avcodec/hnm4video: check that packetsize is at least 8

Fixes integer overflow and assertion failure
Fixes: signal_sigabrt_7ffff7126425_1243_CASSE.HNM

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

diff --git a/libavcodec/hnm4video.c b/libavcodec/hnm4video.c
index 1e3c0fd..d2c4ce3 100644 (file)
--- a/libavcodec/hnm4video.c
+++ b/libavcodec/hnm4video.c
@@ -359,6 +359,11 @@ static int hnm_decode_frame(AVCodecContext *avctx, void *data,
     int ret;
     uint16_t chunk_id;
 
+    if (avpkt->size < 8) {
+        av_log(avctx, AV_LOG_ERROR, "packet too small\n");
+        return AVERROR_INVALIDDATA;
+    }
+
     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
         return ret;