[FFmpeg-cvslog] avcodec/truespeech: Fix integer overflow in truespeech_synth()

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Mon Oct  7 18:13:26 2019 +0200| [66589d9bd9903c6be089f0bf89799314c3eb7b6a] | committer: Michael Niedermayer

avcodec/truespeech: Fix integer overflow in truespeech_synth()

Fixes: signed integer overflow: -1801695444 + -830224908 cannot be represented in type 'int'
Fixes: 17995/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_TRUESPEECH_fuzzer-5648084880588800

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=66589d9bd9903c6be089f0bf89799314c3eb7b6a
---

 libavcodec/truespeech.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/truespeech.c b/libavcodec/truespeech.c
index 799cef0945..d7c2d535e2 100644
--- a/libavcodec/truespeech.c
+++ b/libavcodec/truespeech.c
@@ -254,7 +254,7 @@ static void truespeech_synth(TSContext *dec, int16_t *out, int quart)
     for(i = 0; i < 60; i++){
         int sum = 0;
         for(k = 0; k < 8; k++)
-            sum += ptr0[k] * ptr1[k];
+            sum += ptr0[k] * (unsigned)ptr1[k];
         sum = out[i] + ((sum + 0x800) >> 12);
         out[i] = av_clip(sum, -0x7FFE, 0x7FFE);
         for(k = 7; k > 0; k--)