[FFmpeg-cvslog] avcodec/apedec: Fixes integer overflow of res+*data in do_apply_filter()
Michael Niedermayer
git at videolan.org
Fri Nov 22 01:04:09 EET 2019
ffmpeg | branch: release/4.0 | Michael Niedermayer <michael at niedermayer.cc> | Tue Oct 29 18:30:07 2019 +0100| [6b430f066b9d6637f145fe228e7950a03820a1ab] | committer: Michael Niedermayer
avcodec/apedec: Fixes integer overflow of res+*data in do_apply_filter()
Fixes: signed integer overflow: 7400 + 2147482786 cannot be represented in type 'int'
Fixes: 18405/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_APE_fuzzer-5708834760294400
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit dc3f327e7403a34c88a900f0b8de55b4afd7cf6c)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=6b430f066b9d6637f145fe228e7950a03820a1ab
---
libavcodec/apedec.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavcodec/apedec.c b/libavcodec/apedec.c
index 0c0c22b18a..7d07f5f8f1 100644
--- a/libavcodec/apedec.c
+++ b/libavcodec/apedec.c
@@ -1268,7 +1268,7 @@ static void do_apply_filter(APEContext *ctx, int version, APEFilter *f,
f->adaptcoeffs - order,
order, APESIGN(*data));
res = (int)(res + (1U << (fracbits - 1))) >> fracbits;
- res += *data;
+ res += (unsigned)*data;
*data++ = res;
/* Update the output history */
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