linux-kernel - [PATCH 4.19 032/245] RDMA/qedr: Fix potential use after free

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Message-Id: <20200929105948.569675105@linuxfoundation.org>
Date:   Tue, 29 Sep 2020 12:58:03 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Pan Bian <bianpan2016@....com>,
        Michal Kalderon  <michal.kalderon@...vell.com>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 032/245] RDMA/qedr: Fix potential use after free

From: Pan Bian <bianpan2016@....com>

[ Upstream commit 960657b732e1ce21b07be5ab48a7ad3913d72ba4 ]

Move the release operation after error log to avoid possible use after
free.

Link: https://lore.kernel.org/r/1573021434-18768-1-git-send-email-bianpan2016@163.com
Signed-off-by: Pan Bian <bianpan2016@....com>
Acked-by: Michal Kalderon <michal.kalderon@...vell.com>
Reviewed-by: Jason Gunthorpe <jgg@...lanox.com>
Signed-off-by: Jason Gunthorpe <jgg@...lanox.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/infiniband/hw/qedr/qedr_iw_cm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/infiniband/hw/qedr/qedr_iw_cm.c b/drivers/infiniband/hw/qedr/qedr_iw_cm.c
index 2566715773675..e908dfbaa1378 100644
--- a/drivers/infiniband/hw/qedr/qedr_iw_cm.c
+++ b/drivers/infiniband/hw/qedr/qedr_iw_cm.c
@@ -460,10 +460,10 @@ qedr_addr6_resolve(struct qedr_dev *dev,
 
 	if ((!dst) || dst->error) {
 		if (dst) {
-			dst_release(dst);
 			DP_ERR(dev,
 			       "ip6_route_output returned dst->error = %d\n",
 			       dst->error);
+			dst_release(dst);
 		}
 		return -EINVAL;
 	}
-- 
2.25.1