alsdec: check block length

Fix writing over the end

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Addresses: CVE-2013-0845
(cherry picked from commit 2a0fb7286d67c47e44aa76c237ede117b22af616)

Signed-off-by: Reinhard Tartler <siretart@tauware.de>
(cherry picked from commit 3f7d89034bfe50893927cc92ddcb95a2e9b4178d)
Signed-off-by: Reinhard Tartler <siretart@tauware.de>
qdm2: check array index before use, fix out of array accesses

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

(cherry picked from commit a7ee6281f7ef1c29284e3a4cadfe0f227ffde1ed)

CC: libav-stable@libav.org

Signed-off-by: Reinhard Tartler <siretart@tauware.de>
(cherry picked from commit 39bec05ed42e505d17877b0c23f16322f9b5883b)

Signed-off-by: Reinhard Tartler <siretart@tauware.de>
(cherry picked from commit 0b2b8ab979624b0cce673d5e99255482d7c553ad)
Signed-off-by: Reinhard Tartler <siretart@tauware.de>
roqvideodec: check dimensions validity

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 3ae610451170cd5a28b33950006ff0bd23036845)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit fee26d352a52eb9f7fcd8d9167fb4a5ba015b612)

CC: libav-stable@libav.org

Signed-off-by: Reinhard Tartler <siretart@tauware.de>
(cherry picked from commit 488f87be873506abb01d67708a67c10a4dd29283)

Signed-off-by: Reinhard Tartler <siretart@tauware.de>
(cherry picked from commit 52b18c1fde65efac7f6e6104b76d39bf8d0a34ee)
Signed-off-by: Reinhard Tartler <siretart@tauware.de>
Prepare for 0.8.10 Release