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authorGerrit Renker <gerrit@erg.abdn.ac.uk>2006-12-03 19:50:42 +0300
committerArnaldo Carvalho de Melo <acme@mandriva.com>2006-12-03 19:50:42 +0300
commit76d127779e51fbf67ad6793214369aa1fea90278 (patch)
treecc6cbeb3b7eb6c59b5e13bb12a74e0fc89988c78 /net
parent8a508ac26e72aa203677aa6a8464bd3ea44216a6 (diff)
downloadlinux-76d127779e51fbf67ad6793214369aa1fea90278.tar.xz
[DCCP]: Fix BUG in retransmission delay calculation
This bug resulted in ccid3_hc_tx_send_packet returning negative delay values, which in turn triggered silently dequeueing packets in dccp_write_xmit. As a result, only a few out of the submitted packets made it at all onto the network. Occasionally, when dccp_wait_for_ccid was involved, this also triggered a bug warning since ccid3_hc_tx_send_packet returned a negative value (which in reality was a negative delay value). The cause for this bug lies in the comparison if (delay >= hctx->ccid3hctx_delta) return delay / 1000L; The type of `delay' is `long', that of ccid3hctx_delta is `u32'. When comparing negative long values against u32 values, the test returned `true' whenever delay was smaller than 0 (meaning the packet was overdue to send). The fix is by casting, subtracting, and then testing the difference with regard to 0. This has been tested and shown to work. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Signed-off-by: Ian McDonald <ian.mcdonald@jandi.co.nz> Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Diffstat (limited to 'net')
-rw-r--r--net/dccp/ccids/ccid3.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/dccp/ccids/ccid3.c b/net/dccp/ccids/ccid3.c
index 99807783a22f..22a07248c240 100644
--- a/net/dccp/ccids/ccid3.c
+++ b/net/dccp/ccids/ccid3.c
@@ -339,7 +339,7 @@ static int ccid3_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb)
* else
* // send the packet in (t_nom - t_now) milliseconds.
*/
- if (delay >= hctx->ccid3hctx_delta)
+ if (delay - (long)hctx->ccid3hctx_delta >= 0)
return delay / 1000L;
break;
case TFRC_SSTATE_TERM: