• Ronald S. Bultje's avatar
    matroska: don't overwrite string values until read/alloc was succesful. · cd40c31e
    Ronald S. Bultje authored
    This prevents certain tags with a default value assigned to them (as per
    the EBML syntax elements) from ever being assigned a NULL value. Other
    parts of the code rely on these being non-NULL (i.e. they don't check for
    NULL before e.g. using the string in strcmp() or similar), and thus in
    effect this prevents crashes when reading of such specific tags fails,
    either because of low memory or because of targeted file corruption.
    
    Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
    CC: libav-stable@libav.org
    cd40c31e
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