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avformat/webpenc: Check filesize in trailer
not sure this is possible Fixes: CID1604446 Overflowed constant Sponsored-by: Sovereign Tech Fund Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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@ -190,7 +190,7 @@ static int webp_write_trailer(AVFormatContext *s)
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if (!ret) {
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if (!ret) {
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filesize = avio_tell(s->pb);
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filesize = avio_tell(s->pb);
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if (avio_seek(s->pb, 4, SEEK_SET) == 4) {
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if (filesize >= 8 && avio_seek(s->pb, 4, SEEK_SET) == 4) {
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avio_wl32(s->pb, filesize - 8);
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avio_wl32(s->pb, filesize - 8);
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// Note: without the following, avio only writes 8 bytes to the file.
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// Note: without the following, avio only writes 8 bytes to the file.
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avio_seek(s->pb, filesize, SEEK_SET);
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avio_seek(s->pb, filesize, SEEK_SET);
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