On Apr 01 2017 or thereabouts, Dmitry Torokhov wrote:
> When trying to destroy platform data after destruction of SMbus companion,
> we need to make sure that we are actually dealing with an SMB companion
> device, and not some random I2C client device.
>
> Fixes: 8eb92e5c9133 ("Input: psmouse - add support for SMBus companions")
> Reported-by: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxxx>
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
> ---
Thanks for the fix!
Tested-by: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxxx>
Cheers,
Benjamin
> drivers/input/mouse/psmouse-smbus.c | 30 +++++++++++++++++++-----------
> 1 file changed, 19 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/input/mouse/psmouse-smbus.c b/drivers/input/mouse/psmouse-smbus.c
> index d0cf2fde173e..c7ac24d119c1 100644
> --- a/drivers/input/mouse/psmouse-smbus.c
> +++ b/drivers/input/mouse/psmouse-smbus.c
> @@ -61,24 +61,29 @@ static void psmouse_smbus_check_adapter(struct i2c_adapter *adapter)
>
> static void psmouse_smbus_detach_i2c_client(struct i2c_client *client)
> {
> - struct psmouse_smbus_dev *smbdev;
> + struct psmouse_smbus_dev *smbdev, *tmp;
>
> mutex_lock(&psmouse_smbus_mutex);
>
> - list_for_each_entry(smbdev, &psmouse_smbus_list, node) {
> - if (smbdev->client == client) {
> + list_for_each_entry_safe(smbdev, tmp, &psmouse_smbus_list, node) {
> + if (smbdev->client != client)
> + continue;
> +
> + kfree(client->dev.platform_data);
> + client->dev.platform_data = NULL;
> +
> + if (!smbdev->dead) {
> psmouse_dbg(smbdev->psmouse,
> "Marking SMBus companion %s as gone\n",
> dev_name(&smbdev->client->dev));
> - smbdev->client = NULL;
> smbdev->dead = true;
> serio_rescan(smbdev->psmouse->ps2dev.serio);
> + } else {
> + list_del(&smbdev->node);
> + kfree(smbdev);
> }
> }
>
> - kfree(client->dev.platform_data);
> - client->dev.platform_data = NULL;
> -
> mutex_unlock(&psmouse_smbus_mutex);
> }
>
> @@ -162,17 +167,20 @@ static void psmouse_smbus_disconnect(struct psmouse *psmouse)
> struct psmouse_smbus_dev *smbdev = psmouse->private;
>
> mutex_lock(&psmouse_smbus_mutex);
> - list_del(&smbdev->node);
> - mutex_unlock(&psmouse_smbus_mutex);
>
> - if (smbdev->client) {
> + if (smbdev->dead) {
> + list_del(&smbdev->node);
> + kfree(smbdev);
> + } else {
> + smbdev->dead = true;
> psmouse_dbg(smbdev->psmouse,
> "posting removal request for SMBus companion %s\n",
> dev_name(&smbdev->client->dev));
> psmouse_smbus_schedule_remove(smbdev->client);
> }
>
> - kfree(smbdev);
> + mutex_unlock(&psmouse_smbus_mutex);
> +
> psmouse->private = NULL;
> }
>
> --
> 2.12.2.564.g063fe858b8-goog
>
>
> --
> Dmitry
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