ntdll: Check for NULL context in NtGetContextThread.

Crash Bandicoot N. Sane Trilogy calls NtGetContextThread with the context being set to NULL which leads to a crash. Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=45428Signed-off-by: Johannes Brandstätter <jbrandst@2ds.eu> Signed-off-by: Alexandre Julliard <julliard@winehq.org>

ntdll: Check for NULL context in NtGetContextThread.
ec418e7f · Johannes Brandstätter · Alexandre Julliard · 95c21f3f · ec418e7f
Commit ec418e7f authored Jul 11, 2018 by Johannes Brandstätter Committed by Alexandre Julliard Jul 12, 2018
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signal_x86_64.c dlls/ntdll/signal_x86_64.c +5 -1

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--- a/dlls/ntdll/signal_x86_64.c
+++ b/dlls/ntdll/signal_x86_64.c
@@ -2160,9 +2160,13 @@ NTSTATUS WINAPI NtSetContextThread( HANDLE handle, const CONTEXT *context )
 NTSTATUS WINAPI NtGetContextThread( HANDLE handle, CONTEXT *context )
 {
    NTSTATUS ret;
-    DWORD needed_flags = context->ContextFlags;
+    DWORD needed_flags;
    BOOL self = (handle == GetCurrentThread());

+    if (!context) return STATUS_INVALID_PARAMETER;
+
+    needed_flags = context->ContextFlags;
+
    /* debug registers require a server call */
    if (context->ContextFlags & (CONTEXT_DEBUG_REGISTERS & ~CONTEXT_AMD64)) self = FALSE;