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[UMPNPMGR] Move device id generation into a separate function and limit device instance number

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This commit is contained in:
Eric Kohl 2022-04-18 14:14:11 +02:00
parent 426687becf
commit f63e8f8a03
1 changed files with 49 additions and 30 deletions
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79
base/services/umpnpmgr/rpcserver.c
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@ -2983,6 +2983,51 @@ CreateDeviceInstance(LPWSTR pszDeviceID)
} }
static
CONFIGRET
GenerateDeviceID(
_Inout_ LPWSTR pszDeviceID,
_In_ PNP_RPC_STRING_LEN ulLength)
{
WCHAR szGeneratedInstance[MAX_DEVICE_ID_LEN];
HKEY hKey;
DWORD dwInstanceNumber;
DWORD dwError = ERROR_SUCCESS;
CONFIGRET ret = CR_SUCCESS;
/* Generated ID is: Root\<Device ID>\<Instance number> */
dwInstanceNumber = 0;
while (dwError == ERROR_SUCCESS)
{
if (dwInstanceNumber >= 10000)
return CR_FAILURE;
swprintf(szGeneratedInstance, L"Root\\%ls\\%04lu",
pszDeviceID, dwInstanceNumber);
/* Try to open the enum key of the device instance */
dwError = RegOpenKeyEx(hEnumKey, szGeneratedInstance, 0, KEY_QUERY_VALUE, &hKey);
if (dwError == ERROR_SUCCESS)
{
RegCloseKey(hKey);
dwInstanceNumber++;
}
}
/* pszDeviceID is an out parameter too for generated IDs */
if (wcslen(szGeneratedInstance) > ulLength)
{
ret = CR_BUFFER_SMALL;
}
else
{
wcscpy(pszDeviceID, szGeneratedInstance);
}
return ret;
}
/* Function 28 */ /* Function 28 */
DWORD DWORD
WINAPI WINAPI
@ -3010,36 +3055,10 @@ PNP_CreateDevInst(
if (ulFlags & CM_CREATE_DEVNODE_GENERATE_ID) if (ulFlags & CM_CREATE_DEVNODE_GENERATE_ID)
{ {
WCHAR szGeneratedInstance[MAX_DEVICE_ID_LEN]; ret = GenerateDeviceID(pszDeviceID,
DWORD dwInstanceNumber; ulLength);
DWORD dwError = ERROR_SUCCESS; if (ret != CR_SUCCESS)
HKEY hKey; return ret;
/* Generated ID is: Root\<Device ID>\<Instance number> */
dwInstanceNumber = 0;
while (dwError == ERROR_SUCCESS)
{
swprintf(szGeneratedInstance, L"Root\\%ls\\%04lu",
pszDeviceID, dwInstanceNumber);
/* Try to open the enum key of the device instance */
dwError = RegOpenKeyEx(hEnumKey, szGeneratedInstance, 0, KEY_QUERY_VALUE, &hKey);
if (dwError == ERROR_SUCCESS)
{
RegCloseKey(hKey);
dwInstanceNumber++;
}
}
/* pszDeviceID is an out parameter too for generated IDs */
if (wcslen(szGeneratedInstance) > ulLength)
{
ret = CR_BUFFER_SMALL;
}
else
{
wcscpy(pszDeviceID, szGeneratedInstance);
}
} }
/* Create the device instance */ /* Create the device instance */