linux-kernel - [PATCH] RDMA/qedr: fix potential use after free

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Message-Id: <1573021434-18768-1-git-send-email-bianpan2016@163.com>
Date:   Wed,  6 Nov 2019 14:23:54 +0800
From:   Pan Bian <bianpan2016@....com>
To:     Michal Kalderon <mkalderon@...vell.com>,
        Ariel Elior <aelior@...vell.com>,
        Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>
Cc:     linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
        Pan Bian <bianpan2016@....com>
Subject: [PATCH] RDMA/qedr: fix potential use after free

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

Signed-off-by: Pan Bian <bianpan2016@....com>
---
 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 22881d4442b9..eedc32b72ff2 100644
--- a/drivers/infiniband/hw/qedr/qedr_iw_cm.c
+++ b/drivers/infiniband/hw/qedr/qedr_iw_cm.c
@@ -451,10 +451,10 @@ 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;
 	}
-- 
2.7.4