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SubjectRe: [PATCH] exec: setup_arg_pages fails to return errors
Quoting Anton Blanchard (anton@samba.org):
>
> 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@samba.org>

Yikes!

Acked-by: Serge Hallyn <serue@us.ibm.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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