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linux-can-fixes-for-6.4-20230605

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Merge tag 'linux-can-fixes-for-6.4-20230605' of git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can

Marc Kleine-Budde says:

====================

this is a pull request of 3 patches for net/master.

All 3 patches target the j1939 stack.

The 1st patch is by Oleksij Rempel and fixes the error queue handling
for (E)TP sessions that run into timeouts.

The last 2 patches are by Fedor Pchelkin and fix a potential
use-after-free in j1939_netdev_start() if j1939_can_rx_register()
fails.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2023-06-05 11:21:10 +01:00
commit d753693101
2 changed files with 18 additions and 11 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

24
net/can/j1939/main.c
View file

@ -126,7 +126,7 @@ static void j1939_can_recv(struct sk_buff *iskb, void *data)
#define J1939_CAN_ID CAN_EFF_FLAG
#define J1939_CAN_MASK (CAN_EFF_FLAG | CAN_RTR_FLAG)
static DEFINE_SPINLOCK(j1939_netdev_lock);
static DEFINE_MUTEX(j1939_netdev_lock);
static struct j1939_priv *j1939_priv_create(struct net_device *ndev)
{
@ -220,7 +220,7 @@ static void __j1939_rx_release(struct kref *kref)
j1939_can_rx_unregister(priv);
j1939_ecu_unmap_all(priv);
j1939_priv_set(priv->ndev, NULL);
spin_unlock(&j1939_netdev_lock);
mutex_unlock(&j1939_netdev_lock);
}
/* get pointer to priv without increasing ref counter */
@ -248,9 +248,9 @@ static struct j1939_priv *j1939_priv_get_by_ndev(struct net_device *ndev)
{
struct j1939_priv *priv;
spin_lock(&j1939_netdev_lock);
mutex_lock(&j1939_netdev_lock);
priv = j1939_priv_get_by_ndev_locked(ndev);
spin_unlock(&j1939_netdev_lock);
mutex_unlock(&j1939_netdev_lock);
return priv;
}
@ -260,14 +260,14 @@ struct j1939_priv *j1939_netdev_start(struct net_device *ndev)
struct j1939_priv *priv, *priv_new;
int ret;
spin_lock(&j1939_netdev_lock);
mutex_lock(&j1939_netdev_lock);
priv = j1939_priv_get_by_ndev_locked(ndev);
if (priv) {
kref_get(&priv->rx_kref);
spin_unlock(&j1939_netdev_lock);
mutex_unlock(&j1939_netdev_lock);
return priv;
}
spin_unlock(&j1939_netdev_lock);
mutex_unlock(&j1939_netdev_lock);
priv = j1939_priv_create(ndev);
if (!priv)
@ -277,29 +277,31 @@ struct j1939_priv *j1939_netdev_start(struct net_device *ndev)
spin_lock_init(&priv->j1939_socks_lock);
INIT_LIST_HEAD(&priv->j1939_socks);
spin_lock(&j1939_netdev_lock);
mutex_lock(&j1939_netdev_lock);
priv_new = j1939_priv_get_by_ndev_locked(ndev);
if (priv_new) {
/* Someone was faster than us, use their priv and roll
* back our's.
*/
kref_get(&priv_new->rx_kref);
spin_unlock(&j1939_netdev_lock);
mutex_unlock(&j1939_netdev_lock);
dev_put(ndev);
kfree(priv);
return priv_new;
}
j1939_priv_set(ndev, priv);
spin_unlock(&j1939_netdev_lock);
ret = j1939_can_rx_register(priv);
if (ret < 0)
goto out_priv_put;
mutex_unlock(&j1939_netdev_lock);
return priv;
out_priv_put:
j1939_priv_set(ndev, NULL);
mutex_unlock(&j1939_netdev_lock);
dev_put(ndev);
kfree(priv);
@ -308,7 +310,7 @@ struct j1939_priv *j1939_netdev_start(struct net_device *ndev)
void j1939_netdev_stop(struct j1939_priv *priv)
{
kref_put_lock(&priv->rx_kref, __j1939_rx_release, &j1939_netdev_lock);
kref_put_mutex(&priv->rx_kref, __j1939_rx_release, &j1939_netdev_lock);
j1939_priv_put(priv);
}

5
net/can/j1939/socket.c
View file

@ -1088,6 +1088,11 @@ void j1939_sk_errqueue(struct j1939_session *session,
void j1939_sk_send_loop_abort(struct sock *sk, int err)
{
struct j1939_sock *jsk = j1939_sk(sk);
if (jsk->state & J1939_SOCK_ERRQUEUE)
return;
sk->sk_err = err;
sk_error_report(sk);