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[FFmpeg-devel,5/5] avformat/wavdec: Check block_align vs. channels before combining them

Message ID 20210117225311.17297-5-michael@niedermayer.cc
State Accepted
Commit 0af0a80cef0eae709b727896e92b44382c3feca8
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Series [FFmpeg-devel,1/5] avformat/sccdec: Use larger intermediate for ts/next_ts computation
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Commit Message

Michael Niedermayer Jan. 17, 2021, 10:53 p.m. UTC
Fixes: signed integer overflow: 65535 * 65312 cannot be represented in type 'int'
Fixes: 26910/clusterfuzz-testcase-minimized-ffmpeg_dem_WAV_fuzzer-6606935226974208

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavformat/wavdec.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
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Patch

diff --git a/libavformat/wavdec.c b/libavformat/wavdec.c
index 3da4150f05..d6ec6ca250 100644
--- a/libavformat/wavdec.c
+++ b/libavformat/wavdec.c
@@ -643,7 +643,8 @@  break_loop:
     } else if (st->codecpar->codec_id == AV_CODEC_ID_XMA1 ||
                st->codecpar->codec_id == AV_CODEC_ID_XMA2) {
         st->codecpar->block_align = 2048;
-    } else if (st->codecpar->codec_id == AV_CODEC_ID_ADPCM_MS && st->codecpar->channels > 2) {
+    } else if (st->codecpar->codec_id == AV_CODEC_ID_ADPCM_MS && st->codecpar->channels > 2 &&
+               st->codecpar->block_align < INT_MAX / st->codecpar->channels) {
         st->codecpar->block_align *= st->codecpar->channels;
     }