From: Gerrit Renker Date: Sat, 24 Nov 2007 23:32:53 +0000 (-0200) Subject: [CCID2]: Don't assign negative values to Ack Ratio X-Git-Tag: v2.6.25-rc1~1162^2~1352 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=df054e1d00fdafa2e2920319df326ddb3f0d0413;p=linux-2.6 [CCID2]: Don't assign negative values to Ack Ratio Since it makes not sense to assign negative values to Ack Ratio, this patch disallows this possibility. As a consequence, a Bug test for negative Ack Ratio values becomes obsolete. Furthermore, a check against overflow (as Ack Ratio may not exceed 2 bytes, due to RFC 4340, 11.3) has been added. Signed-off-by: Gerrit Renker Acked-by: Ian McDonald Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: David S. Miller --- diff --git a/net/dccp/ccids/ccid2.c b/net/dccp/ccids/ccid2.c index 55522182f2..f18235e8ce 100644 --- a/net/dccp/ccids/ccid2.c +++ b/net/dccp/ccids/ccid2.c @@ -140,7 +140,7 @@ static int ccid2_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb) return 1; /* XXX CCID should dequeue when ready instead of polling */ } -static void ccid2_change_l_ack_ratio(struct sock *sk, int val) +static void ccid2_change_l_ack_ratio(struct sock *sk, u32 val) { struct dccp_sock *dp = dccp_sk(sk); /* @@ -159,9 +159,10 @@ static void ccid2_change_l_ack_ratio(struct sock *sk, int val) if (val > max) val = max; } + if (val > 0xFFFF) /* RFC 4340, 11.3 */ + val = 0xFFFF; - ccid2_pr_debug("changing local ack ratio to %d\n", val); - WARN_ON(val <= 0); + ccid2_pr_debug("changing local ack ratio to %u\n", val); dp->dccps_l_ack_ratio = val; } @@ -572,7 +573,7 @@ static void ccid2_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) hctx->ccid2hctx_rpdupack = -1; /* XXX lame */ hctx->ccid2hctx_rpseq = 0; - ccid2_change_l_ack_ratio(sk, dp->dccps_l_ack_ratio << 1); + ccid2_change_l_ack_ratio(sk, 2 * dp->dccps_l_ack_ratio); } } }