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cmd: usb: check if_type before using this device

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For legacy usb storage driver, USB_MAX_STOR_DEV is defined as 7.
If we only have one usb disk on board, `usb dev 0` is ok.
But if `usb dev 1`, still ok, then `usb read xxx` will trigger
system fault and reboot.

So check if_type before using this device.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Cc: Simon Glass <sjg@chromium.org>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Bin Meng <bmeng.cn@gmail.com>
Cc: Marek Vasut <marex@denx.de>
Cc: Stefan Roese <sr@denx.de>
Cc: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Cc: Peng Fan <peng.fan@nxp.com>
Cc: Stephen Warren <swarren@nvidia.com>
This commit is contained in:
Peng Fan 2016-06-17 14:18:11 +08:00 committed by Marek Vasut
parent ef53b8c4ce
commit 7839f5f809
1 changed files with 2 additions and 1 deletions
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3
cmd/usb.c
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@ -800,7 +800,8 @@ static int do_usb(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
int dev = (int)simple_strtoul(argv[2], NULL, 10);
printf("\nUSB device %d: ", dev);
stor_dev = blk_get_devnum_by_type(IF_TYPE_USB, dev);
if (stor_dev == NULL) {
if ((stor_dev == NULL) ||
(stor_dev->if_type == IF_TYPE_UNKNOWN)) {
printf("unknown device\n");
return 1;
}