This is a note to let you know that I've just added the patch titled
target: Fix se_cmd->state_list leak regression during WRITE failure
to the 3.11-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
target-fix-se_cmd-state_list-leak-regression-during-write-failure.patch
and it can be found in the queue-3.11 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From c130480b129fbfd7932ad7af3f4ffcea630b027f Mon Sep 17 00:00:00 2001
From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
Date: Sat, 31 Aug 2013 15:12:01 -0700
Subject: target: Fix se_cmd->state_list leak regression during WRITE failure
From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
commit c130480b129fbfd7932ad7af3f4ffcea630b027f upstream.
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@xxxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/target/target_core_transport.c | 11 +++++++++++
1 file changed, 11 insertions(+)
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -2134,6 +2134,7 @@ static void transport_write_pending_qf(s
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
} 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);
Patches currently in stable-queue which might be from nab@xxxxxxxxxxxxxxx are
queue-3.11/target-fix-trailing-ascii-space-usage-in-inquiry-vendor-model.patch
queue-3.11/iscsi-target-fix-iscsit_transport-reference-leak-during-np-thread-reset.patch
queue-3.11/target-fix-se_cmd-state_list-leak-regression-during-write-failure.patch
queue-3.11/iscsi-target-fix-immediatedata-yes-failure-regression-in-v3.10.patch
queue-3.11/iscsi-target-fix-potential-null-pointer-in-solicited-nopout-reject.patch
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