netdev - Re: [drivers/net/netdevsim] Question about possible memleak

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Date: Thu, 14 Mar 2024 11:55:32 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Zijie Zhao <zzjas98@...il.com>
Cc: davem@...emloft.net, edumazet@...gle.com, pabeni@...hat.com,
 netdev@...r.kernel.org, chenyuan0y@...il.com
Subject: Re: [drivers/net/netdevsim] Question about possible memleak

On Wed, 13 Mar 2024 21:13:18 -0500 Zijie Zhao wrote:
> Here if the `err_nsim_bus_dev_id_free` label is entered,
> `nsim_bus_dev` will be assigned `NULL` and then `kfree(nsim_bus_dev)`
> will not free the allocated memory.
> 
> Please kindly correct us if we missed any key information. Looking
> forward to your response!

/**
 * device_register - register a device with the system.
 * @dev: pointer to the device structure
 *
 * This happens in two clean steps - initialize the device
 * and add it to the system. The two steps can be called
 * separately, but this is the easiest and most common.
 * I.e. you should only call the two helpers separately if
 * have a clearly defined need to use and refcount the device
 * before it is added to the hierarchy.
 *
 * For more information, see the kerneldoc for device_initialize()
 * and device_add().
 *
 * NOTE: _Never_ directly free @dev after calling this function, even
 * if it returned an error! Always use put_device() to give up the
 * reference initialized in this function instead.
 */
int device_register(struct device *dev)