power: supply: fix null pointer dereferencing in power_supply_get_battery_info

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>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

diff --git a/drivers/power/supply/power_supply_core.c b/drivers/power/supply/power_supply_core.c
index 00cb19b46001cfd288d63d88b7be6be5e1d45d7d..7c790c41e2fe31a7b2ff9807c5b0dec5a685b5e4 100644 (file)
--- 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);