diff mbox series

[rdma-next,06/15] RDMA/cm: Read id.state under lock when doing pr_debug()

Message ID 20200310092545.251365-7-leon@kernel.org (mailing list archive)
State Accepted
Delegated to: Jason Gunthorpe
Headers show
Series Fix locking around cm_id.state in the ib_cm | expand

Commit Message

Leon Romanovsky March 10, 2020, 9:25 a.m. UTC 
From: Jason Gunthorpe <jgg@mellanox.com>

The lock should not be dropped before doing the pr_debug() print as it is
accessing data protected by the lock, such as id.state.

Fixes: 119bf81793ea ("IB/cm: Add debug prints to ib_cm")
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
---
 drivers/infiniband/core/cm.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)
diff mbox series

Patch

diff --git a/drivers/infiniband/core/cm.c b/drivers/infiniband/core/cm.c
index 051a546b8e7b..f50b56302500 100644
--- a/drivers/infiniband/core/cm.c
+++ b/drivers/infiniband/core/cm.c
@@ -2421,13 +2421,13 @@  static int cm_rep_handler(struct cm_work *work)
 	case IB_CM_MRA_REQ_RCVD:
 		break;
 	default:
-		spin_unlock_irq(&cm_id_priv->lock);
 		ret = -EINVAL;
 		pr_debug(
 			"%s: cm_id_priv->id.state: %d, local_comm_id %d, remote_comm_id %d\n",
 			__func__, cm_id_priv->id.state,
 			IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg),
 			IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg));
+		spin_unlock_irq(&cm_id_priv->lock);
 		goto error;
 	}
 
@@ -2693,10 +2693,10 @@  int ib_send_cm_drep(struct ib_cm_id *cm_id,
 	cm_id_priv = container_of(cm_id, struct cm_id_private, id);
 	spin_lock_irqsave(&cm_id_priv->lock, flags);
 	if (cm_id->state != IB_CM_DREQ_RCVD) {
-		spin_unlock_irqrestore(&cm_id_priv->lock, flags);
-		kfree(data);
 		pr_debug("%s: local_id %d, cm_idcm_id->state(%d) != IB_CM_DREQ_RCVD\n",
 			 __func__, be32_to_cpu(cm_id->local_id), cm_id->state);
+		spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+		kfree(data);
 		return -EINVAL;
 	}
 
@@ -3032,10 +3032,10 @@  static int cm_rej_handler(struct cm_work *work)
 		}
 		/* fall through */
 	default:
-		spin_unlock_irq(&cm_id_priv->lock);
 		pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n",
 			 __func__, be32_to_cpu(cm_id_priv->id.local_id),
 			 cm_id_priv->id.state);
+		spin_unlock_irq(&cm_id_priv->lock);
 		ret = -EINVAL;
 		goto out;
 	}