Hi Kees,
On Tue, Mar 7, 2017 at 6:55 AM, Kees Cook <keescook@xxxxxxxxxxxx> wrote:
> Technically, it might be possible for struct pstore_info to go out of
> scope after the module_put(), so report the backend name first.
But in that case, using pstore will crash the kernel anyway, right?
If so, why pstore doesn't keep a reference until unregister?
Do I miss something?
Thanks,
Namhyung
>
> Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
> ---
> fs/pstore/platform.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c
> index 074fe85a2078..d69ef8a840b9 100644
> --- a/fs/pstore/platform.c
> +++ b/fs/pstore/platform.c
> @@ -722,10 +722,10 @@ int pstore_register(struct pstore_info *psi)
> */
> backend = psi->name;
>
> - module_put(owner);
> -
> pr_info("Registered %s as persistent store backend\n", psi->name);
>
> + module_put(owner);
> +
> return 0;
> }
> EXPORT_SYMBOL_GPL(pstore_register);
> --
> 2.7.4
>
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