Overstay in China for 2 months

Please help!!! I am holding multi entry Visa for 2 years but i didn't realized the each stay duration is 30 days, i was overstay nearly 2 months. Very worried now, what should i do and what will happen to me? Will i get jail or deport from China? Will it affect my trip back to China next month? I am going to buy a ticket back to Malaysia end of this month.