alsdec: validate time diff index
authorAndreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
Sat, 18 Apr 2015 18:09:28 +0000 (20:09 +0200)
committerMichael Niedermayer <michaelni@gmx.at>
Wed, 22 Apr 2015 10:27:25 +0000 (12:27 +0200)
commitd18f8959b3c6374846c83ec28f1761e8e3253929
tree14083b5f78e9da00af7f15af8e1e3baff23077dc
parent455bc87c8f00abbcb2dd305b677bbe56140bd5f4
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