diff --git a/drivers/media/dvb-frontends/dib7000p.c b/drivers/media/dvb-frontends/dib7000p.c
index 55bee50aa8716e2dccbe5225ca4efde45eefce0a..86bff5ce000b100bb52b74bd619e2a6bfe7a26df 100644
--- a/drivers/media/dvb-frontends/dib7000p.c
+++ b/drivers/media/dvb-frontends/dib7000p.c
@@ -2198,6 +2198,8 @@ static int w7090p_tuner_write_serpar(struct i2c_adapter *i2c_adap, struct i2c_ms
 	struct dib7000p_state *state = i2c_get_adapdata(i2c_adap);
 	u8 n_overflow = 1;
 	u16 i = 1000;
+	if (msg[0].len < 3)
+		return -EOPNOTSUPP;
 	u16 serpar_num = msg[0].buf[0];
 
 	while (n_overflow == 1 && i) {
@@ -2217,6 +2219,8 @@ static int w7090p_tuner_read_serpar(struct i2c_adapter *i2c_adap, struct i2c_msg
 	struct dib7000p_state *state = i2c_get_adapdata(i2c_adap);
 	u8 n_overflow = 1, n_empty = 1;
 	u16 i = 1000;
+	if (msg[0].len < 1 || msg[1].len < 2)
+		return -EOPNOTSUPP;
 	u16 serpar_num = msg[0].buf[0];
 	u16 read_word;