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authorNicholas Bellinger <nab@linux-iscsi.org>2013-08-31 15:12:01 -0700
committerNicholas Bellinger <nab@linux-iscsi.org>2013-08-31 15:19:12 -0700
commitc130480b129fbfd7932ad7af3f4ffcea630b027f (patch)
treec6dd2c8143d557204e55c2023b28cd021beeb4ef /drivers/target
parent28aaa950320fc7b8df3f6d2d34fa7833391a9b72 (diff)
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>
Diffstat (limited to 'drivers/target')
-rw-r--r--drivers/target/target_core_transport.c11
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);