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[FFmpeg-devel,2/5] avcodec/apedec: Fix an integer overflow in predictor_update_filter()

Message ID 20230918223534.23567-2-michael@niedermayer.cc
State New
Headers show
Series [FFmpeg-devel,1/5] tools/target_dec_fuzzer: Adjust wmapro threshold | expand

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Context Check Description
andriy/make_x86 success Make finished
andriy/make_fate_x86 success Make fate finished

Commit Message

Michael Niedermayer Sept. 18, 2023, 10:35 p.m. UTC 
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@niedermayer.cc>
---
 libavcodec/apedec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/libavcodec/apedec.c b/libavcodec/apedec.c
index 62cb397490d..8bfbb75b41e 100644
--- a/libavcodec/apedec.c
+++ b/libavcodec/apedec.c
@@ -1220,7 +1220,7 @@  static av_always_inline int predictor_update_filter(APEPredictor64 *p,
     if (interim_mode < 1) {
         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);
     }