[PATCH v4 3/4] ntdll: NtContinueEx() handle few error cases

[Dāvis Mosāns]

From: Dāvis Mosāns

context and options must be aligned
---
 dlls/ntdll/unix/server.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/dlls/ntdll/unix/server.c b/dlls/ntdll/unix/server.c
index b93021aaf19..2fe42809581 100644
--- a/dlls/ntdll/unix/server.c
+++ b/dlls/ntdll/unix/server.c
@@ -803,12 +803,28 @@ NTSTATUS WINAPI NtContinueEx( CONTEXT *context, CONTINUE_OPTIONS *options )
     user_apc_t apc;
     NTSTATUS status;
     BOOLEAN alertable;
+    const intptr_t alignment_bits = 16 - 1; /* (16-bytes on amd64) */
+
+    if (!context)
+    {
+        return STATUS_ACCESS_VIOLATION;
+    }
+
+    /* context must be aligned */
+    if ((intptr_t)context & alignment_bits)
+    {
+        return STATUS_DATATYPE_MISALIGNMENT;
+    }

if (options <= (CONTINUE_OPTIONS *)0xff)
     {
         alertable = (BOOLEAN)(intptr_t)options;
     } else
     {
+        if ((intptr_t)options & alignment_bits)
+        {
+            return STATUS_DATATYPE_MISALIGNMENT;
+        }
         alertable = !!(options->ContinueFlags & CONTINUE_FLAG_TEST_ALERT);

/* FIXME: no idea how to handle rest of CONTINUE_OPTIONS stuff */