* re: [PATCH net-next] drivers: net: davinci_mdio: fix potential NULL dereference in davinci_mdio_probe()
@ 2020-04-28 3:25 weiyongjun (A)
2020-04-28 7:30 ` Grygorii Strashko
0 siblings, 1 reply; 4+ messages in thread
From: weiyongjun (A) @ 2020-04-28 3:25 UTC (permalink / raw)
To: David Lechner, Grygorii Strashko, Andrew Lunn
Cc: linux-omap, netdev, kernel-janitors
>
> On 4/27/20 4:40 AM, Wei Yongjun wrote:
> > platform_get_resource() may fail and return NULL, so we should better
> > check it's return value to avoid a NULL pointer dereference a bit
> > later in the code.
> >
> > This is detected by Coccinelle semantic patch.
> >
> > @@
> > expression pdev, res, n, t, e, e1, e2; @@
> >
> > res = \(platform_get_resource\|platform_get_resource_byname\)(pdev, t, n);
> > + if (!res)
> > + return -EINVAL;
> > ... when != res == NULL
> > e = devm_ioremap(e1, res->start, e2);
> >
> > Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
> > ---
>
> Could we use devm_platform_ioremap_resource() instead?
We cannot use devm_platform_ioremap_resource() here, see
Commit 03f66f067560 ("net: ethernet: ti: davinci_mdio: use devm_ioremap()")
Regards
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH net-next] drivers: net: davinci_mdio: fix potential NULL dereference in davinci_mdio_probe()
2020-04-28 3:25 [PATCH net-next] drivers: net: davinci_mdio: fix potential NULL dereference in davinci_mdio_probe() weiyongjun (A)
@ 2020-04-28 7:30 ` Grygorii Strashko
0 siblings, 0 replies; 4+ messages in thread
From: Grygorii Strashko @ 2020-04-28 7:30 UTC (permalink / raw)
To: weiyongjun (A), David Lechner, Andrew Lunn
Cc: linux-omap, netdev, kernel-janitors
On 28/04/2020 06:25, weiyongjun (A) wrote:
>>
>> On 4/27/20 4:40 AM, Wei Yongjun wrote:
>>> platform_get_resource() may fail and return NULL, so we should better
>>> check it's return value to avoid a NULL pointer dereference a bit
>>> later in the code.
>>>
>>> This is detected by Coccinelle semantic patch.
>>>
>>> @@
>>> expression pdev, res, n, t, e, e1, e2; @@
>>>
>>> res = \(platform_get_resource\|platform_get_resource_byname\)(pdev, t, n);
>>> + if (!res)
>>> + return -EINVAL;
>>> ... when != res == NULL
>>> e = devm_ioremap(e1, res->start, e2);
>>>
>>> Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
>>> ---
>>
>> Could we use devm_platform_ioremap_resource() instead?
>
> We cannot use devm_platform_ioremap_resource() here, see
> Commit 03f66f067560 ("net: ethernet: ti: davinci_mdio: use devm_ioremap()")
Correct, could you add fixed tag as above commit actually introduced an issue:
devm_ioremap_resource() checks input parameters for null.
Reviewed-by: Grygorii Strashko <grygorii.strashko@ti.com>
--
Best regards,
grygorii
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH net-next] drivers: net: davinci_mdio: fix potential NULL dereference in davinci_mdio_probe()
2020-04-27 9:40 Wei Yongjun
@ 2020-04-27 15:16 ` David Lechner
0 siblings, 0 replies; 4+ messages in thread
From: David Lechner @ 2020-04-27 15:16 UTC (permalink / raw)
To: Wei Yongjun, Grygorii Strashko, Andrew Lunn
Cc: linux-omap, netdev, kernel-janitors
On 4/27/20 4:40 AM, Wei Yongjun wrote:
> platform_get_resource() may fail and return NULL, so we should
> better check it's return value to avoid a NULL pointer dereference
> a bit later in the code.
>
> This is detected by Coccinelle semantic patch.
>
> @@
> expression pdev, res, n, t, e, e1, e2;
> @@
>
> res = \(platform_get_resource\|platform_get_resource_byname\)(pdev, t, n);
> + if (!res)
> + return -EINVAL;
> ... when != res == NULL
> e = devm_ioremap(e1, res->start, e2);
>
> Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
> ---
> drivers/net/ethernet/ti/davinci_mdio.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/drivers/net/ethernet/ti/davinci_mdio.c b/drivers/net/ethernet/ti/davinci_mdio.c
> index 38b7f6d35759..702fdc393da0 100644
> --- a/drivers/net/ethernet/ti/davinci_mdio.c
> +++ b/drivers/net/ethernet/ti/davinci_mdio.c
> @@ -397,6 +397,8 @@ static int davinci_mdio_probe(struct platform_device *pdev)
> data->dev = dev;
>
> res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (!res)
> + return -EINVAL;
> data->regs = devm_ioremap(dev, res->start, resource_size(res));
> if (!data->regs)
> return -ENOMEM;
>
Could we use devm_platform_ioremap_resource() instead?
^ permalink raw reply [flat|nested] 4+ messages in thread
* [PATCH net-next] drivers: net: davinci_mdio: fix potential NULL dereference in davinci_mdio_probe()
@ 2020-04-27 9:40 Wei Yongjun
2020-04-27 15:16 ` David Lechner
0 siblings, 1 reply; 4+ messages in thread
From: Wei Yongjun @ 2020-04-27 9:40 UTC (permalink / raw)
To: Grygorii Strashko, Andrew Lunn, Wei Yongjun
Cc: linux-omap, netdev, kernel-janitors
platform_get_resource() may fail and return NULL, so we should
better check it's return value to avoid a NULL pointer dereference
a bit later in the code.
This is detected by Coccinelle semantic patch.
@@
expression pdev, res, n, t, e, e1, e2;
@@
res = \(platform_get_resource\|platform_get_resource_byname\)(pdev, t, n);
+ if (!res)
+ return -EINVAL;
... when != res == NULL
e = devm_ioremap(e1, res->start, e2);
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
---
drivers/net/ethernet/ti/davinci_mdio.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/net/ethernet/ti/davinci_mdio.c b/drivers/net/ethernet/ti/davinci_mdio.c
index 38b7f6d35759..702fdc393da0 100644
--- a/drivers/net/ethernet/ti/davinci_mdio.c
+++ b/drivers/net/ethernet/ti/davinci_mdio.c
@@ -397,6 +397,8 @@ static int davinci_mdio_probe(struct platform_device *pdev)
data->dev = dev;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
+ return -EINVAL;
data->regs = devm_ioremap(dev, res->start, resource_size(res));
if (!data->regs)
return -ENOMEM;
^ permalink raw reply related [flat|nested] 4+ messages in thread
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2020-04-28 3:25 [PATCH net-next] drivers: net: davinci_mdio: fix potential NULL dereference in davinci_mdio_probe() weiyongjun (A)
2020-04-28 7:30 ` Grygorii Strashko
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2020-04-27 15:16 ` David Lechner
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