TMZ has learned Ryan O'Neal and his son Redmond have BOTH been charged with felony possession of methamphetamines.

The 67-year-old actor and his 23-year-old son were arrested at their Malibu home last month after a random probation sweep of the mansion turned up narcotics on Redmond's person and in Ryan's bedroom.

Redmond was also charged with two misdemeanor counts of possession of drug paraphernalia and one misdemeanor count of illegal possession of pepper spray.

Redmond is on probation for a heroin and crystal meth bust earlier in the year.