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avcodec/cngdec: Check skip_samples 

Without this its possible to make the new decode API decode billions of samples
out of a empty input and never return to the caller before all samples have been
created and discarded.

Fixes: Timeout
Fixes: 2992/clusterfuzz-testcase-6649611793989632

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-08-17 23:40:45 +02:00
parent 0c9d5b015c
commit e7b9d136a1
1 changed files with 6 additions and 0 deletions
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6
libavcodec/cngdec.c
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@ -23,6 +23,7 @@
#include "libavutil/common.h"
#include "libavutil/ffmath.h"
#include "libavutil/intreadwrite.h"
#include "avcodec.h"
#include "celp_filters.h"
#include "internal.h"
@ -120,6 +121,11 @@ static int cng_decode_frame(AVCodecContext *avctx, void *data,
}
}
if (avctx->internal->skip_samples > 10 * avctx->frame_size) {
avctx->internal->skip_samples = 0;
return AVERROR_INVALIDDATA;
}
if (p->inited) {
p->energy = p->energy / 2 + p->target_energy / 2;
for (i = 0; i < p->order; i++)