From 483ec3cf70f68627b8ad2d29c36334ff54571a45 Mon Sep 17 00:00:00 2001
From: klebertarcisio <klebertarcisio@yahoo.com.br>
Date: Fri, 2 Apr 2021 19:54:03 -0300
Subject: [PATCH] Avoiding null pointer dereference

---
 ctrl_iface.c   | 2 ++
 dcbtool_cmds.c | 2 ++
 lldp_8021qaz.c | 4 ++++
 lldp_dcbx.c    | 4 ++++
 4 files changed, 12 insertions(+)

diff --git a/ctrl_iface.c b/ctrl_iface.c
index 666f7c8..5f86fd2 100644
--- a/ctrl_iface.c
+++ b/ctrl_iface.c
@@ -180,6 +180,8 @@ int clif_iface_attach(struct clif_data *clifd,
 	} else {
 		tlv = strdup(ibuf);
 		str = tlv;
+		if (!str)
+			goto err_tlv;
 		str++;
 		/* Count number of TLV Modules */
 		tokenize = strtok(str, delim);
diff --git a/dcbtool_cmds.c b/dcbtool_cmds.c
index 0846f83..e1c76c4 100644
--- a/dcbtool_cmds.c
+++ b/dcbtool_cmds.c
@@ -373,6 +373,8 @@ int handle_dcb_cmds(struct clif *clif, int argc, char *argv[], int raw)
 	}
 
 	cmd_args = get_cmd_args();
+	if (!cmd_args)
+		return -1;
 
 	if (get_feature() == FEATURE_DCBX)
 		snprintf(cbuf, sizeof(cbuf), "%c%01x%02x%02x%s",
diff --git a/lldp_8021qaz.c b/lldp_8021qaz.c
index 045bd45..abeae46 100644
--- a/lldp_8021qaz.c
+++ b/lldp_8021qaz.c
@@ -1944,6 +1944,10 @@ int ieee8021qaz_rchange(struct port *port, struct lldp_agent *agent,
 	if (tlv->type == TYPE_1) {
 		clear_ieee8021qaz_rx(qaz_tlvs);
 		rx = malloc(sizeof(*rx));
+		if (!rx) {
+			LLDPAD_INFO("failed malloc for rx\n");
+			return TLV_ERR;
+		}
 		memset(rx, 0, sizeof(*rx));
 		qaz_tlvs->rx = rx;
 		qaz_tlvs->ieee8021qazdu = 0;
diff --git a/lldp_dcbx.c b/lldp_dcbx.c
index 3567634..66df857 100644
--- a/lldp_dcbx.c
+++ b/lldp_dcbx.c
@@ -695,6 +695,10 @@ int dcbx_rchange(struct port *port, struct lldp_agent *agent, struct unpacked_tl
 	 */
 	if (tlv->type == TYPE_1) {
 		manifest = malloc(sizeof(*manifest));
+		if (!manifest) {
+			LLDPAD_INFO("failed malloc for manifest\n");
+			return TLV_ERR;
+		}
 		memset(manifest, 0, sizeof(*manifest));
 		dcbx->manifest = manifest;
 		dcbx->dcbdu = 0;
-- 
2.33.0