Clean up some problems identified by Coverity.

bufferevent_sock.c

@@ -113,8 +113,9 @@ bufferevent_socket_outbuf_cb(struct evbuffer *buf,
 	    !bufev_p->write_suspended) {
 		/* Somebody added data to the buffer, and we would like to
 		 * write, and we were not writing.  So, start writing. */
-		be_socket_add(&bufev->ev_write, &bufev->timeout_write);
+		if (be_socket_add(&bufev->ev_write, &bufev->timeout_write) == -1) {
-		/* XXXX handle failure from be_socket_add */
+		    // Should we log this?
+		}
 	}
 }
 

evrpc.c

@@ -338,6 +338,7 @@ static void
 evrpc_request_cb_closure(void *arg, enum EVRPC_HOOK_RESULT hook_res)
 {
 	struct evrpc_req_generic *rpc_state = arg;
+	EVUTIL_ASSERT(rpc_state);
 	struct evrpc *rpc = rpc_state->rpc;
 	struct evhttp_request *req = rpc_state->http_req;
 
@@ -399,8 +400,13 @@ evrpc_request_done_closure(void *, enum EVRPC_HOOK_RESULT);
 void
 evrpc_request_done(struct evrpc_req_generic *rpc_state)
 {
-	struct evhttp_request *req = rpc_state->http_req;
+	struct evhttp_request *req;
-	struct evrpc *rpc = rpc_state->rpc;
+	struct evrpc *rpc;
+
+	EVUTIL_ASSERT(rpc_state);
+
+	req = rpc_state->http_req;
+	rpc = rpc_state->rpc;
 
 	if (rpc->reply_complete(rpc_state->reply) == -1) {
 		/* the reply was not completely filled in.  error out */
@@ -466,6 +472,7 @@ static void
 evrpc_request_done_closure(void *arg, enum EVRPC_HOOK_RESULT hook_res)
 {
 	struct evrpc_req_generic *rpc_state = arg;
+	EVUTIL_ASSERT(rpc_state);
 	struct evhttp_request *req = rpc_state->http_req;
 
 	if (hook_res == EVRPC_TERMINATE)

evutil.c

@@ -445,9 +445,9 @@ evutil_socket_connect(evutil_socket_t *fd_ptr, struct sockaddr *sa, int socklen)
 	int made_fd = 0;
 
 	if (*fd_ptr < 0) {
-		made_fd = 1;
 		if ((*fd_ptr = socket(sa->sa_family, SOCK_STREAM, 0)) < 0)
 			goto err;
+		made_fd = 1;
 		if (evutil_make_socket_nonblocking(*fd_ptr) < 0) {
 			goto err;
 		}

sample/dns-example.c

@@ -173,6 +173,10 @@ main(int c, char **v) {
 		evutil_socket_t sock;
 		struct sockaddr_in my_addr;
 		sock = socket(PF_INET, SOCK_DGRAM, 0);
+		if (sock == -1) {
+			perror("socket");
+			exit(1);
+		}
 		evutil_make_socket_nonblocking(sock);
 		my_addr.sin_family = AF_INET;
 		my_addr.sin_port = htons(10053);

sample/http-server.c

@@ -133,7 +133,8 @@ dump_request_cb(struct evhttp_request *req, void *arg)
 		int n;
 		char cbuf[128];
 		n = evbuffer_remove(buf, cbuf, sizeof(buf)-1);
-		fwrite(cbuf, 1, n, stdout);
+		if (n > 0)
+		    fwrite(cbuf, 1, n, stdout);
 	}
 	puts(">>>");
 
@@ -179,6 +180,8 @@ send_document_cb(struct evhttp_request *req, void *arg)
 
 	/* We need to decode it, to see what path the user really wanted. */
 	decoded_path = evhttp_uridecode(path, 0, NULL);
+	if (decoded_path == NULL)
+		goto err;
 	/* Don't allow any ".."s in the path, to avoid exposing stuff outside
 	 * of the docroot.  This test is both overzealous and underzealous:
 	 * it forbids aceptable paths like "/this/one..here", but it doesn't

test/bench_http.c

@@ -112,11 +112,20 @@ main(int argc, char **argv)
 		}
 
 		switch (c) {
+		char ** eptr;
 		case 'p':
-			port = atoi(argv[i+1]);
+			port = (int)strtol(argv[i+1], eptr, 10);
+			if (!(argv[i+1] && (**eptr == '\0'))) {
+				fprintf(stderr, "Bad port\n");
+				exit(1);
+			}
 			break;
 		case 'l':
-			content_len = atol(argv[i+1]);
+			content_len = (int)strtol(argv[i+1], eptr, 10);
+			if (!(argv[i+1] && (**eptr == '\0'))) {
+				fprintf(stderr, "Bad content length\n");
+				exit(1);
+			}
 			if (content_len == 0) {
 				fprintf(stderr, "Bad content length\n");
 				exit(1);