6.6-stable review patch. If anyone has any objections, please let me know.
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From: Chen Yufeng chenyufeng@iie.ac.cn
[ Upstream commit 6b696808472197b77b888f50bc789a3bae077743 ]
This issue is similar to the vulnerability in the `mcp251x` driver, which was fixed in commit 03c427147b2d ("can: mcp251x: fix resume from sleep before interface was brought up").
In the `hi311x` driver, when the device resumes from sleep, the driver schedules `priv->restart_work`. However, if the network interface was not previously enabled, the `priv->wq` (workqueue) is not allocated and initialized, leading to a null pointer dereference.
To fix this, we move the allocation and initialization of the workqueue from the `hi3110_open` function to the `hi3110_can_probe` function. This ensures that the workqueue is properly initialized before it is used during device resume. And added logic to destroy the workqueue in the error handling paths of `hi3110_can_probe` and in the `hi3110_can_remove` function to prevent resource leaks.
Signed-off-by: Chen Yufeng chenyufeng@iie.ac.cn Link: https://patch.msgid.link/20250911150820.250-1-chenyufeng@iie.ac.cn Signed-off-by: Marc Kleine-Budde mkl@pengutronix.de Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/can/spi/hi311x.c | 33 +++++++++++++++++---------------- 1 file changed, 17 insertions(+), 16 deletions(-)
diff --git a/drivers/net/can/spi/hi311x.c b/drivers/net/can/spi/hi311x.c index 57ea7dfe8a596..1acd4fc7adc8b 100644 --- a/drivers/net/can/spi/hi311x.c +++ b/drivers/net/can/spi/hi311x.c @@ -545,8 +545,6 @@ static int hi3110_stop(struct net_device *net)
priv->force_quit = 1; free_irq(spi->irq, priv); - destroy_workqueue(priv->wq); - priv->wq = NULL;
mutex_lock(&priv->hi3110_lock);
@@ -771,34 +769,23 @@ static int hi3110_open(struct net_device *net) goto out_close; }
- priv->wq = alloc_workqueue("hi3110_wq", WQ_FREEZABLE | WQ_MEM_RECLAIM, - 0); - if (!priv->wq) { - ret = -ENOMEM; - goto out_free_irq; - } - INIT_WORK(&priv->tx_work, hi3110_tx_work_handler); - INIT_WORK(&priv->restart_work, hi3110_restart_work_handler); - ret = hi3110_hw_reset(spi); if (ret) - goto out_free_wq; + goto out_free_irq;
ret = hi3110_setup(net); if (ret) - goto out_free_wq; + goto out_free_irq;
ret = hi3110_set_normal_mode(spi); if (ret) - goto out_free_wq; + goto out_free_irq;
netif_wake_queue(net); mutex_unlock(&priv->hi3110_lock);
return 0;
- out_free_wq: - destroy_workqueue(priv->wq); out_free_irq: free_irq(spi->irq, priv); hi3110_hw_sleep(spi); @@ -915,6 +902,15 @@ static int hi3110_can_probe(struct spi_device *spi) if (ret) goto out_clk;
+ priv->wq = alloc_workqueue("hi3110_wq", WQ_FREEZABLE | WQ_MEM_RECLAIM, + 0); + if (!priv->wq) { + ret = -ENOMEM; + goto out_clk; + } + INIT_WORK(&priv->tx_work, hi3110_tx_work_handler); + INIT_WORK(&priv->restart_work, hi3110_restart_work_handler); + priv->spi = spi; mutex_init(&priv->hi3110_lock);
@@ -950,6 +946,8 @@ static int hi3110_can_probe(struct spi_device *spi) return 0;
error_probe: + destroy_workqueue(priv->wq); + priv->wq = NULL; hi3110_power_enable(priv->power, 0);
out_clk: @@ -970,6 +968,9 @@ static void hi3110_can_remove(struct spi_device *spi)
hi3110_power_enable(priv->power, 0);
+ destroy_workqueue(priv->wq); + priv->wq = NULL; + clk_disable_unprepare(priv->clk);
free_candev(net);