Re: [PATCH] [RESEND] devres: Fix possible use after free

[Tejun Heo]

Hello, Maxin.

On Tue, Jun 14, 2011 at 03:09:34PM +0100, Maxin B John wrote:
> You are right. I shouldn't have mentioned it as dangerous. I was trying to
> make this patch description similar to the description present in the
> previous patch:
> http://www.spinics.net/lists/mm-commits/msg84313.html
> 
> This patch silences the Coverity Prevent's complains about this as
> use-after-free bug. Please let me know if the updated patch description is OK.
> 
> "
> A freed pointer is passed as an argument to the function "devres_destroy()" in
> "kernel/irq/devres.c" and "lib/devres.c". This patch fixes the possible use
> after free.
> The change silences the static analysis tool (Coverity Prevent) complains
> about this as use-after-free bug.
> "

Yeap, sounds mostly okay but there's no 'possible use after free'.
Maybe something like, "devres uses the pointer value as key after it's
freed, which is safe but triggers spurious use-after-free warnings on
some static analysis tools.  Rearrange code to avoid such warnings".

Thanks.

-- 
tejun
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