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[FFmpeg-devel,2/3] avcodec/ffwavesynth: Fix undefined overflow in wavesynth_synth_sample()

Message ID 20191125224717.26174-2-michael@niedermayer.cc
State New
Headers show

Commit Message

Michael Niedermayer Nov. 25, 2019, 10:47 p.m. UTC 
Fixes: signed integer overflow: 2147464192 + 21176 cannot be represented in type 'int'
Fixes: 19042/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_FFWAVESYNTH_fuzzer-5719828090585088

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavcodec/ffwavesynth.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
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Patch

diff --git a/libavcodec/ffwavesynth.c b/libavcodec/ffwavesynth.c
index 349b45534d..b9c63abb8d 100644
--- a/libavcodec/ffwavesynth.c
+++ b/libavcodec/ffwavesynth.c
@@ -350,7 +350,8 @@  fail:
 static void wavesynth_synth_sample(struct wavesynth_context *ws, int64_t ts,
                                    int32_t *channels)
 {
-    int32_t amp, val, *cv;
+    int32_t amp, *cv;
+    unsigned val;
     struct ws_interval *in;
     int i, *last, pink;
     uint32_t c, all_ch = 0;