[PATCH 3.11 112/198] iscsi-target: Fix ABORT_TASK + connection reset iscsi_queue_req memory leak

From: Luis Henriques
Date: Thu Jul 03 2014 - 05:52:34 EST


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

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

From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>

commit bbc050488525e1ab1194c27355f63c66814385b8 upstream.

This patch fixes a iscsi_queue_req memory leak when ABORT_TASK response
has been queued by TFO->queue_tm_rsp() -> lio_queue_tm_rsp() after a
long standing I/O completes, but the connection has already reset and
waiting for cleanup to complete in iscsit_release_commands_from_conn()
-> transport_generic_free_cmd() -> transport_wait_for_tasks() code.

It moves iscsit_free_queue_reqs_for_conn() after the per-connection command
list has been released, so that the associated se_cmd tag can be completed +
released by target-core before freeing any remaining iscsi_queue_req memory
for the connection generated by lio_queue_tm_rsp().

Cc: Thomas Glanzmann <thomas@xxxxxxxxxxxx>
Cc: Charalampos Pournaris <charpour@xxxxxxxxx>
Signed-off-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
Signed-off-by: Luis Henriques <luis.henriques@xxxxxxxxxxxxx>
---
drivers/target/iscsi/iscsi_target.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c
index 2681183abca6..a2a650733df2 100644
--- a/drivers/target/iscsi/iscsi_target.c
+++ b/drivers/target/iscsi/iscsi_target.c
@@ -4217,8 +4217,6 @@ int iscsit_close_connection(
if (conn->conn_transport->iscsit_wait_conn)
conn->conn_transport->iscsit_wait_conn(conn);

- iscsit_free_queue_reqs_for_conn(conn);
-
/*
* During Connection recovery drop unacknowledged out of order
* commands for this connection, and prepare the other commands
@@ -4235,6 +4233,7 @@ int iscsit_close_connection(
iscsit_clear_ooo_cmdsns_for_conn(conn);
iscsit_release_commands_from_conn(conn);
}
+ iscsit_free_queue_reqs_for_conn(conn);

/*
* Handle decrementing session or connection usage count if
--
1.9.1

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