From 2f822f1da08ac5c93e351e79d22920f08fa51baf Mon Sep 17 00:00:00 2001 From: Wolfram Sang Date: Fri, 9 Aug 2019 13:52:15 -0300 Subject: [PATCH] media: i2c: tda1997x: prevent potential NULL pointer access i2c_new_dummy() can fail returning a NULL pointer. This is not checked and the returned pointer is blindly used. Convert to devm_i2c_new_dummy_client() which returns an ERR_PTR and also add a validity check. Using devm_* here also fixes a leak because the dummy client was not released in the probe error path. Signed-off-by: Wolfram Sang Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab --- drivers/media/i2c/tda1997x.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/drivers/media/i2c/tda1997x.c b/drivers/media/i2c/tda1997x.c index a62ede096636..5e68182001ec 100644 --- a/drivers/media/i2c/tda1997x.c +++ b/drivers/media/i2c/tda1997x.c @@ -2691,7 +2691,13 @@ static int tda1997x_probe(struct i2c_client *client, } ret = 0x34 + ((io_read(sd, REG_SLAVE_ADDR)>>4) & 0x03); - state->client_cec = i2c_new_dummy(client->adapter, ret); + state->client_cec = devm_i2c_new_dummy_device(&client->dev, + client->adapter, ret); + if (IS_ERR(state->client_cec)) { + ret = PTR_ERR(state->client_cec); + goto err_free_mutex; + } + v4l_info(client, "CEC slave address 0x%02x\n", ret); ret = tda1997x_core_init(sd); @@ -2798,7 +2804,6 @@ static int tda1997x_remove(struct i2c_client *client) media_entity_cleanup(&sd->entity); v4l2_ctrl_handler_free(&state->hdl); regulator_bulk_disable(TDA1997X_NUM_SUPPLIES, state->supplies); - i2c_unregister_device(state->client_cec); cancel_delayed_work(&state->delayed_work_enable_hpd); mutex_destroy(&state->page_lock); mutex_destroy(&state->lock);