diff options
| author | Stefan Wahren <wahrenst@gmx.net> | 2023-12-06 15:12:20 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-12-20 15:38:00 +0100 |
| commit | 9ee9347382ea11f09ee9bbf1e5d07592f8a62eea (patch) | |
| tree | 03873dcd397c05840e295b7a7f2c3ef6d1f3c2ab | |
| parent | f93c1f58eb68bada8c86088104efe14cfe735957 (diff) | |
qca_debug: Prevent crash on TX ring changes
[ Upstream commit f4e6064c97c050bd9904925ff7d53d0c9954fc7b ]
The qca_spi driver stop and restart the SPI kernel thread
(via ndo_stop & ndo_open) in case of TX ring changes. This is
a big issue because it allows userspace to prevent restart of
the SPI kernel thread (via signals). A subsequent change of
TX ring wrongly assume a valid spi_thread pointer which result
in a crash.
So prevent this by stopping the network traffic handling and
temporary park the SPI thread.
Fixes: 291ab06ecf67 ("net: qualcomm: new Ethernet over SPI driver for QCA7000")
Signed-off-by: Stefan Wahren <wahrenst@gmx.net>
Link: https://lore.kernel.org/r/20231206141222.52029-2-wahrenst@gmx.net
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | drivers/net/ethernet/qualcomm/qca_debug.c | 9 | ||||
| -rw-r--r-- | drivers/net/ethernet/qualcomm/qca_spi.c | 12 |
2 files changed, 16 insertions, 5 deletions
diff --git a/drivers/net/ethernet/qualcomm/qca_debug.c b/drivers/net/ethernet/qualcomm/qca_debug.c index 51d89c86e60f..26b0ca7a7b43 100644 --- a/drivers/net/ethernet/qualcomm/qca_debug.c +++ b/drivers/net/ethernet/qualcomm/qca_debug.c @@ -275,7 +275,6 @@ qcaspi_get_ringparam(struct net_device *dev, struct ethtool_ringparam *ring) static int qcaspi_set_ringparam(struct net_device *dev, struct ethtool_ringparam *ring) { - const struct net_device_ops *ops = dev->netdev_ops; struct qcaspi *qca = netdev_priv(dev); if ((ring->rx_pending) || @@ -283,14 +282,14 @@ qcaspi_set_ringparam(struct net_device *dev, struct ethtool_ringparam *ring) (ring->rx_jumbo_pending)) return -EINVAL; - if (netif_running(dev)) - ops->ndo_stop(dev); + if (qca->spi_thread) + kthread_park(qca->spi_thread); qca->txr.count = max_t(u32, ring->tx_pending, TX_RING_MIN_LEN); qca->txr.count = min_t(u16, qca->txr.count, TX_RING_MAX_LEN); - if (netif_running(dev)) - ops->ndo_open(dev); + if (qca->spi_thread) + kthread_unpark(qca->spi_thread); return 0; } diff --git a/drivers/net/ethernet/qualcomm/qca_spi.c b/drivers/net/ethernet/qualcomm/qca_spi.c index 3e6095f0cb5f..656e2955fb79 100644 --- a/drivers/net/ethernet/qualcomm/qca_spi.c +++ b/drivers/net/ethernet/qualcomm/qca_spi.c @@ -552,6 +552,18 @@ qcaspi_spi_thread(void *data) netdev_info(qca->net_dev, "SPI thread created\n"); while (!kthread_should_stop()) { set_current_state(TASK_INTERRUPTIBLE); + if (kthread_should_park()) { + netif_tx_disable(qca->net_dev); + netif_carrier_off(qca->net_dev); + qcaspi_flush_tx_ring(qca); + kthread_parkme(); + if (qca->sync == QCASPI_SYNC_READY) { + netif_carrier_on(qca->net_dev); + netif_wake_queue(qca->net_dev); + } + continue; + } + if ((qca->intr_req == qca->intr_svc) && !qca->txr.skb[qca->txr.head]) schedule(); |