diff --git a/arch/powerpc/kernel/rtas.c b/arch/powerpc/kernel/rtas.c
index 28736ff27fea1090dc888e4ef73a6d235ce2989b..8da209fdf480e713256738de11c1c4d98c41e91b 100644
--- a/arch/powerpc/kernel/rtas.c
+++ b/arch/powerpc/kernel/rtas.c
@@ -1070,7 +1070,7 @@ asmlinkage int ppc_rtas(struct rtas_args __user *uargs)
 	nret  = be32_to_cpu(args.nret);
 	token = be32_to_cpu(args.token);
 
-	if (nargs > ARRAY_SIZE(args.args)
+	if (nargs >= ARRAY_SIZE(args.args)
 	    || nret > ARRAY_SIZE(args.args)
 	    || nargs + nret > ARRAY_SIZE(args.args))
 		return -EINVAL;