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avcodec/apedec: Use NABS to avoid undefined negation 

Fixes: negation of -2147483648 cannot be represented in type 'int32_t' (aka 'int'); cast to an unsigned type to negate this value to itself
Fixes: 67738/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_APE_fuzzer-5444313212321792

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2024-04-01 22:11:54 +02:00
parent d58037c18e
commit 1887ff250c
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1 changed files with 1 additions and 1 deletions
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libavcodec/apedec.c
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@ -1287,7 +1287,7 @@ static void predictor_decode_stereo_3950(APEContext *ctx, int count)
int32_t left = a1 - (unsigned)(a0 / 2);
int32_t right = left + (unsigned)a0;
if (FFMAX(FFABS(left), FFABS(right)) > (1<<23)) {
if (FFMIN(FFNABS(left), FFNABS(right)) < -(1<<23)) {
ctx->interim_mode = !interim_mode;
av_log(ctx->avctx, AV_LOG_VERBOSE, "Interim mode: %d\n", ctx->interim_mode);
break;