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[TCPIP] Fix buffer sizes in ReadIpConfiguration.

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This commit is contained in:
Thomas Faber
2018-01-08 13:58:20 +01:00
parent d87786bf6c
commit f54fb980ba
1 changed files with 12 additions and 8 deletions
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20
drivers/network/tcpip/datalink/lan.c
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@@ -570,6 +570,7 @@ BOOLEAN ReadIpConfiguration(PIP_INTERFACE Interface)
OBJECT_ATTRIBUTES ObjectAttributes;
HANDLE ParameterHandle;
PKEY_VALUE_PARTIAL_INFORMATION KeyValueInfo;
ULONG KeyValueInfoLength;
WCHAR Buffer[150];
UNICODE_STRING IPAddress = RTL_CONSTANT_STRING(L"IPAddress");
UNICODE_STRING Netmask = RTL_CONSTANT_STRING(L"SubnetMask");
@@ -608,31 +609,34 @@ BOOLEAN ReadIpConfiguration(PIP_INTERFACE Interface)
}
else
{
KeyValueInfo = ExAllocatePoolWithTag(PagedPool, sizeof(KEY_VALUE_PARTIAL_INFORMATION) + 16 * sizeof(WCHAR), KEY_VALUE_TAG);
KeyValueInfoLength = FIELD_OFFSET(KEY_VALUE_PARTIAL_INFORMATION, Data) + 16 * sizeof(WCHAR);
KeyValueInfo = ExAllocatePoolWithTag(PagedPool,
KeyValueInfoLength,
KEY_VALUE_TAG);
if (!KeyValueInfo)
{
ZwClose(ParameterHandle);
return FALSE;
}
/* Read the EnableDHCP entry */
Status = ZwQueryValueKey(ParameterHandle,
&EnableDhcp,
KeyValuePartialInformation,
KeyValueInfo,
sizeof(KEY_VALUE_PARTIAL_INFORMATION) + sizeof(ULONG),
KeyValueInfoLength,
&Unused);
if (NT_SUCCESS(Status) && KeyValueInfo->DataLength == sizeof(ULONG) && (*(PULONG)KeyValueInfo->Data) == 0)
{
RegistryDataU.MaximumLength = 16 + sizeof(WCHAR);
RegistryDataU.MaximumLength = KeyValueInfoLength - FIELD_OFFSET(KEY_VALUE_PARTIAL_INFORMATION, Data);
RegistryDataU.Buffer = (PWCHAR)KeyValueInfo->Data;
/* Read the IP address */
Status = ZwQueryValueKey(ParameterHandle,
&IPAddress,
KeyValuePartialInformation,
KeyValueInfo,
sizeof(KEY_VALUE_PARTIAL_INFORMATION) + 16 * sizeof(WCHAR),
KeyValueInfoLength,
&Unused);
if (NT_SUCCESS(Status))
{
@@ -653,7 +657,7 @@ BOOLEAN ReadIpConfiguration(PIP_INTERFACE Interface)
&Netmask,
KeyValuePartialInformation,
KeyValueInfo,
sizeof(KEY_VALUE_PARTIAL_INFORMATION) + 16 * sizeof(WCHAR),
KeyValueInfoLength,
&Unused);
if (NT_SUCCESS(Status))
{
@@ -682,7 +686,7 @@ BOOLEAN ReadIpConfiguration(PIP_INTERFACE Interface)
&Gateway,
KeyValuePartialInformation,
KeyValueInfo,
sizeof(KEY_VALUE_PARTIAL_INFORMATION) + 16 * sizeof(WCHAR),
KeyValueInfoLength,
&Unused);
if (NT_SUCCESS(Status))
{