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lavfi/showinfo: check plane count before dereferencing.
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@ -50,7 +50,7 @@ static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *frame)
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uint32_t plane_checksum[4] = {0}, checksum = 0;
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int i, plane, vsub = desc->log2_chroma_h;
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for (plane = 0; frame->data[plane] && plane < 4; plane++) {
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for (plane = 0; plane < 4 && frame->data[plane]; plane++) {
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int64_t linesize = av_image_get_linesize(frame->format, frame->video->w, plane);
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uint8_t *data = frame->data[plane];
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int h = plane == 1 || plane == 2 ? inlink->h >> vsub : inlink->h;
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@ -80,7 +80,7 @@ static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *frame)
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av_get_picture_type_char(frame->video->pict_type),
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checksum, plane_checksum[0]);
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for (plane = 1; frame->data[plane] && plane < 4; plane++)
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for (plane = 1; plane < 4 && frame->data[plane]; plane++)
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av_log(ctx, AV_LOG_INFO, " %08X", plane_checksum[plane]);
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av_log(ctx, AV_LOG_INFO, "]\n");
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