[FFmpeg-cvslog] avcodec/escape124: Do not return random numbers

[Michael Niedermayer]

ffmpeg | branch: release/4.2 | Michael Niedermayer <michael at niedermayer.cc> | Sun Sep 17 00:21:52 2023 +0200| [4b257fba5076d7c5e86665092c9aa92d3ef6df19] | committer: Michael Niedermayer

avcodec/escape124: Do not return random numbers

Fixes: out of array access
Fixes: 62164/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ESCAPE124_fuzzer-6035022714634240
Fixes: 62164/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ESCAPE124_fuzzer-6422176201572352

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit fe6d46490f5ea9155fe0601b6246960ae17317fc)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=4b257fba5076d7c5e86665092c9aa92d3ef6df19
---

 libavcodec/escape124.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libavcodec/escape124.c b/libavcodec/escape124.c
index 5e4e57bf90..6bcad51edc 100644
--- a/libavcodec/escape124.c
+++ b/libavcodec/escape124.c
@@ -238,7 +238,7 @@ static int escape124_decode_frame(AVCodecContext *avctx,
         if ((ret = av_frame_ref(frame, s->frame)) < 0)
             return ret;
 
-        return frame_size;
+        return 0;
     }
 
     for (i = 0; i < 3; i++) {
@@ -372,7 +372,7 @@ static int escape124_decode_frame(AVCodecContext *avctx,
 
     *got_frame = 1;
 
-    return frame_size;
+    return 0;
 }