[PATCH v2] crypto: atmel-sha204a - Fix potential UAF and memory leak in remove path

[Herbert Xu]

On Sat, Mar 14, 2026 at 08:36:29PM +0100, Thorsten Blum wrote:
>
> diff --git a/drivers/crypto/atmel-sha204a.c b/drivers/crypto/atmel-sha204a.c
> index 98d1023007e3..aeadbc9a2759 100644
> --- a/drivers/crypto/atmel-sha204a.c
> +++ b/drivers/crypto/atmel-sha204a.c
> @@ -191,10 +191,8 @@ static void atmel_sha204a_remove(struct i2c_client *client)
>  {
>  	struct atmel_i2c_client_priv *i2c_priv = i2c_get_clientdata(client);
>  
> -	if (atomic_read(&i2c_priv->tfm_count)) {
> -		dev_emerg(&client->dev, "Device is busy, will remove it anyhow\n");
> -		return;
> -	}
> +	devm_hwrng_unregister(&client->dev, &i2c_priv->hwrng);

Is it OK to explicitly call devm_hwrng_unregister?

Perhaps it's best to remove the devm management?

Thanks,
-- 
Email: Herbert Xu <herbert at gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt