Michael Müller : msvideo.dll16: Check if any 16 bit thunks have been allocated before accessing pointer.

[Alexandre Julliard]

Module: wine
Branch: stable
Commit: 81ee50fd6aa89e76df0a3852a0e10a25787e5cc4
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=81ee50fd6aa89e76df0a3852a0...

Author: Michael Müller 
Date:   Fri Feb  3 09:36:45 2017 +0100

msvideo.dll16: Check if any 16 bit thunks have been allocated before accessing pointer.

Signed-off-by: Michael Müller 
Signed-off-by: Sebastian Lackner 
Signed-off-by: Alexandre Julliard 
(cherry picked from commit ea7cc6fc553ba25fe8acfc6d5a694c54cdbf9c68)
Signed-off-by: Michael Stefaniuc

---

dlls/msvideo.dll16/msvideo16.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/dlls/msvideo.dll16/msvideo16.c b/dlls/msvideo.dll16/msvideo16.c
index 28f126c..d390020 100644
--- a/dlls/msvideo.dll16/msvideo16.c
+++ b/dlls/msvideo.dll16/msvideo16.c
@@ -771,6 +771,9 @@ static struct msvideo_thunk*    MSVIDEO_HasThunk(HIC16 hic)
 {
     struct msvideo_thunk* thunk;

+    if (!MSVIDEO_Thunks)
+        return NULL;
+
     for (thunk = MSVIDEO_Thunks; thunk < &MSVIDEO_Thunks[MAX_THUNKS]; thunk++)
     {
         if (thunk->hIC16 == hic) return thunk;