tcm_fc: Fix fc_exch memory leak in ft_send_resp_status

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@intel.com>
Cc: Kiran Patil <kiran.patil@intel.com>
Cc: Robert Love <robert.w.love@intel.com>
Cc: Andy Grover <agrover@redhat.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/target/tcm_fc/tfc_cmd.c b/drivers/target/tcm_fc/tfc_cmd.c
index 71fc9ce..754b669 100644 (file)
--- a/drivers/target/tcm_fc/tfc_cmd.c
+++ b/drivers/target/tcm_fc/tfc_cmd.c
@@ -329,10 +329,12 @@ static void ft_send_resp_status(struct fc_lport *lport,
 
        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);
+       }
 }
 
 /*