[FFmpeg-cvslog] avcodec/mp3_header_decompress_bsf: Check sample_rate_index

[Michael Niedermayer]

ffmpeg | branch: release/2.8 | Michael Niedermayer <michael at niedermayer.cc> | Sat Dec 14 00:37:27 2019 +0100| [74673ba2762fc410ce806ba372614827dcd86619] | committer: Michael Niedermayer

avcodec/mp3_header_decompress_bsf: Check sample_rate_index

Fixes: out of array read
Fixes: 19309/clusterfuzz-testcase-minimized-ffmpeg_BSF_MP3_HEADER_DECOMPRESS_fuzzer-5651002950942720

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Paul B Mahol <onemda at gmail.com>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit f064c7c449f162a9011ad890f26ceeca26934d22)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=74673ba2762fc410ce806ba372614827dcd86619
---

 libavcodec/mp3_header_decompress_bsf.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libavcodec/mp3_header_decompress_bsf.c b/libavcodec/mp3_header_decompress_bsf.c
index 95c0b5b769..cd0b1e12fe 100644
--- a/libavcodec/mp3_header_decompress_bsf.c
+++ b/libavcodec/mp3_header_decompress_bsf.c
@@ -51,6 +51,10 @@ static int mp3_header_decompress(AVBitStreamFilterContext *bsfc, AVCodecContext
     lsf     = sample_rate < (24000+32000)/2;
     mpeg25  = sample_rate < (12000+16000)/2;
     sample_rate_index= (header>>10)&3;
+    if (sample_rate_index == 3) {
+        return AVERROR_INVALIDDATA;
+    }
+
     sample_rate= avpriv_mpa_freq_tab[sample_rate_index] >> (lsf + mpeg25); //in case sample rate is a little off
 
     for(bitrate_index=2; bitrate_index<30; bitrate_index++){