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| author | Eric Dumazet <edumazet@google.com> | 2019-06-21 06:09:55 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-06-21 20:58:42 -0400 |
| commit | b6653b3629e5b88202be3c9abc44713973f5c4b4 (patch) | |
| tree | 343bd0b3c644e067a351815751dfb25751047399 /net/ipv4/tcp_output.c | |
| parent | 85f9aa7565bd79b039325f2c01af7ffa717924df (diff) | |
| download | lwn-b6653b3629e5b88202be3c9abc44713973f5c4b4.tar.gz lwn-b6653b3629e5b88202be3c9abc44713973f5c4b4.zip | |
tcp: refine memory limit test in tcp_fragment()
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: Eric Dumazet <edumazet@google.com>
Reported-by: Christoph Paasch <cpaasch@apple.com>
Tested-by: Christoph Paasch <cpaasch@apple.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_output.c')
| -rw-r--r-- | net/ipv4/tcp_output.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index 00c01a01b547..0ebc33d1c9e5 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -1296,7 +1296,8 @@ 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; } |