[Bug 776107] qtdemux: Access violation in __gst_fast_read_swap32

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=776107

--- Comment #3 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
__gst_fast_read_swap32() is used by GST_READ_UINT32_BE(). That's just reading a
32 bit integer in big endian order from some memory address, and swaps it into
native endianness. The problem is not that function, but that qtdemux is
calling it without checking that the memory there is actually readable.

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