[FFmpeg-cvslog] avcodec/diracdec: Fixes integer overflow

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Tue Aug 15 03:32:44 2017 +0200| [92da23093c784b1d9f0db4db51d28ea80a59e759] | committer: Michael Niedermayer

avcodec/diracdec: Fixes integer overflow

Fixes: runtime error: signed integer overflow: 340018243 * 27 cannot be represented in type 'int'
Fixes: 2861/clusterfuzz-testcase-minimized-5361070510178304

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=92da23093c784b1d9f0db4db51d28ea80a59e759
---

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

diff --git a/libavcodec/diracdec.c b/libavcodec/diracdec.c
index 29042bd86b..0aee08f9e1 100644
--- a/libavcodec/diracdec.c
+++ b/libavcodec/diracdec.c
@@ -442,7 +442,7 @@ static av_cold int dirac_decode_end(AVCodecContext *avctx)
 static inline int coeff_unpack_golomb(GetBitContext *gb, int qfactor, int qoffset)
 {
     int coeff = dirac_get_se_golomb(gb);
-    const int sign = FFSIGN(coeff);
+    const unsigned sign = FFSIGN(coeff);
     if (coeff)
         coeff = sign*((sign * coeff * qfactor + qoffset) >> 2);
     return coeff;