Fixes: left shift of negative value -4 Fixes: signed integer overflow: -15091694 * 167 cannot be represented in type 'int' Fixes: signed integer overflow: 1898547155 + 453967445 cannot be represented in type 'int' Fixes: 15258/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_APE_fuzzer-5759095564402688
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc> --- libavcodec/apedec.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) diff --git a/libavcodec/apedec.c b/libavcodec/apedec.c index 61ebfdafd5..f1bfc634c2 100644 --- a/libavcodec/apedec.c +++ b/libavcodec/apedec.c @@ -859,22 +859,22 @@ static av_always_inline int filter_3800(APEPredictor *p, return predictionA; } d2 = p->buf[delayA]; - d1 = (p->buf[delayA] - p->buf[delayA - 1]) << 1; - d0 = p->buf[delayA] + ((p->buf[delayA - 2] - p->buf[delayA - 1]) << 3); + d1 = (p->buf[delayA] - p->buf[delayA - 1]) * 2; + d0 = p->buf[delayA] + ((p->buf[delayA - 2] - p->buf[delayA - 1]) * 8); d3 = p->buf[delayB] * 2 - p->buf[delayB - 1]; d4 = p->buf[delayB]; - predictionA = d0 * p->coeffsA[filter][0] + - d1 * p->coeffsA[filter][1] + - d2 * p->coeffsA[filter][2]; + predictionA = d0 * (unsigned)p->coeffsA[filter][0] + + d1 * (unsigned)p->coeffsA[filter][1] + + d2 * (unsigned)p->coeffsA[filter][2]; sign = APESIGN(decoded); p->coeffsA[filter][0] += (((d0 >> 30) & 2) - 1) * sign; p->coeffsA[filter][1] += (((d1 >> 28) & 8) - 4) * sign; p->coeffsA[filter][2] += (((d2 >> 28) & 8) - 4) * sign; - predictionB = d3 * p->coeffsB[filter][0] - - d4 * p->coeffsB[filter][1]; + predictionB = d3 * (unsigned)p->coeffsB[filter][0] - + d4 * (unsigned)p->coeffsB[filter][1]; p->lastA[filter] = decoded + (predictionA >> 11); sign = APESIGN(p->lastA[filter]); p->coeffsB[filter][0] += (((d3 >> 29) & 4) - 2) * sign; @@ -902,7 +902,7 @@ static void long_filter_high_3800(int32_t *buffer, int order, int shift, int len dotprod = 0; sign = APESIGN(buffer[i]); for (j = 0; j < order; j++) { - dotprod += delay[j] * coeffs[j]; + dotprod += delay[j] * (unsigned)coeffs[j]; coeffs[j] += ((delay[j] >> 31) | 1) * sign; } buffer[i] -= dotprod >> shift; -- 2.21.0 _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
