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Harden BlpDuplicateDevicePath against malformed device paths

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This commit is contained in:
Aiken Harris
2025-07-29 12:15:27 +02:00
committed by CodingWorkshop Signing Team
parent b0aabf96b8
commit 7fce778ee4
1 changed files with 10 additions and 2 deletions
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12
xtldr/volume.c
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@@ -927,17 +927,25 @@ BlpDuplicateDevicePath(IN PEFI_DEVICE_PATH_PROTOCOL DevicePath)
EFI_STATUS Status;
UINT Length = 0;
/* Check if the input device path is NULL */
if(!DevicePath)
{
/* Nothing to duplicate */
return NULL;
}
/* Start iterating from the beginning of the device path */
DevicePathNode = DevicePath;
/* Get the device path length */
while(TRUE)
{
Length += *(PUSHORT)DevicePath->Length;
Length += *(PUSHORT)DevicePathNode->Length;
if(DevicePathNode->Type == EFI_END_DEVICE_PATH)
{
break;
}
DevicePathNode = (PEFI_DEVICE_PATH_PROTOCOL)((PUCHAR)DevicePathNode + *(PUSHORT)DevicePath->Length);
DevicePathNode = (PEFI_DEVICE_PATH_PROTOCOL)((PUCHAR)DevicePathNode + *(PUSHORT)DevicePathNode->Length);
}
/* Check length */