Module: wine Branch: master Commit: 27afc0d3ab728be671ce387263db3f50aeeb0821 URL: https://source.winehq.org/git/wine.git/?a=commit;h=27afc0d3ab728be671ce38726...
Author: John Chadwick john@jchw.io Date: Sun Nov 17 14:26:40 2019 -0800
wintab32: Use 64-bit math in ScaleForContext.
With some tablet configurations, the InExt value passed to ScaleForContext can be very large, leading to an integer overflow.
Signed-off-by: John Chadwick john@jchw.io Signed-off-by: Alexandre Julliard julliard@winehq.org
---
dlls/wintab32/context.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/dlls/wintab32/context.c b/dlls/wintab32/context.c index 0514dd78b4..ff9a4ca677 100644 --- a/dlls/wintab32/context.c +++ b/dlls/wintab32/context.c @@ -178,9 +178,9 @@ int TABLET_PostTabletMessage(LPOPENCONTEXT newcontext, UINT msg, WPARAM wParam, static inline DWORD ScaleForContext(DWORD In, LONG InOrg, LONG InExt, LONG OutOrg, LONG OutExt) { if (((InExt > 0 )&&(OutExt > 0)) || ((InExt<0) && (OutExt < 0))) - return ((In - InOrg) * abs(OutExt) / abs(InExt)) + OutOrg; + return MulDiv(In - InOrg, abs(OutExt), abs(InExt)) + OutOrg; else - return ((abs(InExt) - (In - InOrg))*abs(OutExt) / abs(InExt)) + OutOrg; + return MulDiv(abs(InExt) - (In - InOrg), abs(OutExt), abs(InExt)) + OutOrg; }
LPOPENCONTEXT AddPacketToContextQueue(LPWTPACKET packet, HWND hwnd)