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can: m_can: Release irq on error in m_can_open

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[ Upstream commit 06d4ef3056 ]

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: eaacfeaca7 ("can: m_can: Call the RAM init directly from m_can_chip_config")
Acked-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Simon Horman <horms@kernel.org>
Link: https://lore.kernel.org/all/20240805-mcan-irq-v2-1-7154c0484819@kernel.org
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Simon Horman 2024-08-05 15:01:58 +01:00 committed by Greg Kroah-Hartman
parent 4377b79323
commit db5aca78e2
1 changed files with 4 additions and 1 deletions
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5
drivers/net/can/m_can/m_can.c
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@ -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);