[FFmpeg-cvslog] avcodec/apedec: Fix an integer overflow in predictor_update_filter()
Michael Niedermayer
git at videolan.org
Mon Oct 30 02:11:12 EET 2023
ffmpeg | branch: release/5.1 | Michael Niedermayer <michael at niedermayer.cc> | Sat Sep 16 23:36:29 2023 +0200| [95b2569427d8974b570afe209c3de9215ba9c985] | committer: Michael Niedermayer
avcodec/apedec: Fix an integer overflow in predictor_update_filter()
Fixes: signed integer overflow: -2147483506 + -801380 cannot be represented in type 'int'
Fixes: 62164/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_APE_fuzzer-6578985923117056
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 515c0247a3062ca4639e457c81d2f58c504e9e8f)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=95b2569427d8974b570afe209c3de9215ba9c985
---
libavcodec/apedec.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavcodec/apedec.c b/libavcodec/apedec.c
index 8aca605343..8488f97a77 100644
--- a/libavcodec/apedec.c
+++ b/libavcodec/apedec.c
@@ -1202,7 +1202,7 @@ static av_always_inline int predictor_update_filter(APEPredictor64 *p,
if (compression_level < COMPRESSION_LEVEL_INSANE) {
predictionA = (int32_t)predictionA;
predictionB = (int32_t)predictionB;
- p->lastA[filter] = decoded + ((int32_t)(predictionA + (predictionB >> 1)) >> 10);
+ p->lastA[filter] = (int32_t)(decoded + (unsigned)((int32_t)(predictionA + (predictionB >> 1)) >> 10));
} else {
p->lastA[filter] = decoded + ((int64_t)((uint64_t)predictionA + (predictionB >> 1)) >> 10);
}
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