[FFmpeg-cvslog] avcodec/siren: Fix integer overflow in get_dw()

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Wed Mar 18 20:20:43 2020 +0100| [3197b0099bb275bbaeb459c0ea103854eac10987] | committer: Michael Niedermayer

avcodec/siren: Fix integer overflow in get_dw()

Fixes: signed integer overflow: 685813396 + 1803454769 cannot be represented in type 'int'
Fixes: 21073/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SIREN_fuzzer-5744900508483584

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Paul B Mahol <onemda at gmail.com>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=3197b0099bb275bbaeb459c0ea103854eac10987
---

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

diff --git a/libavcodec/siren.c b/libavcodec/siren.c
index 76dfe62843..1c17d4505d 100644
--- a/libavcodec/siren.c
+++ b/libavcodec/siren.c
@@ -363,7 +363,7 @@ typedef struct SirenContext {
     int sample_rate_bits;
     int region_size;
 
-    int dw1, dw2, dw3, dw4;
+    unsigned dw1, dw2, dw3, dw4;
 
     int absolute_region_power_index[32];
     float decoder_standard_deviation[32];