linux-kernel - [PATCH 5.15 055/110] IB/cm: Release previously acquired reference counter in the cm_id

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Date:   Mon,  7 Feb 2022 12:06:28 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
        Mark Zhang <markzhang@...dia.com>,
        Leon Romanovsky <leonro@...dia.com>,
        Jason Gunthorpe <jgg@...dia.com>
Subject: [PATCH 5.15 055/110] IB/cm: Release previously acquired reference counter in the cm_id_priv

From: Mark Zhang <markzhang@...dia.com>

commit b856101a1774b5f1c8c99e8dfdef802856520732 upstream.

In failure flow, the reference counter acquired was not released,
and the following error was reported:

  drivers/infiniband/core/cm.c:3373 cm_lap_handler() warn: inconsistent
			refcounting 'cm_id_priv->refcount.refs.counter':

Fixes: 7345201c3963 ("IB/cm: Improve the calling of cm_init_av_for_lap and cm_init_av_by_path")
Link: https://lore.kernel.org/r/7615f23bbb5c5b66d03f6fa13e1c99d51dae6916.1642581448.git.leonro@nvidia.com
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Mark Zhang <markzhang@...dia.com>
Signed-off-by: Leon Romanovsky <leonro@...dia.com>
Signed-off-by: Jason Gunthorpe <jgg@...dia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/infiniband/core/cm.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/infiniband/core/cm.c
+++ b/drivers/infiniband/core/cm.c
@@ -3322,7 +3322,7 @@ static int cm_lap_handler(struct cm_work
 	ret = cm_init_av_by_path(param->alternate_path, NULL, &alt_av);
 	if (ret) {
 		rdma_destroy_ah_attr(&ah_attr);
-		return -EINVAL;
+		goto deref;
 	}
 
 	spin_lock_irq(&cm_id_priv->lock);