linux-kernel - [ 049/108] tcm_fc: Fix fc_exch memory leak in ft_send_resp

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Message-Id: <20120330195729.135244025@linuxfoundation.org>
Date:	Fri, 30 Mar 2012 12:58:11 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Mark D Rustad <mark.d.rustad@...el.com>,
	Kiran Patil <kiran.patil@...el.com>,
	Robert Love <robert.w.love@...el.com>,
	Andy Grover <agrover@...hat.com>,
	Nicholas Bellinger <nab@...ux-iscsi.org>
Subject: [ 049/108] tcm_fc: Fix fc_exch memory leak in ft_send_resp_status

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

------------------

From: Nicholas Bellinger <nab@...ux-iscsi.org>

commit 031ed4d565b31880a4136bb7366bc89f5b1dba7d upstream.

This patch fixes a bug in tcm_fc where fc_exch memory from fc_exch_mgr->ep_pool
is currently being leaked by ft_send_resp_status() usage.  Following current
code in ft_queue_status() response path, using lport->tt.seq_send() needs to be
followed by a lport->tt.exch_done() in order to release fc_exch memory back into
libfc_em kmem_cache.

ft_send_resp_status() code is currently used in pre submit se_cmd ft_send_work()
error exceptions, TM request setup exceptions, and main TM response callback
path in ft_queue_tm_resp().  This bugfix addresses the leak in these cases.

Cc: Mark D Rustad <mark.d.rustad@...el.com>
Cc: Kiran Patil <kiran.patil@...el.com>
Cc: Robert Love <robert.w.love@...el.com>
Cc: Andy Grover <agrover@...hat.com>
Signed-off-by: Nicholas Bellinger <nab@...ux-iscsi.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/target/tcm_fc/tfc_cmd.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/target/tcm_fc/tfc_cmd.c
+++ b/drivers/target/tcm_fc/tfc_cmd.c
@@ -371,10 +371,12 @@ static void ft_send_resp_status(struct f
 
 	fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_DD_CMD_STATUS, 0);
 	sp = fr_seq(fp);
-	if (sp)
+	if (sp) {
 		lport->tt.seq_send(lport, sp, fp);
-	else
+		lport->tt.exch_done(sp);
+	} else {
 		lport->tt.frame_send(lport, fp);
+	}
 }
 
 /*


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