ntdll: Only set owned bits in RTL_BITMAP.

Signed-off-by: Michał Janiszewski <janisozaur@gmail.com> Signed-off-by: Alexandre Julliard <julliard@winehq.org>

ntdll: Only set owned bits in RTL_BITMAP.
a1ed5008 · Michał Janiszewski · Alexandre Julliard · 355f6b24 · a1ed5008
Commit a1ed5008 authored Jul 01, 2018 by Michał Janiszewski Committed by Alexandre Julliard Jul 03, 2018
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rtlbitmap.c dlls/ntdll/rtlbitmap.c +4 -4

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--- a/dlls/ntdll/rtlbitmap.c
+++ b/dlls/ntdll/rtlbitmap.c
@@ -156,8 +156,8 @@ VOID WINAPI RtlSetBits(PRTL_BITMAP lpBits, ULONG ulStart, ULONG ulCount)
      /* Set from the start bit, possibly into the next byte also */
      USHORT initialWord = NTDLL_maskBits[ulCount] << (ulStart & 7);
-      *lpOut++ |= (initialWord & 0xff);
+      *lpOut |= (initialWord & 0xff);
-      *lpOut |= (initialWord >> 8);
+      if (initialWord >> 8) lpOut[1] |= (initialWord >> 8);
      return;
    }
  }
@@ -217,8 +217,8 @@ VOID WINAPI RtlClearBits(PRTL_BITMAP lpBits, ULONG ulStart, ULONG ulCount)
      /* Clear from the start bit, possibly into the next byte also */
      USHORT initialWord = ~(NTDLL_maskBits[ulCount] << (ulStart & 7));
-      *lpOut++ &= (initialWord & 0xff);
+      *lpOut &= (initialWord & 0xff);
-      *lpOut &= (initialWord >> 8);
+      if ((initialWord >> 8) != 0xff) lpOut[1] &= (initialWord >> 8);
      return;
    }
  }