[FFmpeg-cvslog] avcodec/ac3dec: Check that the number of channels with dependant streams is valid
Michael Niedermayer
git at videolan.org
Mon May 28 00:19:49 EEST 2018
ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Fri May 25 22:55:19 2018 +0200| [e3275f937dc38e740c74539f2f6aad5bfdba2bf1] | committer: Michael Niedermayer
avcodec/ac3dec: Check that the number of channels with dependant streams is valid
Fixes: left shift of 1 by 63 places cannot be represented in type 'long long'
Fixes: out of array access
Fixes: 7284/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_AC3_fuzzer-5767914968842240
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=e3275f937dc38e740c74539f2f6aad5bfdba2bf1
---
libavcodec/ac3dec.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/libavcodec/ac3dec.c b/libavcodec/ac3dec.c
index 317b2bd800..dfa025cbcc 100644
--- a/libavcodec/ac3dec.c
+++ b/libavcodec/ac3dec.c
@@ -1702,6 +1702,11 @@ dependent_frame:
channel_layout |= custom_channel_map_locations[ch][1];
}
}
+ if (av_get_channel_layout_nb_channels(channel_layout) > EAC3_MAX_CHANNELS) {
+ av_log(avctx, AV_LOG_ERROR, "Too many channels (%d) coded\n",
+ av_get_channel_layout_nb_channels(channel_layout));
+ return AVERROR_INVALIDDATA;
+ }
avctx->channel_layout = channel_layout;
avctx->channels = av_get_channel_layout_nb_channels(channel_layout);
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