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libjson: make sure string contains only a single JSON value

--- a/sys/src/libjson/json.c

+++ b/sys/src/libjson/json.c

@@ -328,6 +328,13 @@

 	j = jsonobj(&l);

 	free(l.buf);

+

+	if(peeknonspace(&l) != 0){

+		jsonfree(j);

+		werrstr("json: unexpected trailing data");

+		return nil;

+	}

+

 	return j;

 }