Author: tuexen
Date: Mon May 18 18:32:58 2020
New Revision: 361222
URL: https://svnweb.freebsd.org/changeset/base/361222
Log:
Avoid an integer underflow.
MFC after: 3 days
Modified:
head/sys/netinet/sctp_asconf.c
Modified: head/sys/netinet/sctp_asconf.c
==============================================================================
--- head/sys/netinet/sctp_asconf.c Mon May 18 18:27:10 2020
(r361221)
+++ head/sys/netinet/sctp_asconf.c Mon May 18 18:32:58 2020
(r361222)
@@ -1797,9 +1797,9 @@ sctp_handle_asconf_ack(struct mbuf *m, int offset,
} /* switch */
/* update remaining ASCONF-ACK message length to process */
- ack_length -= SCTP_SIZE32(param_length);
- if (ack_length <= 0) {
- /* no more data in the mbuf chain */
+ if (ack_length > SCTP_SIZE32(param_length)) {
+ ack_length -= SCTP_SIZE32(param_length);
+ } else {
break;
}
offset += SCTP_SIZE32(param_length);
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