fix missing tests on malloc() return

libnfc/buses/uart_posix.c

@@ -130,6 +130,10 @@ uart_flush_input(serial_port sp)
     return;
   }
   char *rx = malloc(available_bytes_count);
+  if (!rx) {
+    perror("malloc");
+    return;
+  }
   // There is something available, read the data
   (void)read(UART_DATA(sp)->fd, rx, available_bytes_count);
   log_put(LOG_GROUP, LOG_CATEGORY, NFC_LOG_PRIORITY_DEBUG, "%d bytes have eatten.", available_bytes_count);
@@ -338,6 +342,10 @@ char **
 uart_list_ports(void)
 {
   char **res = malloc(sizeof(char *));
+  if (!res) {
+    perror("malloc");
+    return res;
+  }
   size_t szRes = 1;
 
   res[0] = NULL;

libnfc/buses/uart_win32.c

@@ -250,11 +250,19 @@ char **
 uart_list_ports(void)
 {
   char **availablePorts = malloc((1 + MAX_SERIAL_PORT_WIN) * sizeof(char *));
+  if (!availablePorts) {
+    perror("malloc");
+    return availablePorts;
+  }
   int curIndex = 0;
   int i;
   for (i = 1; i <= MAX_SERIAL_PORT_WIN; i++) {
     if (is_port_available(i)) {
       availablePorts[curIndex] = (char *)malloc(10);
+      if (!availablePorts[curIndex]) {
+        perror("malloc");
+        break;
+      }
       sprintf(availablePorts[curIndex], "COM%d", i);
       // printf("found candidate port: %s\n", availablePorts[curIndex]);
       curIndex++;

libnfc/chips/pn53x.c

@@ -3097,6 +3097,7 @@ pn53x_current_target_new(const struct nfc_device *pnd, const nfc_target *pnt)
     free(CHIP_DATA(pnd)->current_target);
   }
   CHIP_DATA(pnd)->current_target = malloc(sizeof(nfc_target));
+  // TODO: test malloc
   memcpy(CHIP_DATA(pnd)->current_target, pnt, sizeof(nfc_target));
 }