RE: [PATCH] [extcon]:remove freed groups caused the panic orwarning in unregister flow

[Liu, Chuansheng]

> -----Original Message-----
> From: Wang, Xiaoming
> Sent: Saturday, November 02, 2013 6:48 AM
> To: myungjoo.ham@xxxxxxxxxxx; cw00.choi@xxxxxxxxxxx;
> linux-kernel@xxxxxxxxxxxxxxx
> Cc: Liu, Chuansheng; Zhang, Dongxing; Wang, Xiaoming
> Subject: [PATCH] [extcon]:remove freed groups caused the panic or warning in
> unregister flow
> 
> (edev->extcon_dev_type.groups) has been freed before device_unregister.
> extcon_dev_unregister -> kfree(edev->extcon_dev_type.groups)
> then device_unregister -> device_del -> device_remove_attrs
> -> device_remove_groups(dev, type->groups);
> panic because type->groups has been freed.
> 
This patch fix the panic that using the freed memory.

Tested-by: Liu, Chuansheng <chuansheng.liu@xxxxxxxxx>
Reviewed-by: Liu, Chuansheng <chuansheng.liu@xxxxxxxxx>


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