linux-kernel - Re: [PATCH] devm_memremap_release: fix memremap'd addr handling

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:	Tue, 16 Feb 2016 16:40:48 -0800
From:	Dan Williams <dan.j.williams@...el.com>
To:	Toshi Kani <toshi.kani@....com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
	Linux MM <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] devm_memremap_release: fix memremap'd addr handling

On Tue, Feb 16, 2016 at 8:30 AM, Toshi Kani <toshi.kani@....com> wrote:
> The pmem driver calls devm_memremap() to map a persistent memory
> range.  When the pmem driver is unloaded, this memremap'd range
> is not released.
>
> Fix devm_memremap_release() to handle a given memremap'd address
> properly.
>
> Signed-off-by: Toshi Kani <toshi.kani@....com>
> Cc: Dan Williams <dan.j.williams@...el.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> ---
>  kernel/memremap.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/kernel/memremap.c b/kernel/memremap.c
> index 2c468de..7a1b5c3 100644
> --- a/kernel/memremap.c
> +++ b/kernel/memremap.c
> @@ -114,7 +114,7 @@ EXPORT_SYMBOL(memunmap);
>
>  static void devm_memremap_release(struct device *dev, void *res)
>  {
> -       memunmap(res);
> +       memunmap(*(void **)res);
>  }

Ugh, yup.  Thanks Toshi!

Acked-by: Dan Williams <dan.j.williams@...el.com>