This is a note to let you know that I've just added the patch titled scsi: qedi: Fix list_del corruption while removing active I/O to the 5.8-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: scsi-qedi-fix-list_del-corruption-while-removing-act.patch and it can be found in the queue-5.8 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 09a27ec72846612da776db5f09b21d7f4a5cd496 Author: Nilesh Javali <njavali@xxxxxxxxxxx> Date: Tue Sep 8 02:56:52 2020 -0700 scsi: qedi: Fix list_del corruption while removing active I/O [ Upstream commit 28b35d17f9f8573d4646dd8df08917a4076a6b63 ] While aborting the I/O, the firmware cleanup task timed out and driver deleted the I/O from active command list. Some time later the firmware sent the cleanup task response and driver again deleted the I/O from active command list causing firmware to send completion for non-existent I/O and list_del corruption of active command list. Add fix to check if I/O is present before deleting it from the active command list to ensure firmware sends valid I/O completion and protect against list_del corruption. Link: https://lore.kernel.org/r/20200908095657.26821-4-mrangankar@xxxxxxxxxxx Signed-off-by: Nilesh Javali <njavali@xxxxxxxxxxx> Signed-off-by: Manish Rangankar <mrangankar@xxxxxxxxxxx> Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/scsi/qedi/qedi_fw.c b/drivers/scsi/qedi/qedi_fw.c index 32586800620bd..90aa64604ad78 100644 --- a/drivers/scsi/qedi/qedi_fw.c +++ b/drivers/scsi/qedi/qedi_fw.c @@ -825,8 +825,11 @@ static void qedi_process_cmd_cleanup_resp(struct qedi_ctx *qedi, qedi_clear_task_idx(qedi_conn->qedi, rtid); spin_lock(&qedi_conn->list_lock); - list_del_init(&dbg_cmd->io_cmd); - qedi_conn->active_cmd_count--; + if (likely(dbg_cmd->io_cmd_in_list)) { + dbg_cmd->io_cmd_in_list = false; + list_del_init(&dbg_cmd->io_cmd); + qedi_conn->active_cmd_count--; + } spin_unlock(&qedi_conn->list_lock); qedi_cmd->state = CLEANUP_RECV; wake_up_interruptible(&qedi_conn->wait_queue); @@ -1244,6 +1247,7 @@ int qedi_cleanup_all_io(struct qedi_ctx *qedi, struct qedi_conn *qedi_conn, qedi_conn->cmd_cleanup_req++; qedi_iscsi_cleanup_task(ctask, true); + cmd->io_cmd_in_list = false; list_del_init(&cmd->io_cmd); qedi_conn->active_cmd_count--; QEDI_WARN(&qedi->dbg_ctx, @@ -1455,8 +1459,11 @@ static void qedi_tmf_work(struct work_struct *work) spin_unlock_bh(&qedi_conn->tmf_work_lock); spin_lock(&qedi_conn->list_lock); - list_del_init(&cmd->io_cmd); - qedi_conn->active_cmd_count--; + if (likely(cmd->io_cmd_in_list)) { + cmd->io_cmd_in_list = false; + list_del_init(&cmd->io_cmd); + qedi_conn->active_cmd_count--; + } spin_unlock(&qedi_conn->list_lock); clear_bit(QEDI_CONN_FW_CLEANUP, &qedi_conn->flags);