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authorGerrit Renker <gerrit@erg.abdn.ac.uk>2007-10-04 14:43:09 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2007-10-10 16:54:35 -0700
commit5e28599a6e45eb8ce7e50510b06c3a34ebf1a8fa (patch)
treeff6a34c677f1c16a5fd0921f75fbe58a1568ca6e /net/dccp
parent6c583248083c30c5305ec561e79f666ca465b376 (diff)
[CCID2]: Sequence number wraparound issues
This replaces several uses of standard arithmetic with the DCCP sequence number arithmetic functions. The problem here is that the sequence number wrap-around was not taken into consideration. * Condition "seqp->ccid2s_seq <= prev->ccid2s_seq" has been replaced by dccp_delta_seqno(seqp->ccid2s_seq, prev->ccid2s_seq) >= 0 since if seqp is `before' prev, then the delta_seqno() is positive. * The test whether sequence numbers `a' and `b' are consecutive has the form dccp_delta_seqno(a, b) == 1 * Increment of ccid2hctx_rpseq could be done using dccp_inc_seqno(), but since here the incremented ccid2hctx_rpseq == seqno, used assignment instead. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/dccp')
-rw-r--r--net/dccp/ccids/ccid2.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/net/dccp/ccids/ccid2.c b/net/dccp/ccids/ccid2.c
index 1dff4188f3f..426008e3b7e 100644
--- a/net/dccp/ccids/ccid2.c
+++ b/net/dccp/ccids/ccid2.c
@@ -59,7 +59,8 @@ static void ccid2_hc_tx_check_sanity(const struct ccid2_hc_tx_sock *hctx)
pipe++;
/* packets are sent sequentially */
- BUG_ON(seqp->ccid2s_seq <= prev->ccid2s_seq);
+ BUG_ON(dccp_delta_seqno(seqp->ccid2s_seq,
+ prev->ccid2s_seq ) >= 0);
BUG_ON(time_before(seqp->ccid2s_sent,
prev->ccid2s_sent));
@@ -562,8 +563,8 @@ static void ccid2_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
hctx->ccid2hctx_rpseq = seqno;
} else {
/* check if packet is consecutive */
- if ((hctx->ccid2hctx_rpseq + 1) == seqno)
- hctx->ccid2hctx_rpseq++;
+ if (dccp_delta_seqno(hctx->ccid2hctx_rpseq, seqno) == 1)
+ hctx->ccid2hctx_rpseq = seqno;
/* it's a later packet */
else if (after48(seqno, hctx->ccid2hctx_rpseq)) {
hctx->ccid2hctx_rpdupack++;