linux-kernel - [PATCH 3.12 081/127] IB/uverbs: Fix leak of XRC target QPs

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Message-Id: <81b33083ca84c12091a11abd6397b18f21207dc7.1480062521.git.jslaby@suse.cz>
Date:   Fri, 25 Nov 2016 09:29:54 +0100
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Tariq Toukan <tariqt@...lanox.com>,
        Noa Osherovich <noaos@...lanox.com>,
        Leon Romanovsky <leon@...nel.org>,
        Doug Ledford <dledford@...hat.com>, Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 081/127] IB/uverbs: Fix leak of XRC target QPs

From: Tariq Toukan <tariqt@...lanox.com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 5b810a242c28e1d8d64d718cebe75b79d86a0b2d upstream.

The real QP is destroyed in case of the ref count reaches zero, but
for XRC target QPs this call was missed and caused to QP leaks.

Let's call to destroy for all flows.

Fixes: 0e0ec7e0638e ('RDMA/core: Export ib_open_qp() to share XRC...')
Signed-off-by: Tariq Toukan <tariqt@...lanox.com>
Signed-off-by: Noa Osherovich <noaos@...lanox.com>
Signed-off-by: Leon Romanovsky <leon@...nel.org>
Signed-off-by: Doug Ledford <dledford@...hat.com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/infiniband/core/uverbs_main.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/infiniband/core/uverbs_main.c b/drivers/infiniband/core/uverbs_main.c
index ee5222168b68..2afdd52f29d1 100644
--- a/drivers/infiniband/core/uverbs_main.c
+++ b/drivers/infiniband/core/uverbs_main.c
@@ -237,12 +237,9 @@ static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file,
 			container_of(uobj, struct ib_uqp_object, uevent.uobject);
 
 		idr_remove_uobj(&ib_uverbs_qp_idr, uobj);
-		if (qp != qp->real_qp) {
-			ib_close_qp(qp);
-		} else {
+		if (qp == qp->real_qp)
 			ib_uverbs_detach_umcast(qp, uqp);
-			ib_destroy_qp(qp);
-		}
+		ib_destroy_qp(qp);
 		ib_uverbs_release_uevent(file, &uqp->uevent);
 		kfree(uqp);
 	}
-- 
2.10.2