On Fri, Aug 02, 2019 at 07:19:11PM +0200, Michael Niedermayer wrote: > On Fri, Aug 02, 2019 at 10:46:04PM +1000, Peter Ross wrote: > > On Thu, Aug 01, 2019 at 11:44:39PM +0200, Michael Niedermayer wrote: > > > Fixes: Timeout (100sec -> 5sec) > > > Fixes: > > > 15073/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_VP7_fuzzer-5649257362620416 > > > > > > Untested as none of the vp7 samples i found executes this codepath > > > > see attached. its all i can find :( > > iam not sure iam making a mistake but these 2 files dont seem to execute > it
you are right michael. the samples attached have alpha/beta fade bits, but
they are both set to zero, therefore fade() is never called.
i dug up my old vp7-dev branch, and found alpha/beta were forced to specifically
test the fade path with those samples. e.g.:
int alpha = (int8_t) vp8_rac_get_uint(c, 8) + 1;
int beta = (int8_t) vp8_rac_get_uint(c, 8) + 1;
all my other vp7 samples stop before the alpha/beta frame bits.
also, this sample has alpha/beta set to non-zero, but was generated through
fuzzing and produces no video.
https://trac.ffmpeg.org/attachment/ticket/3501/vp7_1_f.avi
cheers,
-- Peter
(A907 E02F A6E5 0CD2 34CD 20D2 6760 79C5 AC40 DD6B)
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