
commit 721e5f54af
1 changed files with 2 additions and 0 deletions
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2
net/ipv4/tcp_input.c
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@ -4494,6 +4494,7 @@ static void tcp_data_queue_ofo(struct sock *sk, struct sk_buff *skb)
if (unlikely(tcp_try_rmem_schedule(sk, skb, skb->truesize))) {
NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPOFODROP);
sk->sk_data_ready(sk);
tcp_drop(sk, skb);
return;
}
@ -4739,6 +4740,7 @@ static void tcp_data_queue(struct sock *sk, struct sk_buff *skb)
sk_forced_mem_schedule(sk, skb->truesize);
else if (tcp_try_rmem_schedule(sk, skb, skb->truesize)) {
NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPRCVQDROP);
sk->sk_data_ready(sk);
goto drop;
}