[FFmpeg-devel] [PATCH 2/4] avformat/rpl: Use 64bit in bitrate computation and check it

[Michael Niedermayer]

Fixes: signed integer overflow: 777777776 * 4 cannot be represented in type 'int'
Fixes: 29102/clusterfuzz-testcase-minimized-ffmpeg_dem_RPL_fuzzer-6726188921913344

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
---
 libavformat/rpl.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/libavformat/rpl.c b/libavformat/rpl.c
index b98488c7b1..558e5718ba 100644
--- a/libavformat/rpl.c
+++ b/libavformat/rpl.c
@@ -207,8 +207,10 @@ static int rpl_read_header(AVFormatContext *s)
             ast->codecpar->bits_per_coded_sample = 4;
 
         ast->codecpar->bit_rate = ast->codecpar->sample_rate *
-                                  ast->codecpar->bits_per_coded_sample *
-                                  ast->codecpar->channels;
+                                  (int64_t)ast->codecpar->bits_per_coded_sample;
+        if (ast->codecpar->bit_rate > INT64_MAX / ast->codecpar->channels)
+            return AVERROR_INVALIDDATA;
+        ast->codecpar->bit_rate *= ast->codecpar->channels;
 
         ast->codecpar->codec_id = AV_CODEC_ID_NONE;
         switch (audio_format) {
-- 
2.17.1