CVE-2022-1924

DOS / potential heap overwrite in mkv demuxing using lzo decompression.
Integer overflow in matroskademux element in lzo decompression function
which causes a segfault, or could cause a heap overwrite, depending on libc
and OS. Depending on the libc used, and the underlying OS capabilities, it
could be just a segfault or a heap overwrite. If the libc uses mmap for
large chunks, and the OS supports mmap, then it is just a segfault (because
the realloc before the integer overflow will use mremap to reduce the size
of the chunk, and it will start to write to unmapped memory). However, if
using a libc implementation that does not use mmap, or if the OS does not
support mmap while using libc, then this could result in a heap overwrite.

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