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[NTOSKRNL] Fix a nullptr dereference in IopStartDevice

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Mark Jansen 2018-08-05 22:14:44 +02:00
parent 10c5bfb8fe
commit b2b1c054e4
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1 changed files with 5 additions and 2 deletions
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7
ntoskrnl/io/pnpmgr/pnpmgr.c
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@ -786,7 +786,7 @@ IopStartDevice(
{ {
NTSTATUS Status; NTSTATUS Status;
HANDLE InstanceHandle = NULL, ControlHandle = NULL; HANDLE InstanceHandle = NULL, ControlHandle = NULL;
UNICODE_STRING KeyName; UNICODE_STRING KeyName, ValueString;
OBJECT_ATTRIBUTES ObjectAttributes; OBJECT_ATTRIBUTES ObjectAttributes;
if (DeviceNode->Flags & DNF_DISABLED) if (DeviceNode->Flags & DNF_DISABLED)
@ -817,7 +817,10 @@ IopStartDevice(
goto ByeBye; goto ByeBye;
RtlInitUnicodeString(&KeyName, L"ActiveService"); RtlInitUnicodeString(&KeyName, L"ActiveService");
Status = ZwSetValueKey(ControlHandle, &KeyName, 0, REG_SZ, DeviceNode->ServiceName.Buffer, DeviceNode->ServiceName.Length + sizeof(UNICODE_NULL)); ValueString = DeviceNode->ServiceName;
if (!ValueString.Buffer)
RtlInitUnicodeString(&ValueString, L"");
Status = ZwSetValueKey(ControlHandle, &KeyName, 0, REG_SZ, ValueString.Buffer, ValueString.Length + sizeof(UNICODE_NULL));
// } // }
ByeBye: ByeBye: