This is a note to let you know that I've just added the patch titled
can: m_can: Release irq on error in m_can_open
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
can-m_can-release-irq-on-error-in-m_can_open.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 3e27a0a638f967a7387abb223db894698d6da6e2
Author: Simon Horman <horms@xxxxxxxxxx>
Date: Mon Aug 5 15:01:58 2024 +0100
can: m_can: Release irq on error in m_can_open
[ Upstream commit 06d4ef3056a7ac31be331281bb7a6302ef5a7f8a ]
It appears that the irq requested in m_can_open() may be leaked
if an error subsequently occurs: if m_can_start() fails.
Address this by calling free_irq in the unwind path for
such cases.
Flagged by Smatch.
Compile tested only.
Fixes: eaacfeaca7ad ("can: m_can: Call the RAM init directly from m_can_chip_config")
Acked-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
Signed-off-by: Simon Horman <horms@xxxxxxxxxx>
Link: https://lore.kernel.org/all/20240805-mcan-irq-v2-1-7154c0484819@xxxxxxxxxx
Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
index 2395b1225cc8..fb77fd74de27 100644
--- a/drivers/net/can/m_can/m_can.c
+++ b/drivers/net/can/m_can/m_can.c
@@ -1871,7 +1871,7 @@ static int m_can_open(struct net_device *dev)
/* start the m_can controller */
err = m_can_start(dev);
if (err)
- goto exit_irq_fail;
+ goto exit_start_fail;
if (!cdev->is_peripheral)
napi_enable(&cdev->napi);
@@ -1880,6 +1880,9 @@ static int m_can_open(struct net_device *dev)
return 0;
+exit_start_fail:
+ if (cdev->is_peripheral || dev->irq)
+ free_irq(dev->irq, dev);
exit_irq_fail:
if (cdev->is_peripheral)
destroy_workqueue(cdev->tx_wq);
