[ 049/108] tcm_fc: Fix fc_exch memory leak in ft_send_resp_status

From: Greg KH
Date: Fri Mar 30 2012 - 18:56:15 EST

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


From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>

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@xxxxxxxxx>
Cc: Kiran Patil <kiran.patil@xxxxxxxxx>
Cc: Robert Love <robert.w.love@xxxxxxxxx>
Cc: Andy Grover <agrover@xxxxxxxxxx>
Signed-off-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

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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