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avformat/matroskadec: prevent duration float-cast-overflow

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Reset matroska->duration to 0 if it is negative or if matroska->duration *
matroska->time_scale would exceed INT64_MAX, preventing a float-cast-overflow
when calculating the duration.

Signed-off-by: Marvin Scholz <epirat07@gmail.com>
(cherry picked from commit d42f8d8767)
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Marvin Scholz authored and ffmpeg-devel committed 2026-10-29 21:32:38 +00:00
1 parent ae19868753
commit 0ba284bbcb
1 file changed
+2 -1
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libavformat/matroskadec.c
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@@ -3490,7 +3490,8 @@ static int matroska_read_header(AVFormatContext *s)
if (!matroska->time_scale)
matroska->time_scale = 1000000;
if (isnan(matroska->duration))
if (isnan(matroska->duration) || matroska->duration < 0 ||
matroska->duration >= (double)INT64_MAX / matroska->time_scale)
matroska->duration = 0;
if (matroska->duration)
matroska->ctx->duration = matroska->duration * matroska->time_scale *