avcodec/hq_hqa: Check info size

Fixes: assertion failure
Fixes: 21079/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_HQ_HQA_fuzzer-5737046523248640
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

diff --git a/libavcodec/hq_hqa.c b/libavcodec/hq_hqa.c
index eec2e980b3a40aecd33db59b72955955683b9b76..8404e80ec8ed90a8971c1689b2248a9e7c82ecfa 100644 (file)
--- a/libavcodec/hq_hqa.c
+++ b/libavcodec/hq_hqa.c
@@ -321,7 +321,7 @@ static int hq_hqa_decode_frame(AVCodecContext *avctx, void *data,
         int info_size;
         bytestream2_skip(&ctx->gbc, 4);
         info_size = bytestream2_get_le32(&ctx->gbc);
-        if (bytestream2_get_bytes_left(&ctx->gbc) < info_size) {
+        if (info_size < 0 || bytestream2_get_bytes_left(&ctx->gbc) < info_size) {
             av_log(avctx, AV_LOG_ERROR, "Invalid INFO size (%d).\n", info_size);
             return AVERROR_INVALIDDATA;
         }