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SubjectRe: [Patch v2 1/2] libiscsi: Fix use-after-free race during iscsi_session_teardown

Looks good to me, fixes up the code given that the comment there about
calling iscsi_remove_session wasn't being followed.

Thanks

Acked-by: Chris Leech <cleech@redhat.com>

On Thu, Jul 13, 2017 at 09:11:21AM -0700, 'Khazhismel Kumykov' via open-iscsi wrote:
> Session attributes exposed through sysfs were freed before the device
> was destroyed, resulting in a potential use-after-free. Free these
> attributes after removing the device.
>
> Signed-off-by: Khazhismel Kumykov <khazhy@google.com>
> ---
> drivers/scsi/libiscsi.c | 8 ++++----
> 1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
> index 42381adf0769..8696a51a5a0c 100644
> --- a/drivers/scsi/libiscsi.c
> +++ b/drivers/scsi/libiscsi.c
> @@ -2851,9 +2851,6 @@ EXPORT_SYMBOL_GPL(iscsi_session_setup);
> /**
> * iscsi_session_teardown - destroy session, host, and cls_session
> * @cls_session: iscsi session
> - *
> - * The driver must have called iscsi_remove_session before
> - * calling this.
> */
> void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
> {
> @@ -2863,6 +2860,8 @@ void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
>
> iscsi_pool_free(&session->cmdpool);
>
> + iscsi_remove_session(cls_session);
> +
> kfree(session->password);
> kfree(session->password_in);
> kfree(session->username);
> @@ -2877,7 +2876,8 @@ void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
> kfree(session->portal_type);
> kfree(session->discovery_parent_type);
>
> - iscsi_destroy_session(cls_session);
> + iscsi_free_session(cls_session);
> +
> iscsi_host_dec_session_cnt(shost);
> module_put(owner);
> }
> --
> 2.13.2.932.g7449e964c-goog
>
> --
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