linux-kernel - Re: [PATCH 112/190] Revert "libnvdimm/namespace: Fix a potential NULL pointer dereference"

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Date:   Fri, 23 Apr 2021 13:57:00 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Kangjie Lu <kjlu@....edu>
Subject: Re: [PATCH 112/190] Revert "libnvdimm/namespace: Fix a potential NULL
 pointer dereference"

On Wed, Apr 21, 2021 at 6:08 AM Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
>
> This reverts commit 55c1fc0af29a6c1b92f217b7eb7581a882e0c07c.
>
> Commits from @umn.edu addresses have been found to be submitted in "bad
> faith" to try to test the kernel community's ability to review "known
> malicious" changes.  The result of these submissions can be found in a
> paper published at the 42nd IEEE Symposium on Security and Privacy
> entitled, "Open Source Insecurity: Stealthily Introducing
> Vulnerabilities via Hypocrite Commits" written by Qiushi Wu (University
> of Minnesota) and Kangjie Lu (University of Minnesota).
>
> Because of this, all submissions from this group must be reverted from
> the kernel tree and will need to be re-reviewed again to determine if
> they actually are a valid fix.  Until that work is complete, remove this
> change to ensure that no problems are being introduced into the
> codebase.
>
> Cc: Kangjie Lu <kjlu@....edu>
> Cc: Dan Williams <dan.j.williams@...el.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

Upon re-review this change still looks correct, no need for a revert.

> ---
>  drivers/nvdimm/namespace_devs.c | 5 +----
>  1 file changed, 1 insertion(+), 4 deletions(-)
>
> diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
> index 2403b71b601e..04f7cb7a23b7 100644
> --- a/drivers/nvdimm/namespace_devs.c
> +++ b/drivers/nvdimm/namespace_devs.c
> @@ -2297,12 +2297,9 @@ static struct device *create_namespace_blk(struct nd_region *nd_region,
>         if (!nsblk->uuid)
>                 goto blk_err;
>         memcpy(name, nd_label->name, NSLABEL_NAME_LEN);
> -       if (name[0]) {
> +       if (name[0])
>                 nsblk->alt_name = kmemdup(name, NSLABEL_NAME_LEN,
>                                 GFP_KERNEL);
> -               if (!nsblk->alt_name)
> -                       goto blk_err;
> -       }
>         res = nsblk_add_resource(nd_region, ndd, nsblk,
>                         __le64_to_cpu(nd_label->dpa));
>         if (!res)
> --
> 2.31.1
>