[FFmpeg-cvslog] avcodec/wavarc: Fix integer overflwo in do_stereo()

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Thu Sep 21 00:13:27 2023 +0200| [f3c986200d7f4ec934c480b09aa8a13554da032d] | committer: Michael Niedermayer

avcodec/wavarc: Fix integer overflwo in do_stereo()

Fixes: signed integer overflow: 148676193 - -2006512262 cannot be represented in type 'int'
Fixes: 62164/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_WAVARC_fuzzer-5963163952349184

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=f3c986200d7f4ec934c480b09aa8a13554da032d
---

 libavcodec/wavarc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libavcodec/wavarc.c b/libavcodec/wavarc.c
index 2e32b46ebd..6941ba9ab5 100644
--- a/libavcodec/wavarc.c
+++ b/libavcodec/wavarc.c
@@ -154,11 +154,11 @@ static void do_stereo(WavArcContext *s, int ch, int correlated, int len)
     } else {
         if (correlated) {
             for (int n = 0; n < nb_samples; n++)
-                s->samples[1][n + len] += s->samples[0][n + len];
+                s->samples[1][n + len] += (unsigned)s->samples[0][n + len];
         }
         for (int n = 0; n < len; n++) {
             s->pred[0][n] = s->samples[1][nb_samples + n];
-            s->pred[1][n] = s->pred[0][n] - s->samples[0][nb_samples + n];
+            s->pred[1][n] = s->pred[0][n] - (unsigned)s->samples[0][nb_samples + n];
         }
     }
 }