avformat/y4m: do not try to seek if pts is less than 0

Fixes #8193.

avformat/y4m: do not try to seek if pts is less than 0
Fixes #8193.
05a2ce93 · Paul B Mahol · 0728d644 · 05a2ce93
Commit 05a2ce93 authored Sep 22, 2019 by Paul B Mahol
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yuv4mpegdec.c libavformat/yuv4mpegdec.c +2 -0

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--- a/libavformat/yuv4mpegdec.c
+++ b/libavformat/yuv4mpegdec.c
@@ -326,6 +326,8 @@ static int yuv4_read_seek(AVFormatContext *s, int stream_index,

    if (flags & AVSEEK_FLAG_BACKWARD)
        pts = FFMAX(0, pts - 1);
+    if (pts < 0)
+        return -1;
    pos = pts * s->packet_size;

    if (avio_seek(s->pb, pos + s->internal->data_offset, SEEK_SET) < 0)