Commit dad3a931 authored by Eric Dumazet's avatar Eric Dumazet Committed by Greg Kroah-Hartman

tcp: refine memory limit test in tcp_fragment()

commit b6653b3629e5b88202be3c9abc44713973f5c4b4 upstream.

tcp_fragment() might be called for skbs in the write queue.

Memory limits might have been exceeded because tcp_sendmsg() only
checks limits at full skb (64KB) boundaries.

Therefore, we need to make sure tcp_fragment() wont punish applications
that might have setup very low SO_SNDBUF values.

Fixes: f070ef2ac667 ("tcp: tcp_fragment() should apply sane memory limits")
Signed-off-by: 's avatarEric Dumazet <edumazet@google.com>
Reported-by: 's avatarChristoph Paasch <cpaasch@apple.com>
Tested-by: 's avatarChristoph Paasch <cpaasch@apple.com>
Signed-off-by: 's avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: 's avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 63bbbcd8
......@@ -1299,7 +1299,8 @@ int tcp_fragment(struct sock *sk, enum tcp_queue tcp_queue,
if (nsize < 0)
nsize = 0;
if (unlikely((sk->sk_wmem_queued >> 1) > sk->sk_sndbuf)) {
if (unlikely((sk->sk_wmem_queued >> 1) > sk->sk_sndbuf &&
tcp_queue != TCP_FRAG_IN_WRITE_QUEUE)) {
NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPWQUEUETOOBIG);
return -ENOMEM;
}
......
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