[CCID2]: Fix sequence number arithmetic/comparisons
This replaces use of normal subtraction with modulo-48 subtraction.
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@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/dccp/ccids/ccid2.c b/net/dccp/ccids/ccid2.c
index 7873dc7..5552218 100644
--- a/net/dccp/ccids/ccid2.c
+++ b/net/dccp/ccids/ccid2.c
@@ -24,9 +24,6 @@
/*
* This implementation should follow RFC 4341
- *
- * BUGS:
- * - sequence number wrapping
*/
#include "../ccid.h"
@@ -619,9 +616,8 @@
/* go through this ack vector */
while (veclen--) {
const u8 rl = *vector & DCCP_ACKVEC_LEN_MASK;
- u64 ackno_end_rl;
+ u64 ackno_end_rl = SUB48(ackno, rl);
- dccp_set_seqno(&ackno_end_rl, ackno - rl);
ccid2_pr_debug("ackvec start:%llu end:%llu\n",
(unsigned long long)ackno,
(unsigned long long)ackno_end_rl);
@@ -671,8 +667,7 @@
if (done)
break;
-
- dccp_set_seqno(&ackno, ackno_end_rl - 1);
+ ackno = SUB48(ackno_end_rl, 1);
vector++;
}
if (done)
