[tkreuzer] 50826: [WIN32K] NtGdiStretchDIBitsInternal: don't call NtGdiGetDCObject and NtGdiCreateCompatibleDC with a dc locked. These cases are not harmful, but generally Nt* and Gre* should never...

Author: tkreuzer
Date: Sat Feb 19 22:29:31 2011
New Revision: 50826
URL: http://svn.reactos.org/svn/reactos?rev=50826&view=rev
Log:
[WIN32K]
NtGdiStretchDIBitsInternal: don't call NtGdiGetDCObject and NtGdiCreateCompatibleDC
with a dc locked. These cases are not harmful, but generally Nt* and Gre* should never be
called with an exclusive gdi lock held. Also don't return in failure case with the dc
still locked.
Modified:
    trunk/reactos/subsystems/win32/win32k/objects/dibobj.c
Modified: trunk/reactos/subsystems/win32/win32k/objects/dibobj.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/subsystems/win32/win32k/ob…
==============================================================================
--- trunk/reactos/subsystems/win32/win32k/objects/dibobj.c [iso-8859-1] (original)
+++ trunk/reactos/subsystems/win32/win32k/objects/dibobj.c [iso-8859-1] Sat Feb 19
22:29:31 2011
@@ -1043,13 +1043,6 @@
         return 0;
     }
-    if (!(pdc = DC_LockDc(hDC)))
-    {
-        ExFreePoolWithTag(safeBits, TAG_DIB);
-        EngSetLastError(ERROR_INVALID_HANDLE);
-        return 0;
-    }
-
     _SEH2_TRY
     {
         ProbeForRead(BitsInfo, cjMaxInfo, 1);
@@ -1075,6 +1068,13 @@
     }
     hBitmap = NtGdiGetDCObject(hDC, OBJ_BITMAP);
+
+    if (!(pdc = DC_LockDc(hDC)))
+    {
+        ExFreePoolWithTag(safeBits, TAG_DIB);
+        EngSetLastError(ERROR_INVALID_HANDLE);
+        return 0;
+    }
     if (XDest == 0 && YDest == 0 && XSrc == 0 && XSrc == 0
&&
         DestWidth == SrcWidth && DestHeight == SrcHeight &&
@@ -1091,14 +1091,17 @@
         {
             /* fast path */
             ret = IntSetDIBits(pdc, hBitmap, 0, height, safeBits, BitsInfo, Usage);
+            DC_UnlockDc(pdc);
             goto cleanup;
         }
     }
     /* slow path - need to use StretchBlt */
+    hBitmap = DIB_CreateDIBSection(pdc, BitsInfo, Usage, &pvBits, NULL, 0, 0);
+    DC_UnlockDc(pdc);
+
     hdcMem = NtGdiCreateCompatibleDC(hDC);
-    hBitmap = DIB_CreateDIBSection(pdc, BitsInfo, Usage, &pvBits, NULL, 0, 0);
     if(!hBitmap)
     {
         DPRINT1("Error, failed to create a DIB section\n");
@@ -1123,7 +1126,6 @@
 cleanup:
     ExFreePoolWithTag(safeBits, TAG_DIB);
-    DC_UnlockDc(pdc);
     return ret;
 }