xt-sys/exectos
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Harden BlpDuplicateDevicePath against malformed device paths
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Aiken Harris 2025-07-29 12:15:27 +02:00 committed by CodingWorkshop Signing Team
parent b0aabf96b8
commit 7fce778ee4
Signed by: CodingWorkshop Signing Team
GPG Key ID: 6DC88369C82795D2
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; EFI_STATUS Status;
UINT Length = 0; 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; DevicePathNode = DevicePath;
/* Get the device path length */ /* Get the device path length */
while(TRUE) while(TRUE)
{ {
Length += *(PUSHORT)DevicePath->Length; Length += *(PUSHORT)DevicePathNode->Length;
if(DevicePathNode->Type == EFI_END_DEVICE_PATH) if(DevicePathNode->Type == EFI_END_DEVICE_PATH)
{ {
break; break;
} }
DevicePathNode = (PEFI_DEVICE_PATH_PROTOCOL)((PUCHAR)DevicePathNode + *(PUSHORT)DevicePath->Length); DevicePathNode = (PEFI_DEVICE_PATH_PROTOCOL)((PUCHAR)DevicePathNode + *(PUSHORT)DevicePathNode->Length);
} }
/* Check length */ /* Check length */