msvfw32: Lpckid and lpdwFlags must be valid memory addresses.

Otherwise codecs will crash while trying to write to it. Even though MSDN states that NULL is allowed for lpckid that is not true. Signed-off-by: Bruno Jesus <00cpxxx@gmail.com> Signed-off-by: Alexandre Julliard <julliard@winehq.org>

msvfw32: Lpckid and lpdwFlags must be valid memory addresses.
4cb36b9a · Bruno Jesus · Alexandre Julliard · d733e0d2 · 4cb36b9a
Commit 4cb36b9a authored Oct 20, 2015 by Bruno Jesus Committed by Alexandre Julliard Oct 21, 2015
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Showing with 8 additions and 3 deletions

msvideo_main.c dlls/msvfw32/msvideo_main.c +8 -3

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--- a/dlls/msvfw32/msvideo_main.c
+++ b/dlls/msvfw32/msvideo_main.c
@@ -1431,13 +1431,15 @@ BOOL VFWAPI ICSeqCompressFrameStart(PCOMPVARS pc, LPBITMAPINFO lpbiIn)
     * it doesn't appear to be used though
     */
    DWORD ret;
+    ICCOMPRESS* icComp;
    pc->lpbiIn = HeapAlloc(GetProcessHeap(), 0, sizeof(BITMAPINFO));
    if (!pc->lpbiIn)
        return FALSE;
    *pc->lpbiIn = *lpbiIn;
-    pc->lpState = HeapAlloc(GetProcessHeap(), 0, sizeof(ICCOMPRESS));
+    pc->lpState = HeapAlloc(GetProcessHeap(), 0, sizeof(ICCOMPRESS)
+                            + sizeof(*icComp->lpckid) + sizeof(*icComp->lpdwFlags));
    if (!pc->lpState)
        goto error;
@@ -1469,13 +1471,16 @@ BOOL VFWAPI ICSeqCompressFrameStart(PCOMPVARS pc, LPBITMAPINFO lpbiIn)
    TRACE(" -- %x\n", ret);
    if (ret == ICERR_OK)
    {
-       ICCOMPRESS* icComp = pc->lpState;
+        icComp = pc->lpState;
        /* Initialise some variables */
        pc->lFrame = 0; pc->lKeyCount = 0;
        icComp->lpbiOutput = &pc->lpbiOut->bmiHeader;
        icComp->lpbiInput = &pc->lpbiIn->bmiHeader;
-       icComp->lpckid = NULL;
+        icComp->lpckid = (DWORD *)(icComp + 1);
+        *icComp->lpckid = 0;
+        icComp->lpdwFlags = (DWORD *)((char *)(icComp + 1) + sizeof(*icComp->lpckid));
+        *icComp->lpdwFlags = 0;
        icComp->dwFrameSize = 0;
        icComp->dwQuality = pc->lQ;
        icComp->lpbiPrev = &pc->lpbiIn->bmiHeader;