diff options
Diffstat (limited to 'src/ipcpd/udp/udp.c')
| -rw-r--r-- | src/ipcpd/udp/udp.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/src/ipcpd/udp/udp.c b/src/ipcpd/udp/udp.c index 452bbc1a..168ea718 100644 --- a/src/ipcpd/udp/udp.c +++ b/src/ipcpd/udp/udp.c @@ -352,13 +352,18 @@ static int udp_ipcp_mgmt_frame(struct __SOCKADDR c_saddr, qosspec_t qs; buffer_t data; + /* Defence against malformed/corrupted wire input. */ + if (len < sizeof(*msg)) + return -1; + msg = (struct mgmt_msg *) buf; switch (msg->code) { case FLOW_REQ: msg_len = sizeof(*msg) + ipcp_dir_hash_len(); - assert(len >= msg_len); + if (len < msg_len) + return -1; data.len = len - msg_len; data.data = (uint8_t *) buf + msg_len; @@ -377,8 +382,6 @@ static int udp_ipcp_mgmt_frame(struct __SOCKADDR c_saddr, (uint8_t *) (msg + 1), qs, &data); case FLOW_REPLY: - assert(len >= sizeof(*msg)); - data.len = len - sizeof(*msg); data.data = (uint8_t *) buf + sizeof(*msg); |