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api: check that GUID is valid before assuming it's in use

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ROOT/NET/000X could have been claimed by a different driver, so we want
to double check.

Link: https://lists.zx2c4.com/pipermail/wireguard/2021-May/006716.html
Reported-by: Piotr Sobczak <piotrs@glosol.com>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld 2021-05-10 11:02:31 +02:00
parent d9555bea1b
commit 1efbd14c2c
1 changed files with 7 additions and 2 deletions
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9
api/adapter.c
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@ -1452,8 +1452,13 @@ static _Return_type_success_(return != NULL) WINTUN_ADAPTER *CreateAdapter(
if (RegOpenKeyExW(HKEY_LOCAL_MACHINE, RegPath, 0, KEY_QUERY_VALUE, &Key) == ERROR_SUCCESS)
{
RegCloseKey(Key);
SetLastError(LOG_ERROR(ERROR_ALREADY_EXISTS, L"Requested GUID is already in use: %s", RequestedGUIDStr));
return NULL;
NET_LUID Luid;
if (ConvertInterfaceGuidToLuid(RequestedGUID, &Luid) == NO_ERROR)
{
SetLastError(
LOG_ERROR(ERROR_ALREADY_EXISTS, L"Requested GUID is already in use: %s", RequestedGUIDStr));
return NULL;
}
}
LOG(WINTUN_LOG_WARN, L"Requested GUID %s has leftover residue", RequestedGUIDStr);
HANDLE OriginalToken;