linux-kernel - [PATCH 3.12 066/155] target: Fix reference leak in target_get_sess

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Message-Id: <c4fcdeb1303765cccdaf0450a62d96ac55726a3d.1428411004.git.jslaby@suse.cz>
Date:	Tue,  7 Apr 2015 14:50:35 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Bart Van Assche <bart.vanassche@...disk.com>,
	Nicholas Bellinger <nab@...ux-iscsi.org>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 066/155] target: Fix reference leak in target_get_sess_cmd() error path

From: Bart Van Assche <bart.vanassche@...disk.com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 7544e597343e2166daba3f32e4708533aa53c233 upstream.

This patch fixes a se_cmd->cmd_kref leak buf when se_sess->sess_tearing_down
is true within target_get_sess_cmd() submission path code.

This se_cmd reference leak can occur during active session shutdown when
ack_kref=1 is passed by target_submit_cmd_[map_sgls,tmr]() callers.

Signed-off-by: Bart Van Assche <bart.vanassche@...disk.com>
Signed-off-by: Nicholas Bellinger <nab@...ux-iscsi.org>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/target/target_core_transport.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index 3931b50eeefd..65ecaa1c59a7 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -2328,6 +2328,10 @@ int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
 	list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
 out:
 	spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
+
+	if (ret && ack_kref)
+		target_put_sess_cmd(se_sess, se_cmd);
+
 	return ret;
 }
 EXPORT_SYMBOL(target_get_sess_cmd);
-- 
2.3.4

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