linux-kernel - Re: [PATCH] exec: setup_arg_pages fails to return errors

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Date:	Wed, 21 Oct 2009 12:47:47 +0800
From:	Américo Wang <xiyou.wangcong@...il.com>
To:	Anton Blanchard <anton@...ba.org>
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Subject: Re: [PATCH] exec: setup_arg_pages fails to return errors

On Sun, Oct 18, 2009 at 7:39 PM, Anton Blanchard <anton@...ba.org> wrote:
>
> In setup_arg_pages we work hard to assign a value to ret, but on exit
> we always return 0.
>
> Also remove a now duplicated exit path and branch to out_unlock instead.
>
> Signed-off-by: Anton Blanchard <anton@...ba.org>
> ---


Reviewed-by: WANG Cong <xiyou.wangcong@...il.com>

>
> Index: linux.trees.git/fs/exec.c
> ===================================================================
> --- linux.trees.git.orig/fs/exec.c      2009-09-28 12:17:10.000000000 +1000
> +++ linux.trees.git/fs/exec.c   2009-09-28 12:17:58.000000000 +1000
> @@ -624,10 +624,8 @@ int setup_arg_pages(struct linux_binprm
>        /* Move stack pages down in memory. */
>        if (stack_shift) {
>                ret = shift_arg_pages(vma, stack_shift);
> -               if (ret) {
> -                       up_write(&mm->mmap_sem);
> -                       return ret;
> -               }
> +               if (ret)
> +                       goto out_unlock;
>        }
>
>  #ifdef CONFIG_STACK_GROWSUP
> @@ -641,7 +639,7 @@ int setup_arg_pages(struct linux_binprm
>
>  out_unlock:
>        up_write(&mm->mmap_sem);
> -       return 0;
> +       return ret;
>  }
>  EXPORT_SYMBOL(setup_arg_pages);
>
> --
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