target: Fix se_cmd->state_list leak regression during WRITE failure

This patch addresses a v3.11 specific regression where se_cmd->state_list
was being leaked during a fabric WRITE failure, when the fabric releases
an associated se_cmd descriptor before I/O submission occurs, and normal
fast path callbacks have a chance to call target_remove_from_state_list().

It was manifesting with Poison overwritten messages with iscsi-target
once an ImmediateData payload CRC32C failure occured.

This bug was originally introduced during v3.11-rc1 with the following
commit:

commit 0b66818ac6de67a6125ae203272fb76e79b3a20f
Author: Nicholas Bellinger <nab@linux-iscsi.org>
Date:   Thu Jun 6 01:36:41 2013 -0700

    target: Drop unnecessary CMD_T_DEV_ACTIVE check from transport_lun_remove_cmd

Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

1 files changed, 11 insertions, 0 deletions

diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index 7172d005d063..d8e49d79f8cc 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -2134,6 +2134,7 @@ static void transport_write_pending_qf(struct se_cmd *cmd)
 
 int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
 {
+        unsigned long flags;
         int ret = 0;
 
         if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
@@ -2144,6 +2145,16 @@ int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
         } else {
                 if (wait_for_tasks)
                         transport_wait_for_tasks(cmd);
+                /*
+                 * Handle WRITE failure case where transport_generic_new_cmd()
+                 * has already added se_cmd to state_list, but fabric has
+                 * failed command before I/O submission.
+                 */
+                if (cmd->state_active) {
+                        spin_lock_irqsave(&cmd->t_state_lock, flags);
+                        target_remove_from_state_list(cmd);
+                        spin_unlock_irqrestore(&cmd->t_state_lock, flags);
+                }
 
                 if (cmd->se_lun)
                         transport_lun_remove_cmd(cmd);