lkml.org 
[lkml]   [2013]   [Nov]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] devres: Freeing the drs after all release() are called
Hello, Liu.

On Thu, Nov 07, 2013 at 12:27:56AM +0000, Liu, Chuansheng wrote:
> The driver code is as below:
> _INIT() {
>
> A = devm_kzalloc();
> B= devm_request_threaded_irq(isr_handler);
> C = devm_kzalloc();
> }
>
> When driver _EXIT, the devres_release_all () will be called.
> The C will be kfreed before B, but when freeing irq B, the pending isr_handler() possibly
> will access the memory B which has been freed.
> Then the memory corruption occurred.
>
> This patch can solve this scenario.

Isn't the bug there IRQ being requested before all its resources are
allocated? The proposed change just masks the underlying issue or
incorrectly ordered operations.

Thanks.

--
tejun


\
 
 \ /
  Last update: 2013-11-07 02:01    [W:0.064 / U:0.792 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site