Input: adp5589-keys - fix NULL pointer dereference

We register a devm action to call adp5589_clear_config() and then pass
the i2c client as argument so that we can call i2c_get_clientdata() in
order to get our device object. However, i2c_set_clientdata() is only
being set at the end of the probe function which means that we'll get a
NULL pointer dereference in case the probe function fails early.

Fixes: 30df385e35a4 ("Input: adp5589-keys - use devm_add_action_or_reset() for register clear")
Signed-off-by: Nuno Sa <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20241001-b4-dev-adp5589-fw-conversion-v1-1-fca0149dfc47@analog.com
Cc: stable@vger.kernel.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

diff --git a/drivers/input/keyboard/adp5589-keys.c b/drivers/input/keyboard/adp5589-keys.c
index 8996e00cd63a8203ec53d46ccb922c21ddb47355..68a29d67be57fc22088a912694e3e6e16e46d956 100644 (file)
--- a/drivers/input/keyboard/adp5589-keys.c
+++ b/drivers/input/keyboard/adp5589-keys.c
@@ -936,10 +936,9 @@ static int adp5589_keypad_add(struct adp5589_kpad *kpad, unsigned int revid)
 
 static void adp5589_clear_config(void *data)
 {
-       struct i2c_client *client = data;
-       struct adp5589_kpad *kpad = i2c_get_clientdata(client);
+       struct adp5589_kpad *kpad = data;
 
-       adp5589_write(client, kpad->var->reg(ADP5589_GENERAL_CFG), 0);
+       adp5589_write(kpad->client, kpad->var->reg(ADP5589_GENERAL_CFG), 0);
 }
 
 static int adp5589_probe(struct i2c_client *client)
@@ -983,7 +982,7 @@ static int adp5589_probe(struct i2c_client *client)
        }
 
        error = devm_add_action_or_reset(&client->dev, adp5589_clear_config,
-                                        client);
+                                        kpad);
        if (error)
                return error;
 
@@ -1010,8 +1009,6 @@ static int adp5589_probe(struct i2c_client *client)
        if (error)
                return error;
 
-       i2c_set_clientdata(client, kpad);
-
        dev_info(&client->dev, "Rev.%d keypad, irq %d\n", revid, client->irq);
        return 0;
 }