[PATCH AUTOSEL for 4.14 100/100] hippi: Fix a Fix a possible sleep-in-atomic bug in rr_close

Sasha Levin
2018-01-28T22:28:28Z

From: Jia-Ju Bai <baijiaju1990@163.com>

[ Upstream commit 6e266610eb6553cfb7e7eb5d11914bd01509c406 ]

The driver may sleep under a spinlock.
The function call path is:
rr_close (acquire the spinlock)
free_irq --> may sleep

To fix it, free_irq is moved to the place without holding the spinlock.

This bug is found by my static analysis tool(DSAC) and checked by my code review.

Signed-off-by: Jia-Ju Bai <baijiaju1990@163.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
drivers/net/hippi/rrunner.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/hippi/rrunner.c b/drivers/net/hippi/rrunner.c
index 71ddadbf2368..d7ba2b813eff 100644
--- a/drivers/net/hippi/rrunner.c
+++ b/drivers/net/hippi/rrunner.c
@@ -1381,8 +1381,8 @@ static int rr_close(struct net_device *dev)
rrpriv->info_dma);
rrpriv->info = NULL;

- free_irq(pdev->irq, dev);
spin_unlock_irqrestore(&rrpriv->lock, flags);
+ free_irq(pdev->irq, dev);

return 0;
}
--
2.11.0