[FFmpeg-devel] [PATCH 2/7] avcodec/hcadec: do not allow code to continue after failed init

[Michael Niedermayer]

Fixes: 62285/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_HCA_fuzzer-6247136417087488
Fixes: out of array write

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
---
 libavcodec/hcadec.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/libavcodec/hcadec.c b/libavcodec/hcadec.c
index 8c8c235f7b3..88146c7cdd3 100644
--- a/libavcodec/hcadec.c
+++ b/libavcodec/hcadec.c
@@ -538,8 +538,10 @@ static int decode_frame(AVCodecContext *avctx, AVFrame *frame,
             return AVERROR_INVALIDDATA;
         } else if (AV_RB16(avpkt->data + 6) <= avpkt->size) {
             ret = init_hca(avctx, avpkt->data, AV_RB16(avpkt->data + 6));
-            if (ret < 0)
+            if (ret < 0) {
+                c->crc_table = NULL; // signal that init has not finished
                 return ret;
+            }
             offset = AV_RB16(avpkt->data + 6);
             if (offset == avpkt->size)
                 return avpkt->size;
-- 
2.17.1