[FFmpeg-cvslog] avcodec/mlpdec: Check max matrix instead of max channel in noise check

[Michael Niedermayer]

ffmpeg | branch: release/5.1 | Michael Niedermayer <michael at niedermayer.cc> | Mon Nov 21 22:59:55 2022 +0100| [7c5b975f6f6db05ed96ef0183539ea69cd4f82c9] | committer: Michael Niedermayer

avcodec/mlpdec: Check max matrix instead of max channel in noise check

This is a regression since: adaa06581c5444c94eef72d61b8166f096e2687a
Before this, max_channel and  max_matrix_channel where compared for equality

Fixes: out of array access
Fixes: 53340/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_TRUEHD_fuzzer-514959011885875

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit aa79560de5e9596ada0345e5d12aa00dbeddaaa6)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=7c5b975f6f6db05ed96ef0183539ea69cd4f82c9
---

 libavcodec/mlpdec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/mlpdec.c b/libavcodec/mlpdec.c
index caf35dca0e..6af63c4631 100644
--- a/libavcodec/mlpdec.c
+++ b/libavcodec/mlpdec.c
@@ -549,7 +549,7 @@ static int read_restart_header(MLPDecodeContext *m, GetBitContext *gbp,
 
     /* This should happen for TrueHD streams with >6 channels and MLP's noise
      * type. It is not yet known if this is allowed. */
-    if (max_channel > MAX_MATRIX_CHANNEL_MLP && !noise_type) {
+    if (max_matrix_channel > MAX_MATRIX_CHANNEL_MLP && !noise_type) {
         avpriv_request_sample(m->avctx,
                               "%d channels (more than the "
                               "maximum supported by the decoder)",