avformat/cafdec: Check channels

Fixes: signed integer overflow: -1184429040541376544 * 32 cannot be represented in type 'long'
Fixes: 31788/clusterfuzz-testcase-minimized-ffmpeg_dem_CAF_fuzzer-6236746338664448
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

diff --git a/libavformat/cafdec.c b/libavformat/cafdec.c
index 2a9299d777d1645dedee3173bdc95f022376af9a..d97ca45ab8fe703ae6d088de89f97b389ecd8e93 100644 (file)
--- a/libavformat/cafdec.c
+++ b/libavformat/cafdec.c
@@ -79,7 +79,7 @@ static int read_desc_chunk(AVFormatContext *s)
     st->codecpar->channels    = avio_rb32(pb);
     st->codecpar->bits_per_coded_sample = avio_rb32(pb);
 
-    if (caf->bytes_per_packet < 0 || caf->frames_per_packet < 0)
+    if (caf->bytes_per_packet < 0 || caf->frames_per_packet < 0 || st->codecpar->channels < 0)
         return AVERROR_INVALIDDATA;
 
     /* calculate bit rate for constant size packets */