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avcodec/apedec: Fix integer overflow in predictor_decode_stereo_3950()

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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@niedermayer.cc>
(cherry picked from commit 2def61778777e998e2ac538f56b8e6779b0ca8c1)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2023-10-20 18:20:14 +02:00
parent cebc2b3880
commit c9a9dbfebf
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1 changed files with 1 additions and 1 deletions
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libavcodec/apedec.c
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@ -1284,7 +1284,7 @@ static void predictor_decode_stereo_3950(APEContext *ctx, int count)
*decoded1++ = a1; *decoded1++ = a1;
if (num_passes > 1) { if (num_passes > 1) {
int32_t left = a1 - (unsigned)(a0 / 2); 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)) { if (FFMAX(FFABS(left), FFABS(right)) > (1<<23)) {
ctx->interim_mode = !interim_mode; ctx->interim_mode = !interim_mode;