[FFmpeg-cvslog] avcodec/apedec: Fix integer overflow in predictor_decode_stereo_3950()
Michael Niedermayer
git at videolan.org
Wed Nov 1 17:48:55 EET 2023
ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Fri Oct 20 18:20:14 2023 +0200| [2def61778777e998e2ac538f56b8e6779b0ca8c1] | committer: Michael Niedermayer
avcodec/apedec: Fix integer overflow in predictor_decode_stereo_3950()
Fixes: signed integer overflow: 1900031961 + 553590817 cannot be represented in type 'int'
Fixes: 63061/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_APE_fuzzer-5166188298371072
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=2def61778777e998e2ac538f56b8e6779b0ca8c1
---
libavcodec/apedec.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavcodec/apedec.c b/libavcodec/apedec.c
index 8bfbb75b41..d31c067152 100644
--- a/libavcodec/apedec.c
+++ b/libavcodec/apedec.c
@@ -1284,7 +1284,7 @@ static void predictor_decode_stereo_3950(APEContext *ctx, int count)
*decoded1++ = a1;
if (num_passes > 1) {
int32_t left = a1 - (unsigned)(a0 / 2);
- int32_t right = left + a0;
+ int32_t right = left + (unsigned)a0;
if (FFMAX(FFABS(left), FFABS(right)) > (1<<23)) {
ctx->interim_mode = !interim_mode;
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