tree 06dc2aa031ca9cd604ece8a9fd5c5bc8502b2257
parent 797108d134a91afca9fa59c572336b279bc66afb
author Ilpo Järvinen <ilpo.jarvinen@helsinki.fi> 1238627900 +0000
committer David S. Miller <davem@davemloft.net> 1238715105 -0700

tcp: miscounts due to tcp_fragment pcount reset

It seems that trivial reset of pcount to one was not sufficient
in tcp_retransmit_skb. Multiple counters experience a positive
miscount when skb's pcount gets lowered without the necessary
adjustments (depending on skb's sacked bits which exactly), at
worst a packets_out miscount can crash at RTO if the write queue
is empty!

Triggering this requires mss change, so bidir tcp or mtu probe or
like.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Reported-by: Markus Trippelsdorf <markus@trippelsdorf.de>
Tested-by: Uwe Bugla <uwe.bugla@gmx.de>
Signed-off-by: David S. Miller <davem@davemloft.net>