* [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
2020-04-29 2:52 ` [PATCH net-next v2] " Wei Yongjun
0 siblings, 2 replies; 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
* Re: [PATCH net-next] drivers: net: davinci_mdio: fix potential NULL dereference in davinci_mdio_probe()
2020-04-27 9:40 [PATCH net-next] drivers: net: davinci_mdio: fix potential NULL dereference in davinci_mdio_probe() Wei Yongjun
@ 2020-04-27 15:16 ` David Lechner
2020-04-29 2:52 ` [PATCH net-next v2] " Wei Yongjun
1 sibling, 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 v2] drivers: net: davinci_mdio: fix potential NULL dereference in davinci_mdio_probe()
2020-04-27 9:40 [PATCH net-next] drivers: net: davinci_mdio: fix potential NULL dereference in davinci_mdio_probe() Wei Yongjun
2020-04-27 15:16 ` David Lechner
@ 2020-04-29 2:52 ` Wei Yongjun
2020-05-01 22:28 ` David Miller
1 sibling, 1 reply; 4+ messages in thread
From: Wei Yongjun @ 2020-04-29 2:52 UTC (permalink / raw)
To: Grygorii Strashko, David Lechner, 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
since devm_ioremap() does not check input parameters for null.
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);
Fixes: 03f66f067560 ("net: ethernet: ti: davinci_mdio: use devm_ioremap()")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Reviewed-by: Grygorii Strashko <grygorii.strashko@ti.com>
---
v1 -> v2: add fixes and reviewed-by
---
drivers/net/ethernet/ti/davinci_mdio.c | 8 +++-----
1 file changed, 3 insertions(+), 5 deletions(-)
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
* Re: [PATCH net-next v2] drivers: net: davinci_mdio: fix potential NULL dereference in davinci_mdio_probe()
2020-04-29 2:52 ` [PATCH net-next v2] " Wei Yongjun
@ 2020-05-01 22:28 ` David Miller
0 siblings, 0 replies; 4+ messages in thread
From: David Miller @ 2020-05-01 22:28 UTC (permalink / raw)
To: weiyongjun1; +Cc: grygorii.strashko, david, linux-omap, netdev, kernel-janitors
From: Wei Yongjun <weiyongjun1@huawei.com>
Date: Wed, 29 Apr 2020 02:52:20 +0000
> platform_get_resource() may fail and return NULL, so we should
> better check it's return value to avoid a NULL pointer dereference
> since devm_ioremap() does not check input parameters for null.
>
> 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);
>
> Fixes: 03f66f067560 ("net: ethernet: ti: davinci_mdio: use devm_ioremap()")
> Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
> Reviewed-by: Grygorii Strashko <grygorii.strashko@ti.com>
Applied.
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2020-05-01 22:28 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2020-04-27 9:40 [PATCH net-next] drivers: net: davinci_mdio: fix potential NULL dereference in davinci_mdio_probe() Wei Yongjun
2020-04-27 15:16 ` David Lechner
2020-04-29 2:52 ` [PATCH net-next v2] " Wei Yongjun
2020-05-01 22:28 ` David Miller
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