diff options
| author | Gerrit Renker <gerrit@erg.abdn.ac.uk> | 2006-12-10 04:59:14 +0300 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2006-12-12 01:34:39 +0300 |
| commit | 45393a66a2c30fc8ed86e6c79a63a3cd5231c69f (patch) | |
| tree | 628feedd3d6d1fbdb1728d57e4bb62e1fc61e5c4 /net/dccp | |
| parent | 5fce9a2da8a3b4ed088d9c0ac7c938a638044fdb (diff) | |
| download | linux-45393a66a2c30fc8ed86e6c79a63a3cd5231c69f.tar.xz | |
[DCCP] ccid3: Check against too large p
This patch follows a suggestion by Ian McDonald and ensures that in
the current code the value of p can not exceed 100%. Such a value is
illegal and would consequently cause a bug condition in tfrc_calc_x().
The receiver case is also tested, and a warning message is added.
Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Diffstat (limited to 'net/dccp')
| -rw-r--r-- | net/dccp/ccids/ccid3.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/net/dccp/ccids/ccid3.c b/net/dccp/ccids/ccid3.c index 66a27b9688ca..f1b745ee9cb6 100644 --- a/net/dccp/ccids/ccid3.c +++ b/net/dccp/ccids/ccid3.c @@ -444,9 +444,9 @@ static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) /* Update loss event rate */ pinv = opt_recv->ccid3or_loss_event_rate; - if (pinv == ~0U || pinv == 0) + if (pinv == ~0U || pinv == 0) /* see RFC 4342, 8.5 */ hctx->ccid3hctx_p = 0; - else + else /* can not exceed 100% */ hctx->ccid3hctx_p = 1000000 / pinv; dccp_timestamp(sk, &now); @@ -733,10 +733,15 @@ static void ccid3_hc_rx_send_feedback(struct sock *sk) /* Convert to multiples of 10us */ hcrx->ccid3hcrx_elapsed_time = timeval_delta(&now, &packet->dccphrx_tstamp) / 10; + if (hcrx->ccid3hcrx_p == 0) - hcrx->ccid3hcrx_pinv = ~0; - else + hcrx->ccid3hcrx_pinv = ~0U; /* see RFC 4342, 8.5 */ + else if (hcrx->ccid3hcrx_p > 1000000) { + DCCP_WARN("p (%u) > 100%%\n", hcrx->ccid3hcrx_p); + hcrx->ccid3hcrx_pinv = 1; /* use 100% in this case */ + } else hcrx->ccid3hcrx_pinv = 1000000 / hcrx->ccid3hcrx_p; + dp->dccps_hc_rx_insert_options = 1; dccp_send_ack(sk); } |