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dm: usb: Avoid exceeding available array size for storage devices

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The limit on storage devices is USB_MAX_STOR_DEV but we use one extra
element while probing to see if a device is a storage device. Avoid this,
since it causes memory corruption.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Marek Vasut <marex@denx.de>
Tested-by: Stephen Warren <swarren@nvidia.com>
This commit is contained in:
Simon Glass 2016-02-29 15:25:53 -07:00
parent 2a981dc2c6
commit c89e79d419
1 changed files with 7 additions and 7 deletions
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14
common/usb_storage.c
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@ -176,6 +176,13 @@ static int usb_stor_probe_device(struct usb_device *dev)
if (dev == NULL) if (dev == NULL)
return -ENOENT; /* no more devices available */ return -ENOENT; /* no more devices available */
/* We don't have space to even probe if we hit the maximum */
if (usb_max_devs == USB_MAX_STOR_DEV) {
printf("max USB Storage Device reached: %d stopping\n",
usb_max_devs);
return -ENOSPC;
}
debug("\n\nProbing for storage\n"); debug("\n\nProbing for storage\n");
if (usb_storage_probe(dev, 0, &usb_stor[usb_max_devs])) { if (usb_storage_probe(dev, 0, &usb_stor[usb_max_devs])) {
/* OK, it's a storage device. Iterate over its LUNs /* OK, it's a storage device. Iterate over its LUNs
@ -210,13 +217,6 @@ static int usb_stor_probe_device(struct usb_device *dev)
} }
} }
/* if storage device */
if (usb_max_devs == USB_MAX_STOR_DEV) {
printf("max USB Storage Device reached: %d stopping\n",
usb_max_devs);
return -ENOSPC;
}
return 0; return 0;
} }