From faedf9f8ef5b657064ecf6af8d1ba767ada60bf4 Mon Sep 17 00:00:00 2001 From: happyworker <208suo@208suo.com> Date: Tue, 25 Jun 2024 10:58:39 +0800 Subject: [PATCH] fix-CVE-2023-51798 --- libavfilter/vf_minterpolate.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/libavfilter/vf_minterpolate.c b/libavfilter/vf_minterpolate.c index b0bb238..745987c 100644 --- a/libavfilter/vf_minterpolate.c +++ b/libavfilter/vf_minterpolate.c @@ -1086,9 +1086,13 @@ static void interpolate(AVFilterLink *inlink, AVFrame *avf_out) pts = av_rescale(avf_out->pts, (int64_t) ALPHA_MAX * outlink->time_base.num * inlink->time_base.den, (int64_t) outlink->time_base.den * inlink->time_base.num); - alpha = (pts - mi_ctx->frames[1].avf->pts * ALPHA_MAX) / (mi_ctx->frames[2].avf->pts - mi_ctx->frames[1].avf->pts); - alpha = av_clip(alpha, 0, ALPHA_MAX); - + if (mi_ctx->frames[2].avf->pts > mi_ctx->frames[1].avf->pts) { + alpha = (pts - mi_ctx->frames[1].avf->pts * ALPHA_MAX) / (mi_ctx->frames[2].avf->pts - mi_ctx->frames[1].avf->pts); + alpha = av_clip(alpha, 0, ALPHA_MAX); + } else { + av_log(ctx, AV_LOG_DEBUG, "duplicate input PTS detected\n"); + alpha = 0; + } if (alpha == 0 || alpha == ALPHA_MAX) { av_frame_copy(avf_out, alpha ? mi_ctx->frames[2].avf : mi_ctx->frames[1].avf); return; -- 2.43.0