4719. [bug] Address PVS static analyzer warnings. [RT #45946]

CHANGES

+4719.	[bug]		Address PVS static analyzer warnings. [RT #45946]
+
 4718.	[func]		Avoid seaching for a owner name compression pointer
 			more than once when writing out a RRset. [RT #45802]
 

bin/dig/nslookup.c

@@ -637,7 +637,12 @@ version(void) {
 
 static void
 setoption(char *opt) {
-	if (strncasecmp(opt, "all", 3) == 0) {
+	size_t l = strlen(opt);
+
+#define CHECKOPT(A, N) \
+	((l >= N) && (l < sizeof(A)) && (strncasecmp(opt, A, l) == 0))
+
+	if (CHECKOPT("all", 3) == 0) {
 		show_settings(ISC_TRUE, ISC_FALSE);
 	} else if (strncasecmp(opt, "class=", 6) == 0) {
 		if (testclass(&opt[6]))
@@ -691,43 +696,43 @@ setoption(char *opt) {
 		set_timeout(&opt[8]);
 	} else if (strncasecmp(opt, "t=", 2) == 0) {
 		set_timeout(&opt[2]);
-	} else if (strncasecmp(opt, "rec", 3) == 0) {
+	} else if (CHECKOPT("recurse", 3)) {
 		recurse = ISC_TRUE;
-	} else if (strncasecmp(opt, "norec", 5) == 0) {
+	} else if (CHECKOPT("norecurse", 5)) {
 		recurse = ISC_FALSE;
 	} else if (strncasecmp(opt, "retry=", 6) == 0) {
 		set_tries(&opt[6]);
 	} else if (strncasecmp(opt, "ret=", 4) == 0) {
 		set_tries(&opt[4]);
-	} else if (strncasecmp(opt, "def", 3) == 0) {
+	} else if (CHECKOPT("defname", 3)) {
 		usesearch = ISC_TRUE;
-	} else if (strncasecmp(opt, "nodef", 5) == 0) {
+	} else if (CHECKOPT("nodefname", 5)) {
 		usesearch = ISC_FALSE;
-	} else if (strncasecmp(opt, "vc", 3) == 0) {
+	} else if (CHECKOPT("vc", 2) == 0) {
 		tcpmode = ISC_TRUE;
 		tcpmode_set = ISC_TRUE;
-	} else if (strncasecmp(opt, "novc", 5) == 0) {
+	} else if (CHECKOPT("novc", 4) == 0) {
 		tcpmode = ISC_FALSE;
 		tcpmode_set = ISC_TRUE;
-	} else if (strncasecmp(opt, "deb", 3) == 0) {
+	} else if (CHECKOPT("debug", 3) == 0) {
 		short_form = ISC_FALSE;
 		showsearch = ISC_TRUE;
-	} else if (strncasecmp(opt, "nodeb", 5) == 0) {
+	} else if (CHECKOPT("nodebug", 5) == 0) {
 		short_form = ISC_TRUE;
 		showsearch = ISC_FALSE;
-	} else if (strncasecmp(opt, "d2", 2) == 0) {
+	} else if (CHECKOPT("d2", 2) == 0) {
 		debugging = ISC_TRUE;
-	} else if (strncasecmp(opt, "nod2", 4) == 0) {
+	} else if (CHECKOPT("nod2", 4) == 0) {
 		debugging = ISC_FALSE;
-	} else if (strncasecmp(opt, "search", 3) == 0) {
+	} else if (CHECKOPT("search", 3) == 0) {
 		usesearch = ISC_TRUE;
-	} else if (strncasecmp(opt, "nosearch", 5) == 0) {
+	} else if (CHECKOPT("nosearch", 5) == 0) {
 		usesearch = ISC_FALSE;
-	} else if (strncasecmp(opt, "sil", 3) == 0) {
+	} else if (CHECKOPT("sil", 3) == 0) {
 		/* deprecation_msg = ISC_FALSE; */
-	} else if (strncasecmp(opt, "fail", 3) == 0) {
+	} else if (CHECKOPT("fail", 3) == 0) {
 		nofail=ISC_FALSE;
-	} else if (strncasecmp(opt, "nofail", 3) == 0) {
+	} else if (CHECKOPT("nofail", 5) == 0) {
 		nofail=ISC_TRUE;
 	} else if (strncasecmp(opt, "ndots=", 6) == 0) {
 		set_ndots(&opt[6]);

bin/dnssec/dnssectool.c

@@ -1835,7 +1835,7 @@ verifyzone(dns_db_t *db, dns_dbversion_t *ver,
 		for (i = 0; i < 256; i++) {
 			if ((ksk_algorithms[i] != 0) ||
 			    (standby_ksk[i] != 0) ||
-			    (revoked_zsk[i] != 0) ||
+			    (revoked_ksk[i] != 0) ||
 			    (zsk_algorithms[i] != 0) ||
 			    (standby_zsk[i] != 0) ||
 			    (revoked_zsk[i] != 0)) {

lib/dns/adb.c

@@ -2172,7 +2172,7 @@ log_quota(dns_adbentry_t *entry, const char *fmt, ...) {
 	isc_netaddr_format(&netaddr, addrbuf, sizeof(addrbuf));
 
 	isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE, DNS_LOGMODULE_ADB,
-		      ISC_LOG_INFO, "adb: quota %s (%d/%d): %s",
+		      ISC_LOG_INFO, "adb: quota %s (%u/%u): %s",
 		      addrbuf, entry->active, entry->quota, msgbuf);
 }
 
@@ -2847,7 +2847,7 @@ void
 dns_adb_whenshutdown(dns_adb_t *adb, isc_task_t *task, isc_event_t **eventp) {
 	isc_task_t *tclone;
 	isc_event_t *event;
-	isc_boolean_t zeroirefcnt = ISC_FALSE;
+	isc_boolean_t zeroirefcnt;
 
 	/*
 	 * Send '*eventp' to 'task' when 'adb' has shutdown.
@@ -2860,8 +2860,8 @@ dns_adb_whenshutdown(dns_adb_t *adb, isc_task_t *task, isc_event_t **eventp) {
 	*eventp = NULL;
 
 	LOCK(&adb->lock);
-
 	LOCK(&adb->reflock);
+
 	zeroirefcnt = ISC_TF(adb->irefcnt == 0);
 
 	if (adb->shutting_down && zeroirefcnt &&
@@ -3498,10 +3498,10 @@ dump_adb(dns_adb_t *adb, FILE *f, isc_boolean_t debug, isc_stdtime_t now) {
 			print_namehook_list(f, "v6", adb,
 					    &name->v6, debug, now);
 
-			if (debug)
+			if (debug) {
 				print_fetch_list(f, name);
-			if (debug)
 				print_find_list(f, name);
+			}
 		}
 	}
 
@@ -3557,7 +3557,7 @@ dump_entry(FILE *f, dns_adb_t *adb, dns_adbentry_t *entry,
 		fprintf(f, " [ttl %d]", entry->expires - now);
 
 	if (adb != NULL && adb->quota != 0 && adb->atr_freq != 0) {
-		fprintf(f, " [atr %0.2f] [quota %d]",
+		fprintf(f, " [atr %0.2f] [quota %u]",
 			entry->atr, entry->quota);
 	}
 
@@ -4232,6 +4232,8 @@ static int quota_adj[] = {
 	312, 307, 303, 298, 294, 290, 286, 282, 278
 };
 
+#define QUOTA_ADJ_SIZE (sizeof(quota_adj)/sizeof(quota_adj[0]))
+
 /*
  * Caller must hold adbentry lock
  */
@@ -4270,12 +4272,13 @@ maybe_adjust_quota(dns_adb_t *adb, dns_adbaddrinfo_t *addr,
 	if (addr->entry->atr < adb->atr_low && addr->entry->mode > 0) {
 		addr->entry->quota = adb->quota *
 			quota_adj[--addr->entry->mode] / 10000;
-		log_quota(addr->entry, "atr %0.2f, quota increased to %d",
+		log_quota(addr->entry, "atr %0.2f, quota increased to %u",
 			  addr->entry->atr, addr->entry->quota);
-	} else if (addr->entry->atr > adb->atr_high && addr->entry->mode < 99) {
+	} else if (addr->entry->atr > adb->atr_high &&
+		   addr->entry->mode < (QUOTA_ADJ_SIZE - 1)) {
 		addr->entry->quota = adb->quota *
 			quota_adj[++addr->entry->mode] / 10000;
-		log_quota(addr->entry, "atr %0.2f, quota decreased to %d",
+		log_quota(addr->entry, "atr %0.2f, quota decreased to %u",
 			  addr->entry->atr, addr->entry->quota);
 	}
 

lib/dns/rbt.c

@@ -868,6 +868,7 @@ dns_rbt_deserialize_tree(void *base_address, size_t filesize,
 	file_header_t *header;
 	dns_rbt_t *rbt = NULL;
 	isc_uint64_t crc;
+	unsigned int host_big_endian;
 
 	REQUIRE(originp == NULL || *originp == NULL);
 	REQUIRE(rbtp != NULL && *rbtp == NULL);
@@ -897,7 +898,9 @@ dns_rbt_deserialize_tree(void *base_address, size_t filesize,
 		result = ISC_R_INVALIDFILE;
 		goto cleanup;
 	}
-	if (header->bigendian != (1 == htonl(1)) ? 1 : 0) {
+
+	host_big_endian = (1 == htonl(1));
+	if (header->bigendian != host_big_endian) {
 		result = ISC_R_INVALIDFILE;
 		goto cleanup;
 	}

lib/dns/tsig.c

@@ -1570,13 +1570,13 @@ tsig_verify_tcp(isc_buffer_t *source, dns_message_t *msg) {
 		addcount_n = ntohs(addcount);
 		addcount = htons((isc_uint16_t)(addcount_n - 1));
 		memmove(&header[DNS_MESSAGE_HEADERLEN - 2], &addcount, 2);
-	}
 
-	/*
-	 * Put in the original id.
-	 */
-	/* XXX Can TCP transfers be forwarded?  How would that work? */
-	if (has_tsig) {
+		/*
+		 * Put in the original id.
+		 *
+		 * XXX Can TCP transfers be forwarded?  How would that
+		 * work?
+		 */
 		id = htons(tsig.originalid);
 		memmove(&header[0], &id, 2);
 	}

lib/isc/unix/interfaceiter.c

@@ -177,7 +177,7 @@ linux_if_inet6_current(isc_interfaceiter_t *iter) {
 	char address[33];
 	char name[IF_NAMESIZE+1];
 	struct in6_addr addr6;
-	int ifindex, prefix, flag3, flag4;
+	unsigned int ifindex, prefix, flag3, flag4;
 	int res;
 	unsigned int i;
 

lib/ns/xfrout.c

@@ -1173,8 +1173,6 @@ xfrout_ctx_create(isc_mem_t *mctx, ns_client_t *client, unsigned int id,
 	xfr->tsigkey = tsigkey;
 	xfr->lasttsig = lasttsig;
 	xfr->verified_tsig = verified_tsig;
-	xfr->txmem = NULL;
-	xfr->txmemlen = 0;
 	xfr->nmsg = 0;
 	xfr->many_answers = many_answers;
 	xfr->sends = 0;