1) Passing wrong skb to tcp_adjust_fackets_out could corrupt
fastpath_cnt_hint as tcp_skb_pcount(next_skb) is not included
to it if hint points exactly to the next_skb (it's lagging
behind, see sacktag).
2) When fastpath_skb_hint is put backwards to avoid dangling
skb reference, the skb's pcount must also be removed from count
(not included like above).
Reported by Cedric Le Goater [EMAIL PROTECTED]
Signed-off-by: Ilpo Järvinen [EMAIL PROTECTED]
---
net/ipv4/tcp_output.c |6 --
1 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 6199abe..5329675 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -1755,14 +1755,16 @@ static void tcp_retrans_try_collapse(struct sock *sk,
struct sk_buff *skb, int m
if (tcp_is_reno(tp) tp-sacked_out)
tcp_dec_pcount_approx(tp-sacked_out, next_skb);
- tcp_adjust_fackets_out(tp, skb, tcp_skb_pcount(next_skb));
+ tcp_adjust_fackets_out(tp, next_skb, tcp_skb_pcount(next_skb));
tp-packets_out -= tcp_skb_pcount(next_skb);
/* changed transmit queue under us so clear hints */
tcp_clear_retrans_hints_partial(tp);
/* manually tune sacktag skb hint */
- if (tp-fastpath_skb_hint == next_skb)
+ if (tp-fastpath_skb_hint == next_skb) {
tp-fastpath_skb_hint = skb;
+ tp-fastpath_cnt_hint -= tcp_skb_pcount(skb);
+ }
sk_stream_free_skb(sk, next_skb);
}
--
1.5.0.6
-
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