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@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

diff --git a/libavcodec/siren.c b/libavcodec/siren.c
index 76dfe62843453b1551bab1ed728bea73d946a117..1c17d4505db1bf19001d34794620c598625f8452 100644 (file)
--- 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];