Re: [dpdk-dev] [PATCH v3 1/2] eal: fix memory leak when removing event_cb

[Jeff Guo <jia.guo@intel.com>]

hi, yunjian

On 7/2/2020 7:47 PM, wangyunjian wrote:
> From: Yunjian Wang <wangyunjian@huawei.com>
>
> The event_cb->dev_name is not freed when freeing event_cb,
> and this causes a memory leak.
>
> Fixes: a753e53d517b ("eal: add device event monitor framework")
> Cc: stable@dpdk.org
>
> Signed-off-by: Yunjian Wang <wangyunjian@huawei.com>
> ---
>   lib/librte_eal/common/eal_common_dev.c | 2 ++
>   1 file changed, 2 insertions(+)
>
> diff --git a/lib/librte_eal/common/eal_common_dev.c b/lib/librte_eal/common/eal_common_dev.c
> index 9e4f09d..4cfdb80 100644
> --- a/lib/librte_eal/common/eal_common_dev.c
> +++ b/lib/librte_eal/common/eal_common_dev.c
> @@ -526,6 +526,8 @@ static int cmp_dev_name(const struct rte_device *dev, const void *_name)
>   		 */
>   		if (event_cb->active == 0) {
>   			TAILQ_REMOVE(&dev_event_cbs, event_cb, next);
> +			if (event_cb->dev_name)
> +				free(event_cb->dev_name);
>   			free(event_cb);
>   			ret++;
>   		} else {


After you check, don't you think the memory leak would not occur in 
rte_dev_event_callback_register when free event_cb? And if you have find 
other same problem, suggest to fix it wholly by this good chance. Thanks.

int
rte_dev_event_callback_register(const char *device_name,
                 rte_dev_event_cb_fn cb_fn,
                 void *cb_arg)
{

error:
     free(event_cb);
     rte_spinlock_unlock(&dev_event_lock);
     return ret;

}