* [PATCH] mfd: wm831x-auxadc: Prevent use after free in wm831x_auxadc_read_irq()
@ 2020-12-14 11:59 Dan Carpenter
2020-12-14 13:41 ` Charles Keepax
0 siblings, 1 reply; 2+ messages in thread
From: Dan Carpenter @ 2020-12-14 11:59 UTC (permalink / raw)
To: Lee Jones
Cc: Mark Brown, Samuel Ortiz, patches, linux-kernel, kernel-janitors
The "req" struct is always added to the "wm831x->auxadc_pending" list,
but it's only removed from the list on the success path. If a failure
occurs then the "req" struct is freed but it's still on the list,
leading to a use after free.
Fixes: 78bb3688ea18 ("mfd: Support multiple active WM831x AUXADC conversions")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
drivers/mfd/wm831x-auxadc.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/mfd/wm831x-auxadc.c b/drivers/mfd/wm831x-auxadc.c
index 8a7cc0f86958..65b98f3fbd92 100644
--- a/drivers/mfd/wm831x-auxadc.c
+++ b/drivers/mfd/wm831x-auxadc.c
@@ -93,11 +93,10 @@ static int wm831x_auxadc_read_irq(struct wm831x *wm831x,
wait_for_completion_timeout(&req->done, msecs_to_jiffies(500));
mutex_lock(&wm831x->auxadc_lock);
-
- list_del(&req->list);
ret = req->val;
out:
+ list_del(&req->list);
mutex_unlock(&wm831x->auxadc_lock);
kfree(req);
--
2.29.2
^ permalink raw reply related [flat|nested] 2+ messages in thread* Re: [PATCH] mfd: wm831x-auxadc: Prevent use after free in wm831x_auxadc_read_irq()
2020-12-14 11:59 [PATCH] mfd: wm831x-auxadc: Prevent use after free in wm831x_auxadc_read_irq() Dan Carpenter
@ 2020-12-14 13:41 ` Charles Keepax
0 siblings, 0 replies; 2+ messages in thread
From: Charles Keepax @ 2020-12-14 13:41 UTC (permalink / raw)
To: Dan Carpenter
Cc: Lee Jones, Mark Brown, Samuel Ortiz, patches, linux-kernel,
kernel-janitors
On Mon, Dec 14, 2020 at 02:59:10PM +0300, Dan Carpenter wrote:
> The "req" struct is always added to the "wm831x->auxadc_pending" list,
> but it's only removed from the list on the success path. If a failure
> occurs then the "req" struct is freed but it's still on the list,
> leading to a use after free.
>
> Fixes: 78bb3688ea18 ("mfd: Support multiple active WM831x AUXADC conversions")
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
> ---
Acked-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Thanks,
Charles
^ permalink raw reply [flat|nested] 2+ messages in thread
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2020-12-14 11:59 [PATCH] mfd: wm831x-auxadc: Prevent use after free in wm831x_auxadc_read_irq() Dan Carpenter
2020-12-14 13:41 ` Charles Keepax
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