[FFmpeg-devel] [PATCH 2/4] avcodec/hcadec: Check total_band_count against imdct_in size

[Michael Niedermayer]

Fixes: index 128 out of bounds for type 'float [128]'
Fixes: 23465/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_HCA_fuzzer-5089866596745216

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, 4 insertions(+)

diff --git a/libavcodec/hcadec.c b/libavcodec/hcadec.c
index 28e7d07cec..11cb157277 100644
--- a/libavcodec/hcadec.c
+++ b/libavcodec/hcadec.c
@@ -157,6 +157,10 @@ static av_cold int decode_init(AVCodecContext *avctx)
     } else
         return AVERROR_INVALIDDATA;
 
+    if (c->total_band_count > FF_ARRAY_ELEMS(c->ch->imdct_in))
+        return AVERROR_INVALIDDATA;
+
+
     while (get_bits_left(gb) >= 32) {
         chunk = get_bits_long(gb, 32);
         if (chunk == MKBETAG('v', 'b', 'r', 0)) {
-- 
2.17.1