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Date: Thu, 4 Feb 2021 16:22:41 +0800
From: houjingyi <>
Subject: [FD] null pointer deference in mfmp4srcsnk.dll in latest windows 10

Found a null pointer deference in mfmp4srcsnk.dll in latest windows 10 by

Download mov file here:

Your explorer will crash. If not use windows media player.

(2788.3588): Access violation - code c0000005 (first chance)
First chance exceptions are reported before any exception handling.
This exception may be expected and handled.
eax=00000000 ebx=180bced8 ecx=5aaa2e20 edx=44445111 esi=5aaa2e20
eip=5aa7d16e esp=1793f374 ebp=1793f3b4 iopl=0         nv up ei pl zr na pe
cs=0023  ss=002b  ds=002b  es=002b  fs=0053  gs=002b
5aa7d16e 8b08            mov     ecx,dword ptr [eax]

I know MSRC usually do not fix null pointer deference but I reported to
them just in case. And as I expected they closed the case.

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