On Wed, Sep 26, 2012 at 12:52:10PM +0800, Gao feng wrote:
> +
> int netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
> const struct nlmsghdr *nlh,
> struct netlink_dump_control *control)
> @@ -1786,6 +1794,7 @@ int netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
> cb->done = control->done;
> cb->nlh = nlh;
> cb->data = control->data;
> + cb->module = control->module;
> cb->min_dump_alloc = control->min_dump_alloc;
> atomic_inc(&skb->users);
> cb->skb = skb;
> @@ -1796,19 +1805,27 @@ int netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
> return -ECONNREFUSED;
> }
> nlk = nlk_sk(sk);
> - /* A dump is in progress... */
> +
> mutex_lock(nlk->cb_mutex);
> + /* A dump is in progress... */
> if (nlk->cb) {
> mutex_unlock(nlk->cb_mutex);
> netlink_destroy_callback(cb);
> - sock_put(sk);
> - return -EBUSY;
> + ret = -EBUSY;
> + goto out;
> + }
> + /* add reference of module witch cb->dump belone to */
> + if (cb->module && !try_module_get(cb->module)) {
> + mutex_unlock(nlk->cb_mutex);
> + ret = -EPROTONOSUPPORT;
> + goto out;
Looks like you leak the allocated netlink_callback here.
You should call netlink_destroy_callback() before you exit.
> }
> +
> nlk->cb = cb;
> mutex_unlock(nlk->cb_mutex);
>
> ret = netlink_dump(sk);
> -
> +out:
> sock_put(sk);
>
> if (ret)
> --
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