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-rw-r--r--kernel/tools/usb/usbip/src/usbip_detach.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/kernel/tools/usb/usbip/src/usbip_detach.c b/kernel/tools/usb/usbip/src/usbip_detach.c
index 05c6d1585..9db9d21bb 100644
--- a/kernel/tools/usb/usbip/src/usbip_detach.c
+++ b/kernel/tools/usb/usbip/src/usbip_detach.c
@@ -47,7 +47,9 @@ static int detach_port(char *port)
uint8_t portnum;
char path[PATH_MAX+1];
- for (unsigned int i = 0; i < strlen(port); i++)
+ unsigned int port_len = strlen(port);
+
+ for (unsigned int i = 0; i < port_len; i++)
if (!isdigit(port[i])) {
err("invalid port %s", port);
return -1;