alsdec: validate time diff index n2.5.6
authorAndreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
Sat, 18 Apr 2015 18:09:28 +0000 (20:09 +0200)
committerMichael Niedermayer <michaelni@gmx.at>
Sat, 18 Apr 2015 23:27:04 +0000 (01:27 +0200)
commitfaac8e43315dae5818816bcebe52d11777b064b2
treed625bbe4f8fda2a27ebb24662479c825a2c90e35
parent5be683d687b6b2b697d34274d7ae56af3f047549
alsdec: validate time diff index

If begin is smaller than t, the subtraction 'begin -= t' wraps around,
because begin is unsigned. The same applies for end < t.

This causes segmentation faults.

Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit faf9fe2c224ea81a98afd53e2f0be0a2e13aeca9)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
libavcodec/alsdec.c