[dm-devel] [PATCH 9/9] multipath: fix segfault with disable_changed_wwids

[Shichangkuo]

> -----Original Message-----
> From: Benjamin Marzinski [mailto:bmarzins at redhat.com]
> Sent: Friday, April 07, 2017 2:17 PM
> To: device-mapper development
> Cc: Christophe Varoqui; shichangkuo 09727 (Cloud)
> Subject: [PATCH 9/9] multipath: fix segfault with disable_changed_wwids
>
> When a path wwid changes, uev_update_path was dereferencing pp->mpp
> without checking if it was NULL.
>
> Cc: Shichangkuo <shi.changkuo at h3c.com>
> Signed-off-by: Benjamin Marzinski <bmarzins at redhat.com>
> ---
>  multipathd/main.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/multipathd/main.c b/multipathd/main.c index 995e580..0c61caa
> 100644
> --- a/multipathd/main.c
> +++ b/multipathd/main.c
> @@ -1002,7 +1002,8 @@ uev_update_path (struct uevent *uev, struct
> vectors * vecs)
>                               if (!pp->wwid_changed) {
>                                       pp->wwid_changed = 1;
>                                       pp->tick = 1;
> -                                     dm_fail_path(pp->mpp->alias, pp->dev_t);
> +                                     if (pp->mpp)
> +                                             dm_fail_path(pp->mpp->alias, pp->dev_t);
>                               }
>                               goto out;
>                       } else
> --
> 1.8.3.1

Thanks a lot for your work. It looks good to me, and I will have a test on this patch.

Thanks, again.
Changkuo
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