From: Johan Hovold Date: Mon, 11 May 2026 14:37:13 +0000 (+0200) Subject: i2c: core: fix adapter deregistration race X-Git-Url: http://git.ipfire.org/gitweb/?a=commitdiff_plain;h=b1a58ed9eab146b36f41a55db8f5d7ce9fdedf3f;p=thirdparty%2Flinux.git i2c: core: fix adapter deregistration race Adapters can be looked up by their id using i2c_get_adapter() which takes a reference to the embedded struct device. Remove the adapter from the IDR before tearing it down during deregistration (and on registration failure) to make sure its resources are not accessed after having been freed (e.g. the device name). Fixes: 35fc37f81881 ("i2c: Limit core locking to the necessary sections") Cc: stable@vger.kernel.org # 2.6.31 Cc: Jean Delvare Signed-off-by: Johan Hovold Signed-off-by: Wolfram Sang --- diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c index 01a984d3ca0e2..38f425aecef86 100644 --- a/drivers/i2c/i2c-core-base.c +++ b/drivers/i2c/i2c-core-base.c @@ -1587,7 +1587,7 @@ static int i2c_register_adapter(struct i2c_adapter *adap) res = device_add(&adap->dev); if (res) { pr_err("adapter '%s': can't register device (%d)\n", adap->name, res); - goto err_remove_debugfs; + goto err_replace_id; } res = i2c_setup_smbus_alert(adap); @@ -1614,7 +1614,10 @@ static int i2c_register_adapter(struct i2c_adapter *adap) out_reg: i2c_deregister_clients(adap); device_del(&adap->dev); -err_remove_debugfs: +err_replace_id: + mutex_lock(&core_lock); + idr_replace(&i2c_adapter_idr, NULL, adap->nr); + mutex_unlock(&core_lock); debugfs_remove_recursive(adap->debugfs); pm_runtime_disable(&adap->dev); err_put_adap: @@ -1804,6 +1807,8 @@ void i2c_del_adapter(struct i2c_adapter *adap) /* First make sure that this adapter was ever added */ mutex_lock(&core_lock); found = idr_find(&i2c_adapter_idr, adap->nr); + if (found == adap) + idr_replace(&i2c_adapter_idr, NULL, adap->nr); mutex_unlock(&core_lock); if (found != adap) { pr_debug("attempting to delete unregistered adapter [%s]\n", adap->name);