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iscsi-target: Fix ISCSI_OP_SCSI_TMFUNC handling for iser
This patch adds target_get_sess_cmd reference counting for iscsit_handle_task_mgt_cmd(), and adds a target_put_sess_cmd() for the failure case. It also fixes a bug where ISCSI_OP_SCSI_TMFUNC type commands where leaking iscsi_cmd->i_conn_node and eventually triggering an OOPs during struct isert_conn shutdown. Cc: stable@vger.kernel.org # 3.10+ Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
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561bf15892
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186a964701
2 changed files with 18 additions and 10 deletions
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@ -1200,14 +1200,12 @@ isert_put_cmd(struct isert_cmd *isert_cmd)
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{
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struct iscsi_cmd *cmd = &isert_cmd->iscsi_cmd;
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struct isert_conn *isert_conn = isert_cmd->conn;
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struct iscsi_conn *conn;
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struct iscsi_conn *conn = isert_conn->conn;
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pr_debug("Entering isert_put_cmd: %p\n", isert_cmd);
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switch (cmd->iscsi_opcode) {
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case ISCSI_OP_SCSI_CMD:
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conn = isert_conn->conn;
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spin_lock_bh(&conn->cmd_lock);
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if (!list_empty(&cmd->i_conn_node))
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list_del(&cmd->i_conn_node);
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@ -1217,16 +1215,18 @@ isert_put_cmd(struct isert_cmd *isert_cmd)
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iscsit_stop_dataout_timer(cmd);
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isert_unmap_cmd(isert_cmd, isert_conn);
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/*
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* Fall-through
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*/
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transport_generic_free_cmd(&cmd->se_cmd, 0);
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break;
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case ISCSI_OP_SCSI_TMFUNC:
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spin_lock_bh(&conn->cmd_lock);
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if (!list_empty(&cmd->i_conn_node))
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list_del(&cmd->i_conn_node);
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spin_unlock_bh(&conn->cmd_lock);
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transport_generic_free_cmd(&cmd->se_cmd, 0);
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break;
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case ISCSI_OP_REJECT:
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case ISCSI_OP_NOOP_OUT:
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conn = isert_conn->conn;
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spin_lock_bh(&conn->cmd_lock);
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if (!list_empty(&cmd->i_conn_node))
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list_del(&cmd->i_conn_node);
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@ -1737,8 +1737,8 @@ iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
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struct se_tmr_req *se_tmr;
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struct iscsi_tmr_req *tmr_req;
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struct iscsi_tm *hdr;
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int out_of_order_cmdsn = 0;
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int ret;
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int out_of_order_cmdsn = 0, ret;
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bool sess_ref = false;
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u8 function;
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hdr = (struct iscsi_tm *) buf;
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@ -1794,6 +1794,9 @@ iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
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conn->sess->se_sess, 0, DMA_NONE,
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MSG_SIMPLE_TAG, cmd->sense_buffer + 2);
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target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
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sess_ref = true;
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switch (function) {
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case ISCSI_TM_FUNC_ABORT_TASK:
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tcm_function = TMR_ABORT_TASK;
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@ -1931,6 +1934,11 @@ iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
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* For connection recovery, this is also the default action for
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* TMR TASK_REASSIGN.
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*/
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if (sess_ref) {
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pr_debug("Handle TMR, using sess_ref=true check\n");
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target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
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}
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iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
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return 0;
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}
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