[lvm-devel] [PATCH 04/29] Reset vg pointer after release

[Petr Rockai]

Zdenek Kabelac <zkabelac at redhat.com> writes:

> Set vg to NULL after releasing it as the following memlock() test may
> lead to goto for the second call of vg_release() with the same vg pointer.
Ack.

> Signed-off-by: Zdenek Kabelac <zkabelac at redhat.com>
> ---
>  lib/metadata/metadata.c |    1 +
>  1 files changed, 1 insertions(+), 0 deletions(-)
>
> diff --git a/lib/metadata/metadata.c b/lib/metadata/metadata.c
> index 780b806..743d633 100644
> --- a/lib/metadata/metadata.c
> +++ b/lib/metadata/metadata.c
> @@ -3117,6 +3117,7 @@ static struct volume_group *_vg_read_by_vgid(struct cmd_context *cmd,
>  			return vg;
>  		}
>  		vg_release(vg);
> +		vg = NULL; /* reset so memlock goto out is safe */
>  	}
>  
>  	/* Mustn't scan if memory locked: ensure cache gets pre-populated! */