From: Vincent Bernat <vincent@bernat.im>
Date: Sun, 4 Oct 2015 00:24:29 +0000 (+0200)
Subject: protocols: don't use assert on paths that can be reached
X-Git-Tag: 0.8.0~51
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=9221b5c249f9e4843f77c7f888d5705348d179c0;p=thirdparty%2Flldpd.git

protocols: don't use assert on paths that can be reached

Malformed packets should not make lldpd crash. Ensure we can handle them
by not using assert() in this part.
---

diff --git a/src/daemon/lldpd.c b/src/daemon/lldpd.c
index 5fb3f204..be94f4f0 100644
--- a/src/daemon/lldpd.c
+++ b/src/daemon/lldpd.c
@@ -252,7 +252,6 @@ lldpd_alloc_mgmt(int family, void *addrptr, size_t addrsize, u_int32_t iface)
 		return NULL;
 	}
 	mgmt->m_family = family;
-	assert(addrsize <= LLDPD_MGMT_MAXADDRSIZE);
 	memcpy(&mgmt->m_addr, addrptr, addrsize);
 	mgmt->m_addrsize = addrsize;
 	mgmt->m_iface = iface;
diff --git a/src/daemon/protocols/cdp.c b/src/daemon/protocols/cdp.c
index 8567679f..83745c8c 100644
--- a/src/daemon/protocols/cdp.c
+++ b/src/daemon/protocols/cdp.c
@@ -25,7 +25,6 @@
 #include <unistd.h>
 #include <errno.h>
 #include <arpa/inet.h>
-#include <assert.h>
 
 static int
 cdp_send(struct lldpd *global,
@@ -438,8 +437,13 @@ cdp_decode(struct lldpd *cfg, char *frame, int s,
 						mgmt = lldpd_alloc_mgmt(LLDPD_AF_IPV4, &addr, 
 									sizeof(struct in_addr), 0);
 						if (mgmt == NULL) {
-							assert(errno == ENOMEM);
-							log_warn("cdp", "unable to allocate memory for management address");
+							if (errno == ENOMEM)
+								log_warn("cdp",
+								    "unable to allocate memory for management address");
+							else
+								log_warn("cdp",
+								    "too large management address received on %s",
+								    hardware->h_ifname);
 							goto malformed;
 						}
 						TAILQ_INSERT_TAIL(&chassis->c_mgmt, mgmt, m_entries);
diff --git a/src/daemon/protocols/edp.c b/src/daemon/protocols/edp.c
index 8eec547f..818dce92 100644
--- a/src/daemon/protocols/edp.c
+++ b/src/daemon/protocols/edp.c
@@ -25,7 +25,6 @@
 #include <errno.h>
 #include <arpa/inet.h>
 #include <fnmatch.h>
-#include <assert.h>
 
 static int seq = 0;
 
diff --git a/src/daemon/protocols/lldp.c b/src/daemon/protocols/lldp.c
index 5a5018bf..deddc3e7 100644
--- a/src/daemon/protocols/lldp.c
+++ b/src/daemon/protocols/lldp.c
@@ -20,7 +20,6 @@
 
 #include <unistd.h>
 #include <errno.h>
-#include <assert.h>
 #include <time.h>
 #include <sys/types.h>
 #include <sys/socket.h>
@@ -161,7 +160,7 @@ static int _lldp_send(struct lldpd *global,
 	/* Management addresses */
 	TAILQ_FOREACH(mgmt, &chassis->c_mgmt, m_entries) {
 		proto = lldpd_af_to_lldp_proto(mgmt->m_family);
-		assert(proto != LLDP_MGMT_ADDR_NONE);
+		if (proto == LLDP_MGMT_ADDR_NONE) continue;
 		if (!(
 			  POKE_START_LLDP_TLV(LLDP_TLV_MGMT_ADDR) &&
 			  /* Size of the address, including its type */
@@ -749,9 +748,12 @@ lldp_decode(struct lldpd *cfg, char *frame, int s,
 				iface = 0;
 			mgmt = lldpd_alloc_mgmt(af, addr_ptr, addr_length, iface);
 			if (mgmt == NULL) {
-				assert(errno == ENOMEM);
-				log_warn("lldp", "unable to allocate memory "
-				    "for management address");
+				if (errno == ENOMEM)
+					log_warn("lldp", "unable to allocate memory "
+					    "for management address");
+				else
+					log_warn("lldp", "too large management address "
+					    "received on %s", hardware->h_ifname);
 				goto malformed;
 			}
 			TAILQ_INSERT_TAIL(&chassis->c_mgmt, mgmt, m_entries);
diff --git a/src/daemon/protocols/sonmp.c b/src/daemon/protocols/sonmp.c
index 30930cb3..b55d73b7 100644
--- a/src/daemon/protocols/sonmp.c
+++ b/src/daemon/protocols/sonmp.c
@@ -24,7 +24,6 @@
 #include <unistd.h>
 #include <errno.h>
 #include <arpa/inet.h>
-#include <assert.h>
 
 static struct sonmp_chassis sonmp_chassis_types[] = {
 	{1, "unknown (via SONMP)"},
@@ -358,8 +357,11 @@ sonmp_decode(struct lldpd *cfg, char *frame, int s,
 	}
 	mgmt = lldpd_alloc_mgmt(LLDPD_AF_IPV4, &address, sizeof(struct in_addr), 0);
 	if (mgmt == NULL) {
-		assert(errno == ENOMEM);
-		log_warn("sonmp", "unable to allocate memory for management address");
+		if (errno == ENOMEM)
+			log_warn("sonmp", "unable to allocate memory for management address");
+		else
+			log_warn("sonmp", "too large management address received on %s",
+			    hardware->h_ifname);
 		goto malformed;
 	}
 	TAILQ_INSERT_TAIL(&chassis->c_mgmt, mgmt, m_entries);