This is a note to let you know that I've just added the patch titled
iscsi-target: Fix use-after-free during TPG session shutdown
to the 3.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
iscsi-target-fix-use-after-free-during-tpg-session-shutdown.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 417c20a9bdd1e876384127cf096d8ae8b559066c Mon Sep 17 00:00:00 2001
From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
Date: Wed, 22 Jul 2015 00:24:09 -0700
Subject: iscsi-target: Fix use-after-free during TPG session shutdown
From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
commit 417c20a9bdd1e876384127cf096d8ae8b559066c upstream.
This patch fixes a use-after-free bug in iscsit_release_sessions_for_tpg()
where se_portal_group->session_lock was incorrectly released/re-acquired
while walking the active se_portal_group->tpg_sess_list.
The can result in a NULL pointer dereference when iscsit_close_session()
shutdown happens in the normal path asynchronously to this code, causing
a bogus dereference of an already freed list entry to occur.
To address this bug, walk the session list checking for the same state
as before, but move entries to a local list to avoid dropping the lock
while walking the active list.
As before, signal using iscsi_session->session_restatement=1 for those
list entries to be released locally by iscsit_free_session() code.
Reported-by: Sunilkumar Nadumuttlu <sjn@xxxxxxxxx>
Cc: Sunilkumar Nadumuttlu <sjn@xxxxxxxxx>
Signed-off-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/target/iscsi/iscsi_target.c | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)
--- a/drivers/target/iscsi/iscsi_target.c
+++ b/drivers/target/iscsi/iscsi_target.c
@@ -4709,6 +4709,7 @@ int iscsit_release_sessions_for_tpg(stru
struct iscsi_session *sess;
struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
struct se_session *se_sess, *se_sess_tmp;
+ LIST_HEAD(free_list);
int session_count = 0;
spin_lock_bh(&se_tpg->session_lock);
@@ -4730,14 +4731,17 @@ int iscsit_release_sessions_for_tpg(stru
}
atomic_set(&sess->session_reinstatement, 1);
spin_unlock(&sess->conn_lock);
- spin_unlock_bh(&se_tpg->session_lock);
- iscsit_free_session(sess);
- spin_lock_bh(&se_tpg->session_lock);
+ list_move_tail(&se_sess->sess_list, &free_list);
+ }
+ spin_unlock_bh(&se_tpg->session_lock);
+ list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
+ sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
+
+ iscsit_free_session(sess);
session_count++;
}
- spin_unlock_bh(&se_tpg->session_lock);
pr_debug("Released %d iSCSI Session(s) from Target Portal"
" Group: %hu\n", session_count, tpg->tpgt);
Patches currently in stable-queue which might be from nab@xxxxxxxxxxxxxxx are
queue-3.14/iscsi-target-fix-iser-explicit-logout-tx-kthread-leak.patch
queue-3.14/iscsi-target-fix-use-after-free-during-tpg-session-shutdown.patch
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