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MdeModulePkg/UsbBusPei: Reject descriptor whose length is bad

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Today's implementation doesn't check whether the length of
descriptor is valid before using it.

The patch fixes this issue by syncing the similar fix to UsbBusDxe.
70c3c2370a2aefe71cf0f6c1a1e063f7d74e1d79
*MdeModulePkg/UsbBus: Reject descriptor whose length is bad

Additionally the patch also rejects the data when length is
larger than sizeof (PeiUsbDevice->ConfigurationData).

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
This commit is contained in:
Ruiyu Ni 2018-10-25 18:09:46 +08:00
parent c96de1dbae
commit 70425456da
1 changed files with 14 additions and 0 deletions
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14
MdeModulePkg/Bus/Usb/UsbBusPei/UsbPeim.c
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@ -816,6 +816,20 @@ PeiUsbGetAllConfiguration (
ConfigDesc = (EFI_USB_CONFIG_DESCRIPTOR *) PeiUsbDevice->ConfigurationData;
ConfigDescLength = ConfigDesc->TotalLength;
//
// Reject if TotalLength even cannot cover itself.
//
if (ConfigDescLength < OFFSET_OF (EFI_USB_CONFIG_DESCRIPTOR, TotalLength) + sizeof (ConfigDesc->TotalLength)) {
return EFI_DEVICE_ERROR;
}
//
// Reject if TotalLength exceeds the PeiUsbDevice->ConfigurationData.
//
if (ConfigDescLength > sizeof (PeiUsbDevice->ConfigurationData)) {
return EFI_DEVICE_ERROR;
}
//
// Then we get the total descriptors for this configuration
//