[FFmpeg-devel] [PATCH 2/9] avcodec/mpeg4audio: Check that there is enough space for the first 3 elements in ff_mpeg4audio_get_config_gb()

[Michael Niedermayer]

Fixes: out of array access
Fixes: 68863/clusterfuzz-testcase-minimized-ffmpeg_dem_IAMF_fuzzer-4833546039525376

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/mpeg4audio.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libavcodec/mpeg4audio.c b/libavcodec/mpeg4audio.c
index fbd2a8f811a..ae18944f0d5 100644
--- a/libavcodec/mpeg4audio.c
+++ b/libavcodec/mpeg4audio.c
@@ -94,6 +94,10 @@ int ff_mpeg4audio_get_config_gb(MPEG4AudioConfig *c, GetBitContext *gb,
 {
     int specific_config_bitindex, ret;
     int start_bit_index = get_bits_count(gb);
+
+    if (get_bits_left(gb) < 5+4+4)
+        return AVERROR_INVALIDDATA;
+
     c->object_type = get_object_type(gb);
     c->sample_rate = get_sample_rate(gb, &c->sampling_index);
     c->chan_config = get_bits(gb, 4);
-- 
2.45.2