forked from jengelh/ffmpeg-4
Jan Engelhardt
6e1ca12e6b
0001-avfilter-vf_minterpolate-Check-pts-before-division.patch OBS-URL: https://build.opensuse.org/package/show/multimedia:libs/ffmpeg-4?expand=0&rev=211
41 lines
1.6 KiB
Diff
41 lines
1.6 KiB
Diff
From 68146f06f852078866b3ef1564556e3a272920c7 Mon Sep 17 00:00:00 2001
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From: Michael Niedermayer <michael@niedermayer.cc>
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Date: Sat, 30 Dec 2023 02:51:32 +0100
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Subject: [PATCH] avfilter/vf_minterpolate: Check pts before division
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References: https://bugzilla.opensuse.org/1223304
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References: CVE-2023-51798
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Fixes: FPE
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Fixes: tickets/10758/poc20ffmpeg
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Discovered by Zeng Yunxiang
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Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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---
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libavfilter/vf_minterpolate.c | 9 +++++++--
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1 file changed, 7 insertions(+), 2 deletions(-)
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diff --git a/libavfilter/vf_minterpolate.c b/libavfilter/vf_minterpolate.c
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index 9920210ece..b2242a15ee 100644
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--- a/libavfilter/vf_minterpolate.c
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+++ b/libavfilter/vf_minterpolate.c
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@@ -1075,8 +1075,13 @@ static void interpolate(AVFilterLink *inlink, AVFrame *avf_out)
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pts = av_rescale(avf_out->pts, (int64_t) ALPHA_MAX * outlink->time_base.num * inlink->time_base.den,
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(int64_t) outlink->time_base.den * inlink->time_base.num);
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- alpha = (pts - mi_ctx->frames[1].avf->pts * ALPHA_MAX) / (mi_ctx->frames[2].avf->pts - mi_ctx->frames[1].avf->pts);
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- alpha = av_clip(alpha, 0, ALPHA_MAX);
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+ if (mi_ctx->frames[2].avf->pts > mi_ctx->frames[1].avf->pts) {
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+ alpha = (pts - mi_ctx->frames[1].avf->pts * ALPHA_MAX) / (mi_ctx->frames[2].avf->pts - mi_ctx->frames[1].avf->pts);
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+ alpha = av_clip(alpha, 0, ALPHA_MAX);
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+ } else {
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+ av_log(ctx, AV_LOG_DEBUG, "duplicate input PTS detected\n");
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+ alpha = 0;
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+ }
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if (alpha == 0 || alpha == ALPHA_MAX) {
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av_frame_copy(avf_out, alpha ? mi_ctx->frames[2].avf : mi_ctx->frames[1].avf);
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--
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2.44.0
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