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avcodec/hnm4video: check intraframe size

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Fixes hypothetical integer overflow with HNM4_CHUNK_ID_IZ

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-11-22 16:54:01 +01:00
parent 6060234d43
commit 0398b7cbd3
1 changed files with 4 additions and 0 deletions
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4
libavcodec/hnm4video.c
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@ -373,6 +373,10 @@ static int hnm_decode_frame(AVCodecContext *avctx, void *data,
hnm_update_palette(avctx, avpkt->data, avpkt->size);
frame->palette_has_changed = 1;
} else if (chunk_id == HNM4_CHUNK_ID_IZ) {
if (avpkt->size < 12) {
av_log(avctx, AV_LOG_ERROR, "packet too small\n");
return AVERROR_INVALIDDATA;
}
unpack_intraframe(avctx, avpkt->data + 12, avpkt->size - 12);
memcpy(hnm->previous, hnm->current, hnm->width * hnm->height);
if (hnm->version == 0x4a)