vqavideo: check chunk sizes before reading chunks
Fixes out of array writes Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind Signed-off-by: NMichael Niedermayer <michaelni@gmx.at> (cherry picked from commit ab6c9332) Signed-off-by: NMichael Niedermayer <michaelni@gmx.at> (cherry picked from commit 13093f9767b922661132a3c1f4b5ba2c7338b660) CC: libav-stable@libav.org Signed-off-by: NReinhard Tartler <siretart@tauware.de>
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