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: f070ef2a ("tcp: tcp_fragment() should apply sane memory limits") Signed-off-by: NEric Dumazet <edumazet@google.com> Reported-by: NChristoph Paasch <cpaasch@apple.com> Tested-by: NChristoph Paasch <cpaasch@apple.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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