Merge pull request #1263 from waja/coverity_fixes

Serveral coverity fixes from nagios-plugins

lib/utils_cmd.c

@@ -390,6 +390,9 @@ cmd_file_read ( char *filename, output *out, int flags)
 	
 	if(out)
 		out->lines = _cmd_fetch_output (fd, out, flags);
+	
+	if (close(fd) == -1)
+		die( STATE_UNKNOWN, _("Error closing %s: %s"), filename, strerror(errno) );
 
 	return 0;
 }

plugins-root/check_dhcp.c

@@ -837,7 +837,7 @@ int add_dhcp_offer(struct in_addr source,dhcp_packet *offer_packet){
 		return ERROR;
 
 	/* process all DHCP options present in the packet */
-	for(x=4;x<MAX_DHCP_OPTIONS_LENGTH;){
+	for(x=4;x<MAX_DHCP_OPTIONS_LENGTH-1;){
 
 		if((int)offer_packet->options[x]==-1)
 			break;

plugins/check_apt.c

@@ -223,6 +223,9 @@ int run_upgrade(int *pkgcount, int *secpkgcount){
 	regex_t ireg, ereg, sreg;
 	char *cmdline=NULL, rerrbuf[64];
 
+	/* initialize ereg as it is possible it is printed while uninitialized */
+	memset(&ereg, "\0", sizeof(ereg.buffer));
+
 	if(upgrade==NO_UPGRADE) return STATE_OK;
 
 	/* compile the regexps */

plugins/check_http.c

@@ -1243,6 +1243,7 @@ redir (char *pos, char *status_line)
   if (addr == NULL)
     die (STATE_UNKNOWN, _("HTTP UNKNOWN - Could not allocate addr\n"));
 
+  memset(addr, 0, MAX_IPV4_HOSTLENGTH);
   url = malloc (strcspn (pos, "\r\n"));
   if (url == NULL)
     die (STATE_UNKNOWN, _("HTTP UNKNOWN - Could not allocate URL\n"));
@@ -1333,8 +1334,8 @@ redir (char *pos, char *status_line)
          max_depth, type, addr, i, url, (display_html ? "</A>" : ""));
 
   if (server_port==i &&
-      !strcmp(server_address, addr) &&
-      (host_name && !strcmp(host_name, addr)) &&
+      !strncmp(server_address, addr, MAX_IPV4_HOSTLENGTH) &&
+      (host_name && !strncmp(host_name, addr, MAX_IPV4_HOSTLENGTH)) &&
       !strcmp(server_url, url))
     die (STATE_WARNING,
          _("HTTP WARNING - redirection creates an infinite loop - %s://%s:%d%s%s\n"),
@@ -1343,11 +1344,11 @@ redir (char *pos, char *status_line)
   strcpy (server_type, type);
 
   free (host_name);
-  host_name = strdup (addr);
+  host_name = strndup (addr, MAX_IPV4_HOSTLENGTH);
 
   if (!(followsticky & STICKY_HOST)) {
     free (server_address);
-    server_address = strdup (addr);
+    server_address = strndup (addr, MAX_IPV4_HOSTLENGTH);
   }
   if (!(followsticky & STICKY_PORT)) {
     server_port = i;
@@ -1366,6 +1367,7 @@ redir (char *pos, char *status_line)
     printf (_("Redirection to %s://%s:%d%s\n"), server_type,
             host_name ? host_name : server_address, server_port, server_url);
 
+  free(addr);
   check_http ();
 }
 

plugins/check_ntp.c

@@ -517,13 +517,14 @@ setup_control_request(ntp_control_message *p, uint8_t opcode, uint16_t seq){
 double jitter_request(const char *host, int *status){
 	int conn=-1, i, npeers=0, num_candidates=0, syncsource_found=0;
 	int run=0, min_peer_sel=PEER_INCLUDED, num_selected=0, num_valid=0;
-	int peers_size=0, peer_offset=0;
+	int peers_size=0, peer_offset=0, bytes_read=0;
 	ntp_assoc_status_pair *peers=NULL;
 	ntp_control_message req;
 	const char *getvar = "jitter";
 	double rval = 0.0, jitter = -1.0;
 	char *startofvalue=NULL, *nptr=NULL;
 	void *tmp;
+	int ntp_cm_ints = sizeof(uint16_t) * 5 + sizeof(uint8_t) * 2;
 
 	/* Long-winded explanation:
 	 * Getting the jitter requires a number of steps:
@@ -608,7 +609,15 @@ double jitter_request(const char *host, int *status){
 
 				req.count = htons(MAX_CM_SIZE);
 				DBG(printf("recieving READVAR response...\n"));
-				read(conn, &req, SIZEOF_NTPCM(req));
+
+				/* cov-66524 - req.data not null terminated before usage. Also covers verifying struct was returned correctly*/
+				if ((bytes_read = read(conn, &req, SIZEOF_NTPCM(req))) == -1)
+					die(STATE_UNKNOWN, _("Cannot read from socket: %s"), strerror(errno));
+				if (bytes_read != ntp_cm_ints + req.count)
+					die(STATE_UNKNOWN, _("Invalid NTP response: %d bytes read does not equal %d plus %d data segment"), bytes_read, ntp_cm_ints, req.count); 
+				/* else null terminate */
+				strncpy(req.data[req.count], "\0", 1);
+
 				DBG(print_ntp_control_message(&req));
 
 				if(req.op&REM_ERROR && strstr(getvar, "jitter")) {

plugins/check_real.c

@@ -178,6 +178,7 @@ main (int argc, char **argv)
 
 		/* watch for the REAL connection string */
 		result = recv (sd, buffer, MAX_INPUT_BUFFER - 1, 0);
+		buffer[result] = "\0"; /* null terminate recieved buffer */
 
 		/* return a CRITICAL status if we couldn't read any data */
 		if (result == -1) {

plugins/negate.c

@@ -44,7 +44,7 @@ const char *email = "devel@monitoring-plugins.org";
 /* char *command_line; */
 
 static const char **process_arguments (int, char **);
-int validate_arguments (char **);
+void validate_arguments (char **);
 void print_help (void);
 void print_usage (void);
 int subst_text = FALSE;
@@ -98,8 +98,7 @@ main (int argc, char **argv)
 		die (max_state_alt (result, STATE_UNKNOWN), _("No data returned from command\n"));
 
 	for (i = 0; i < chld_out.lines; i++) {
-		if (subst_text && result != state[result] &&
-		    result >= 0 && result <= 4) {
+		if (subst_text && result >= 0 && result <= 4 && result != state[result])  {
 			/* Loop over each match found */
 			while ((sub = strstr (chld_out.line[i], state_text (result)))) {
 				/* Terminate the first part and skip over the string we'll substitute */
@@ -206,7 +205,7 @@ process_arguments (int argc, char **argv)
 }
 
 
-int
+void
 validate_arguments (char **command_line)
 {
 	if (command_line[0] == NULL)