when kmalloc() fail to allocate memory in kasprintf(), propname
will be NULL, strcmp() called by of_get_property() will cause
null pointer dereference.

So return ENOMEM if kasprintf() return NULL pointer.

Fixes: 3afb50d7125b ("power: supply: core: Add some helpers to use the battery OCV capacity table")
Signed-off-by: ruanjinjie <ruanjinjie@huawei.com>
---
v2:
- release resource instead of just returning error number
---
 drivers/power/supply/power_supply_core.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/power/supply/power_supply_core.c b/drivers/power/supply/power_supply_core.c
index 4b5fb172fa99..afbe9eecfc30 100644
--- a/drivers/power/supply/power_supply_core.c
+++ b/drivers/power/supply/power_supply_core.c
@@ -750,6 +750,11 @@ int power_supply_get_battery_info(struct power_supply *psy,
 		int i, tab_len, size;
 
 		propname = kasprintf(GFP_KERNEL, "ocv-capacity-table-%d", index);
+		if (!propname) {
+			power_supply_put_battery_info(psy, info);
+			err = -ENOMEM;
+			goto out_put_node;
+		}
 		list = of_get_property(battery_np, propname, &size);
 		if (!list || !size) {
 			dev_err(&psy->dev, "failed to get %s\n", propname);
-- 
2.25.1

On 12/5/2022 3:51 PM, ruanjinjie wrote:
> when kmalloc() fail to allocate memory in kasprintf(), propname
> will be NULL, strcmp() called by of_get_property() will cause
> null pointer dereference.
> 
> So return ENOMEM if kasprintf() return NULL pointer.
> 
> Fixes: 3afb50d7125b ("power: supply: core: Add some helpers to use the battery OCV capacity table")
> Signed-off-by: ruanjinjie <ruanjinjie@huawei.com>

LGTM.
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>

> ---
> v2:
> - release resource instead of just returning error number
> ---
>   drivers/power/supply/power_supply_core.c | 5 +++++
>   1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/power/supply/power_supply_core.c b/drivers/power/supply/power_supply_core.c
> index 4b5fb172fa99..afbe9eecfc30 100644
> --- a/drivers/power/supply/power_supply_core.c
> +++ b/drivers/power/supply/power_supply_core.c
> @@ -750,6 +750,11 @@ int power_supply_get_battery_info(struct power_supply *psy,
>   		int i, tab_len, size;
>   
>   		propname = kasprintf(GFP_KERNEL, "ocv-capacity-table-%d", index);
> +		if (!propname) {
> +			power_supply_put_battery_info(psy, info);
> +			err = -ENOMEM;
> +			goto out_put_node;
> +		}
>   		list = of_get_property(battery_np, propname, &size);
>   		if (!list || !size) {
>   			dev_err(&psy->dev, "failed to get %s\n", propname);

Hi,

On Mon, Dec 05, 2022 at 07:05:04PM +0800, Baolin Wang wrote:
> On 12/5/2022 3:51 PM, ruanjinjie wrote:
> > when kmalloc() fail to allocate memory in kasprintf(), propname
> > will be NULL, strcmp() called by of_get_property() will cause
> > null pointer dereference.
> > 
> > So return ENOMEM if kasprintf() return NULL pointer.
> > 
> > Fixes: 3afb50d7125b ("power: supply: core: Add some helpers to use the battery OCV capacity table")
> > Signed-off-by: ruanjinjie <ruanjinjie@huawei.com>
> 
> LGTM.
> Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>

Thanks, queued.

-- Sebastian

> 
> > ---
> > v2:
> > - release resource instead of just returning error number
> > ---
> >   drivers/power/supply/power_supply_core.c | 5 +++++
> >   1 file changed, 5 insertions(+)
> > 
> > diff --git a/drivers/power/supply/power_supply_core.c b/drivers/power/supply/power_supply_core.c
> > index 4b5fb172fa99..afbe9eecfc30 100644
> > --- a/drivers/power/supply/power_supply_core.c
> > +++ b/drivers/power/supply/power_supply_core.c
> > @@ -750,6 +750,11 @@ int power_supply_get_battery_info(struct power_supply *psy,
> >   		int i, tab_len, size;
> >   		propname = kasprintf(GFP_KERNEL, "ocv-capacity-table-%d", index);
> > +		if (!propname) {
> > +			power_supply_put_battery_info(psy, info);
> > +			err = -ENOMEM;
> > +			goto out_put_node;
> > +		}
> >   		list = of_get_property(battery_np, propname, &size);
> >   		if (!list || !size) {
> >   			dev_err(&psy->dev, "failed to get %s\n", propname);