[FFmpeg-cvslog] avcodec/ralf: Fix integer overflow in apply_lpc()
Michael Niedermayer
git at videolan.org
Mon Aug 5 20:50:35 EEST 2019
ffmpeg | branch: release/4.2 | Michael Niedermayer <michael at niedermayer.cc> | Sun Aug 4 17:20:45 2019 +0200| [414144a371bfa7606a258af37ef14370e2fe5eee] | committer: Michael Niedermayer
avcodec/ralf: Fix integer overflow in apply_lpc()
Fixes: signed integer overflow: 1603085316 + 1238786562 cannot be represented in type 'int'
Fixes: 16203/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_RALF_fuzzer-5086088934195200
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 ccca484324e04dff4cb81d0f9018ae828e6b5c89)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=414144a371bfa7606a258af37ef14370e2fe5eee
---
libavcodec/ralf.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavcodec/ralf.c b/libavcodec/ralf.c
index 3f7953c6db..0d6b57d652 100644
--- a/libavcodec/ralf.c
+++ b/libavcodec/ralf.c
@@ -323,7 +323,7 @@ static void apply_lpc(RALFContext *ctx, int ch, int length, int bits)
acc = 0;
for (j = 0; j < flen; j++)
- acc += ctx->filter[j] * audio[i - j - 1];
+ acc += (unsigned)ctx->filter[j] * audio[i - j - 1];
if (acc < 0) {
acc = (acc + bias - 1) >> ctx->filter_bits;
acc = FFMAX(acc, min_clip);
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