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avcodec/pngdec: Require a IHDR chunk before fctl 

This is required by the APNG spec

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2015-06-29 21:57:12 +02:00
parent 47f4e2d896
commit a1736926e9
1 changed files with 5 additions and 0 deletions
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5
libavcodec/pngdec.c
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@ -824,6 +824,11 @@ static int decode_fctl_chunk(AVCodecContext *avctx, PNGDecContext *s,
if (length != 26)
return AVERROR_INVALIDDATA;
if (!(s->state & PNG_IHDR)) {
av_log(avctx, AV_LOG_ERROR, "fctl before IHDR\n");
return AVERROR_INVALIDDATA;
}
s->last_w = s->cur_w;
s->last_h = s->cur_h;
s->last_x_offset = s->x_offset;