4.14-stable review patch. If anyone has any objections, please let me know.
------------------
From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
commit ae072726f6109bb1c94841d6fb3a82dde298ea85 upstream.
Since commit 59b6986dbf fixed a potential NULL pointer dereference
by allocating a se_tmr_req for ISCSI_TM_FUNC_TASK_REASSIGN, the
se_tmr_req is currently leaked by iscsit_free_cmd() because no
iscsi_cmd->se_cmd.se_tfo was associated.
To address this, treat ISCSI_TM_FUNC_TASK_REASSIGN like any other
TMR and call transport_init_se_cmd() + target_get_sess_cmd() to
setup iscsi_cmd->se_cmd.se_tfo with se_cmd->cmd_kref of 2.
This will ensure normal release operation once se_cmd->cmd_kref
reaches zero and target_release_cmd_kref() is invoked, se_tmr_req
will be released via existing target_free_cmd_mem() and
core_tmr_release_req() code.
Reported-by: Donald White <dew@xxxxxxxxx>
Cc: Donald White <dew@xxxxxxxxx>
Cc: Mike Christie <mchristi@xxxxxxxxxx>
Cc: Hannes Reinecke <hare@xxxxxxxx>
Signed-off-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/target/iscsi/iscsi_target.c | 22 +++++++++-------------
1 file changed, 9 insertions(+), 13 deletions(-)
--- a/drivers/target/iscsi/iscsi_target.c
+++ b/drivers/target/iscsi/iscsi_target.c
@@ -1960,7 +1960,6 @@ iscsit_handle_task_mgt_cmd(struct iscsi_
struct iscsi_tmr_req *tmr_req;
struct iscsi_tm *hdr;
int out_of_order_cmdsn = 0, ret;
- bool sess_ref = false;
u8 function, tcm_function = TMR_UNKNOWN;
hdr = (struct iscsi_tm *) buf;
@@ -1993,22 +1992,23 @@ iscsit_handle_task_mgt_cmd(struct iscsi_
cmd->data_direction = DMA_NONE;
cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL);
- if (!cmd->tmr_req)
+ if (!cmd->tmr_req) {
return iscsit_add_reject_cmd(cmd,
ISCSI_REASON_BOOKMARK_NO_RESOURCES,
buf);
+ }
+
+ transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
+ conn->sess->se_sess, 0, DMA_NONE,
+ TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
+
+ target_get_sess_cmd(&cmd->se_cmd, true);
/*
* TASK_REASSIGN for ERL=2 / connection stays inside of
* LIO-Target $FABRIC_MOD
*/
if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
- transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
- conn->sess->se_sess, 0, DMA_NONE,
- TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
-
- target_get_sess_cmd(&cmd->se_cmd, true);
- sess_ref = true;
tcm_function = iscsit_convert_tmf(function);
if (tcm_function == TMR_UNKNOWN) {
pr_err("Unknown iSCSI TMR Function:"
@@ -2124,12 +2124,8 @@ attach:
* For connection recovery, this is also the default action for
* TMR TASK_REASSIGN.
*/
- if (sess_ref) {
- pr_debug("Handle TMR, using sess_ref=true check\n");
- target_put_sess_cmd(&cmd->se_cmd);
- }
-
iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
+ target_put_sess_cmd(&cmd->se_cmd);
return 0;
}
EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);