diff options
| author | Nicholas Bellinger <nab@linux-iscsi.org> | 2013-08-31 15:12:01 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-09-14 07:06:45 -0700 |
| commit | a8f55b8e314fdc26deb92a1108ebfd413cae9dde (patch) | |
| tree | 87d34ff1c9fe44a6c6fc94e6641da4a2ef6ba0b8 | |
| parent | 96dba890600864c6753c1db27bc46e4aa6a01f68 (diff) | |
target: Fix se_cmd->state_list leak regression during WRITE failure
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@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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/target/target_core_transport.c | 11 |
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); |