tcp: refine memory limit test in tcp_fragment()
authorEric Dumazet <edumazet@google.com>
Fri, 21 Jun 2019 13:09:55 +0000 (06:09 -0700)
committerDavid S. Miller <davem@davemloft.net>
Sat, 22 Jun 2019 00:58:42 +0000 (20:58 -0400)
commitb6653b3629e5b88202be3c9abc44713973f5c4b4
tree343bd0b3c644e067a351815751dfb25751047399
parent85f9aa7565bd79b039325f2c01af7ffa717924df
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>
net/ipv4/tcp_output.c