Messages in this thread | | | Date | Mon, 5 Dec 2022 15:12:17 +0800 | Subject | Re: [PATCH] power: supply: fix null pointer dereferencing in power_supply_get_battery_info | From | Baolin Wang <> |
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Hi,
On 12/4/2022 10:38 AM, 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 directly 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> > --- > drivers/power/supply/power_supply_core.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/drivers/power/supply/power_supply_core.c b/drivers/power/supply/power_supply_core.c > index 4b5fb172fa99..2fd6ab7a4471 100644 > --- a/drivers/power/supply/power_supply_core.c > +++ b/drivers/power/supply/power_supply_core.c > @@ -750,6 +750,8 @@ 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) > + return -ENOMEM;
Please read the code carefully, you can not just return error number without releasing resource.
> list = of_get_property(battery_np, propname, &size); > if (!list || !size) { > dev_err(&psy->dev, "failed to get %s\n", propname);
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