Re: [PATCH v3] ceph: avoid putting the realm twice when decoding snaps fails

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On Tue, Nov 8, 2022 at 2:46 PM <xiubli@xxxxxxxxxx> wrote:
>
> From: Xiubo Li <xiubli@xxxxxxxxxx>
>
> When decoding the snaps fails it maybe leaving the 'first_realm'
> and 'realm' pointing to the same snaprealm memory. And then it'll
> put it twice and could cause random use-after-free, BUG_ON, etc
> issues.
>
> Cc: stable@xxxxxxxxxxxxxxx
> URL: https://tracker.ceph.com/issues/57686
> Signed-off-by: Xiubo Li <xiubli@xxxxxxxxxx>
> ---
>  fs/ceph/snap.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/fs/ceph/snap.c b/fs/ceph/snap.c
> index 9bceed2ebda3..f5b0fa1ff705 100644
> --- a/fs/ceph/snap.c
> +++ b/fs/ceph/snap.c
> @@ -775,6 +775,7 @@ int ceph_update_snap_trace(struct ceph_mds_client *mdsc,
>
>         dout("%s deletion=%d\n", __func__, deletion);
>  more:
> +       realm = NULL;

Nit: realm doesn't need to be initialized anymore, I would drop that.

Thanks,

                Ilya



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