avcodec/hevc_cabac: Check prefix so as to avoid invalid shifts in coeff_abs_level_rem...
authorMichael Niedermayer <michael@niedermayer.cc>
Mon, 15 Jan 2018 22:46:44 +0000 (23:46 +0100)
committerMichael Niedermayer <michael@niedermayer.cc>
Wed, 31 Jan 2018 22:47:15 +0000 (23:47 +0100)
commitc740f585a183abccd0ffc9cce67989b4bb0d08b9
tree6a0bf65788ed4dfbe9c6302e7627fb8f5c154d50
parentc1f7b2b6e18acf0b24fcac32027e5ca45e3b5945
avcodec/hevc_cabac: Check prefix so as to avoid invalid shifts in coeff_abs_level_remaining_decode()

I suspect that this can be limited tighter, but i failed to find anything
in the spec that would confirm that.

Fixes: 4833/clusterfuzz-testcase-minimized-5302840101699584
Fixes: runtime error: left shift of 134217730 by 4 places cannot be represented in type 'int'

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit a026a3efaeb9c2026668dccbbda339a21ab3206b)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
libavcodec/hevc_cabac.c