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avcodec/dvdsubenc: return error if canvas_size is too small for subtitle render
Signed-off-by: Limin Wang <lance.lmwang@gmail.com>
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@ -376,6 +376,12 @@ static int encode_dvd_subtitles(AVCodecContext *avctx,
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x2 = vrect.x + vrect.w - 1;
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y2 = vrect.y + vrect.h - 1;
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if (x2 > avctx->width || y2 > avctx->height) {
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av_log(avctx, AV_LOG_ERROR, "canvas_size(%d:%d) is too small(%d:%d) for render\n",
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avctx->width, avctx->height, x2, y2);
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ret = AVERROR(EINVAL);;
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goto fail;
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}
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*q++ = 0x05;
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// x1 x2 -> 6 nibbles
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*q++ = vrect.x >> 4;
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