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Subject[PATCH 4.1 21/78] HID: hid-input: Fix accessing freed memory during device disconnect
4.1-stable review patch.  If anyone has any objections, please let me know.


From: Krzysztof Kozlowski <>

commit 0621809e37936e7c2b3eac9165cf2aad7f9189eb upstream.

During unbinding the driver was dereferencing a pointer to memory
already freed by power_supply_unregister().

Driver was freeing its internal description of battery through pointers
stored in power_supply structure. However, because the core owns the
power supply instance, after calling power_supply_unregister() this
memory is freed and the driver cannot access these members.

Fix this by storing the pointer to internal description of battery in a
local variable before calling power_supply_unregister(), so the pointer
remains valid.

Signed-off-by: Krzysztof Kozlowski <>
Reported-by: H.J. Lu <>
Fixes: 297d716f6260 ("power_supply: Change ownership from driver to core")
Reviewed-by: Dmitry Torokhov <>
Signed-off-by: Jiri Kosina <>
Signed-off-by: Greg Kroah-Hartman <>

drivers/hid/hid-input.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)

--- a/drivers/hid/hid-input.c
+++ b/drivers/hid/hid-input.c
@@ -462,12 +462,15 @@ out:

static void hidinput_cleanup_battery(struct hid_device *dev)
+ const struct power_supply_desc *psy_desc;
if (!dev->battery)

+ psy_desc = dev->battery->desc;
- kfree(dev->battery->desc->name);
- kfree(dev->battery->desc);
+ kfree(psy_desc->name);
+ kfree(psy_desc);
dev->battery = NULL;

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