Would it be rude to ask my friend to bring food to our Christmas dinner?

I did something stupid. I live with my mom. We are having a Christmas dinner tomorrow. My sister and brother in law are coming. I was having a conversation with my friend the other day. We both are awkward people. I was running out of things to say. He said he wasn't doing anything for Christmas, so without asking, I invited him to our Christmas dinner without even asking my mom. I told my mom. She said that he can come, but he'll have to bring food because we dont have enough. She told me to ask him to bring a steak or something. Id kind of rather just tell him the truth and say that I invited you without asking my mom, and there isn't enough food.

Would it be rude to ask my friend to bring food to our Christmas dinner?
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