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authorEric Dumazet <edumazet@google.com>2020-06-30 23:51:28 +0300
committerDavid S. Miller <davem@davemloft.net>2020-07-02 03:46:04 +0300
commitba3bb0e76ccd464bb66665a1941fabe55dadb3ba (patch)
tree331f8bc7f2b3e7d58d4df3c4e8dcc4d389f32fd6 /net
parent0da7536fb47f51df89ccfcb1fa09f249d9accec5 (diff)
downloadlinux-ba3bb0e76ccd464bb66665a1941fabe55dadb3ba.tar.xz
tcp: fix SO_RCVLOWAT possible hangs under high mem pressure
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: 03f45c883c6f ("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>
Diffstat (limited to 'net')
-rw-r--r--net/ipv4/tcp_input.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index f3a0eb139b76..9615e72656d1 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -4582,6 +4582,7 @@ 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;
}
@@ -4828,6 +4829,7 @@ queue_and_out:
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;
}