[FFmpeg-devel] [PATCH 1/3] avformat/cafdec: sanity check channels and bps

[Michael Niedermayer]

Fixes: Timeout
Fixes: 67044/clusterfuzz-testcase-minimized-ffmpeg_dem_CAF_fuzzer-5791144363491328

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/cafdec.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libavformat/cafdec.c b/libavformat/cafdec.c
index 426c56b9bd..334077efb5 100644
--- a/libavformat/cafdec.c
+++ b/libavformat/cafdec.c
@@ -33,6 +33,7 @@
 #include "isom.h"
 #include "mov_chan.h"
 #include "libavcodec/flac.h"
+#include "libavcodec/internal.h"
 #include "libavutil/intreadwrite.h"
 #include "libavutil/intfloat.h"
 #include "libavutil/dict.h"
@@ -87,6 +88,10 @@ static int read_desc_chunk(AVFormatContext *s)
     st->codecpar->ch_layout.nb_channels = avio_rb32(pb);
     st->codecpar->bits_per_coded_sample = avio_rb32(pb);
 
+    if (st->codecpar->ch_layout.nb_channels > FF_SANE_NB_CHANNELS ||
+        st->codecpar->bits_per_coded_sample > 64)
+        return AVERROR_INVALIDDATA;
+
     if (caf->bytes_per_packet < 0 || caf->frames_per_packet < 0 || st->codecpar->ch_layout.nb_channels < 0)
         return AVERROR_INVALIDDATA;
 
-- 
2.17.1