Make sure that argv[] argument pointers are not modified.

[oweals/u-boot.git] / common / cmd_usb.c

diff --git a/common/cmd_usb.c b/common/cmd_usb.c
index 9de515c323b9642a35f61017cfa978ccb44d218c..73d74ac05586fc82bb9eb61e7ec5f8c9e271b455 100644 (file)
--- a/common/cmd_usb.c
+++ b/common/cmd_usb.c
@@ -349,7 +349,7 @@ void usb_show_tree(struct usb_device *dev)
  * usb boot command intepreter. Derived from diskboot
  */
 #ifdef CONFIG_USB_STORAGE
-int do_usbboot(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+int do_usbboot(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 {
        char *boot_device = NULL;
        char *ep;
@@ -387,7 +387,7 @@ int do_usbboot(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 
        dev = simple_strtoul(boot_device, &ep, 16);
        stor_dev = usb_stor_get_dev(dev);
-       if (stor_dev->type == DEV_TYPE_UNKNOWN) {
+       if (stor_dev == NULL || stor_dev->type == DEV_TYPE_UNKNOWN) {
                printf("\n** Device %d not available\n", dev);
                return 1;
        }
@@ -506,7 +506,7 @@ int do_usbboot(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 /******************************************************************************
  * usb command intepreter
  */
-int do_usb(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+int do_usb(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 {
 
        int i;
@@ -516,6 +516,11 @@ int do_usb(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
        block_dev_desc_t *stor_dev;
 #endif
 
+       if (argc < 2) {
+               cmd_usage(cmdtp);
+               return 1;
+       }
+
        if ((strncmp(argv[1], "reset", 5) == 0) ||
                 (strncmp(argv[1], "start", 5) == 0)) {
                usb_stop();
@@ -595,22 +600,25 @@ int do_usb(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
        if (strncmp(argv[1], "part", 4) == 0) {
                int devno, ok = 0;
                if (argc == 2) {
-                       for (devno = 0; devno < USB_MAX_STOR_DEV; ++devno) {
+                       for (devno = 0; ; ++devno) {
                                stor_dev = usb_stor_get_dev(devno);
+                               if (stor_dev == NULL)
+                                       break;
                                if (stor_dev->type != DEV_TYPE_UNKNOWN) {
                                        ok++;
                                        if (devno)
                                                printf("\n");
-                                       printf("print_part of %x\n", devno);
+                                       debug("print_part of %x\n", devno);
                                        print_part(stor_dev);
                                }
                        }
                } else {
                        devno = simple_strtoul(argv[2], NULL, 16);
                        stor_dev = usb_stor_get_dev(devno);
-                       if (stor_dev->type != DEV_TYPE_UNKNOWN) {
+                       if (stor_dev != NULL &&
+                           stor_dev->type != DEV_TYPE_UNKNOWN) {
                                ok++;
-                               printf("print_part of %x\n", devno);
+                               debug("print_part of %x\n", devno);
                                print_part(stor_dev);
                        }
                }
@@ -668,12 +676,12 @@ int do_usb(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
                if (argc == 3) {
                        int dev = (int)simple_strtoul(argv[2], NULL, 10);
                        printf("\nUSB device %d: ", dev);
-                       if (dev >= USB_MAX_STOR_DEV) {
+                       stor_dev = usb_stor_get_dev(dev);
+                       if (stor_dev == NULL) {
                                printf("unknown device\n");
                                return 1;
                        }
                        printf("\n    Device %d: ", dev);
-                       stor_dev = usb_stor_get_dev(dev);
                        dev_print(stor_dev);
                        if (stor_dev->type == DEV_TYPE_UNKNOWN)
                                return 1;