[PATCH 4.9 086/145] hippi: Fix a Fix a possible sleep-in-atomic bug in rr_close

From: Greg Kroah-Hartman
Date: Fri Feb 23 2018 - 13:47:58 EST


4.9-stable review patch. If anyone has any objections, please let me know.

------------------

From: Jia-Ju Bai <baijiaju1990@xxxxxxx>


[ 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@xxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/hippi/rrunner.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/hippi/rrunner.c
+++ b/drivers/net/hippi/rrunner.c
@@ -1381,8 +1381,8 @@ static int rr_close(struct net_device *d
rrpriv->info_dma);
rrpriv->info = NULL;

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

return 0;
}