linux-kernel - [Patch v2 1/2] libiscsi: Fix use-after-free race during iscsi_session

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Date:   Thu, 13 Jul 2017 09:11:21 -0700
From:   Khazhismel Kumykov <khazhy@...gle.com>
To:     lduncan@...e.com, cleech@...hat.com
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        open-iscsi@...glegroups.com, Khazhismel Kumykov <khazhy@...gle.com>
Subject: [Patch v2 1/2] libiscsi: Fix use-after-free race during iscsi_session_teardown

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@...gle.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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