Merge pull request #14454 from opensourcerouting/coverity-20230920

lib: fix a bunch of coverity nits

lib/elf_py.c

@@ -1089,7 +1089,9 @@ static void elffile_add_dynreloc(struct elffile *w, Elf_Data *reldata,
 		symidx = relw->symidx = GELF_R_SYM(rela->r_info);
 		sym = relw->sym = gelf_getsym(symdata, symidx, &relw->_sym);
 		if (sym) {
-			relw->symname = elfdata_strptr(strdata, sym->st_name);
+			if (strdata)
+				relw->symname = elfdata_strptr(strdata,
+							       sym->st_name);
 			relw->symvalid = GELF_ST_TYPE(sym->st_info)
 					!= STT_NOTYPE;
 			relw->unresolved = sym->st_shndx == SHN_UNDEF;

lib/event.c

@@ -791,7 +791,12 @@ static struct event *thread_get(struct event_loop *m, uint8_t type,
 	thread->master = m;
 	thread->arg = arg;
 	thread->yield = EVENT_YIELD_TIME_SLOT; /* default */
-	thread->ref = NULL;
+	/* thread->ref is zeroed either by XCALLOC above or by memset before
+	 * being put on the "unuse" list by thread_add_unuse().
+	 * Setting it here again makes coverity complain about a missing
+	 * lock :(
+	 */
+	/* thread->ref = NULL; */
 	thread->ignore_timer_late = false;
 
 	/*

lib/ipaddr.h

@@ -28,6 +28,7 @@ struct ipaddr {
 	enum ipaddr_type_t ipa_type;
 	union {
 		uint8_t addr;
+		uint8_t addrbytes[16];
 		struct in_addr _v4_addr;
 		struct in6_addr _v6_addr;
 	} ip;

lib/northbound.c

@@ -2691,7 +2691,6 @@ void nb_init(struct event_loop *tm,
 	     size_t nmodules, bool db_enabled)
 {
 	struct yang_module *loaded[nmodules], **loadedp = loaded;
-	bool explicit_compile;
 
 	/*
 	 * Currently using this explicit compile feature in libyang2 leads to
@@ -2699,8 +2698,9 @@ void nb_init(struct event_loop *tm,
 	 * of modules until they have all been loaded into the context. This
 	 * avoids multiple recompiles of the same modules as they are
 	 * imported/augmented etc.
+	 * (Done as a #define to make coverity happy)
 	 */
-	explicit_compile = false;
+#define explicit_compile false
 
 	nb_db_enabled = db_enabled;
 

lib/prefix.c

@@ -261,7 +261,7 @@ int evpn_type5_prefix_match(const struct prefix *n, const struct prefix *p)
 		return 0;
 
 	prefixlen = evp->prefix.prefix_addr.ip_prefix_length;
-	np = &evp->prefix.prefix_addr.ip.ip.addr;
+	np = evp->prefix.prefix_addr.ip.ip.addrbytes;
 
 	/* If n's prefix is longer than p's one return 0. */
 	if (prefixlen > p->prefixlen)

lib/printf/printfcommon.h

@@ -68,7 +68,7 @@ io_print(struct io_state *iop, const CHAR * __restrict ptr, size_t len)
 {
 	size_t copylen = len;
 
-	if (!iop->cb)
+	if (!iop->cb || !len)
 		return 0;
 	if (iop->avail < copylen)
 		copylen = iop->avail;

lib/sha256.c

@@ -344,7 +344,7 @@ void HMAC__SHA256_Final(unsigned char digest[32], HMAC_SHA256_CTX *ctx)
 void PBKDF2_SHA256(const uint8_t *passwd, size_t passwdlen, const uint8_t *salt,
 		   size_t saltlen, uint64_t c, uint8_t *buf, size_t dkLen)
 {
-	HMAC_SHA256_CTX PShctx, hctx;
+	HMAC_SHA256_CTX PShctx = {}, hctx;
 	size_t i;
 	uint8_t ivec[4];
 	uint8_t U[32];

lib/vty.c

@@ -2368,8 +2368,7 @@ static void vtysh_read(struct event *thread)
 				printf("result: %d\n", ret);
 				printf("vtysh node: %d\n", vty->node);
 #endif /* VTYSH_DEBUG */
-
+				if (vty->pass_fd >= 0) {
-				if (vty->pass_fd != -1) {
 					memset(vty->pass_fd_status, 0, 4);
 					vty->pass_fd_status[3] = ret;
 					vty->status = VTY_PASSFD;
@@ -2387,7 +2386,9 @@ static void vtysh_read(struct event *thread)
 					 * => skip vty_event(VTYSH_READ, vty)!
 					 */
 					return;
-				}
+				} else
+					/* normalize other invalid values */
+					vty->pass_fd = -1;
 
 				/* hack for asynchronous "write integrated"
 				 * - other commands in "buf" will be ditched

lib/zlog_5424.c

@@ -877,10 +877,15 @@ static int zlog_5424_open(struct zlog_cfg_5424 *zcf, int sock_type)
 
 	switch (zcf->dst) {
 	case ZLOG_5424_DST_NONE:
-		break;
+		return -1;
 
 	case ZLOG_5424_DST_FD:
 		fd = dup(zcf->fd);
+		if (fd < 0) {
+			flog_err_sys(EC_LIB_SYSTEM_CALL,
+				     "failed to dup() log file descriptor: %m (FD limit too low?)");
+			return -1;
+		}
 
 		optlen = sizeof(sock_type);
 		if (!getsockopt(fd, SOL_SOCKET, SO_TYPE, &sock_type, &optlen)) {
@@ -891,7 +896,7 @@ static int zlog_5424_open(struct zlog_cfg_5424 *zcf, int sock_type)
 
 	case ZLOG_5424_DST_FIFO:
 		if (!zcf->filename)
-			break;
+			return -1;
 
 		if (!zcf->file_nocreate) {
 			frr_with_privs (lib_privs) {
@@ -904,7 +909,7 @@ static int zlog_5424_open(struct zlog_cfg_5424 *zcf, int sock_type)
 			if (err == 0)
 				do_chown = true;
 			else if (errno != EEXIST)
-				break;
+				return -1;
 		}
 
 		flags = O_NONBLOCK;
@@ -912,7 +917,7 @@ static int zlog_5424_open(struct zlog_cfg_5424 *zcf, int sock_type)
 
 	case ZLOG_5424_DST_FILE:
 		if (!zcf->filename)
-			break;
+			return -1;
 
 		frr_with_privs (lib_privs) {
 			fd = open(zcf->filename, flags | O_WRONLY | O_APPEND |
@@ -924,7 +929,7 @@ static int zlog_5424_open(struct zlog_cfg_5424 *zcf, int sock_type)
 			flog_err_sys(EC_LIB_SYSTEM_CALL,
 				     "could not open log file %pSE: %m",
 				     zcf->filename);
-			break;
+			return -1;
 		}
 
 		frr_with_privs (lib_privs) {
@@ -952,11 +957,11 @@ static int zlog_5424_open(struct zlog_cfg_5424 *zcf, int sock_type)
 		flog_err_sys(EC_LIB_SYSTEM_CALL,
 			     "could not open or create log file %pSE: %m",
 			     zcf->filename);
-		break;
+		return -1;
 
 	case ZLOG_5424_DST_UNIX:
 		if (!zcf->filename)
-			break;
+			return -1;
 
 		memset(&sa, 0, sizeof(sa));
 		sa.sun_family = AF_UNIX;
@@ -988,6 +993,7 @@ static int zlog_5424_open(struct zlog_cfg_5424 *zcf, int sock_type)
 				"could not connect to log unix path %pSE: %m",
 				zcf->filename);
 			need_reconnect = true;
+			/* no return -1 here, trigger retry code below */
 		} else {
 			/* datagram sockets are connectionless, restarting
 			 * the receiver may lose some packets but will resume