linux-kernel - [PATCH -next] RDMA/core: Properly return the error code of rdma_set_src_addr

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Date:   Wed, 19 Sep 2018 20:28:38 +0800
From:   YueHaibing <yuehaibing@...wei.com>
To:     <dledford@...hat.com>, <jgg@...pe.ca>, <leon@...nel.org>,
        <parav@...lanox.com>, <danielj@...lanox.com>
CC:     <linux-kernel@...r.kernel.org>, <linux-rdma@...r.kernel.org>,
        YueHaibing <yuehaibing@...wei.com>
Subject: [PATCH -next] RDMA/core: Properly return the error code of rdma_set_src_addr_rcu

rdma_set_src_addr_rcu should check copy_src_l2_addr fails,
rather than always return 0. Also copy_src_l2_addr should return
'ret' as its return value while rdma_translate_ip fails.

Fixes: c31d4b2ddf07 ("RDMA/core: Protect against changing dst->dev during destination resolve")
Signed-off-by: YueHaibing <yuehaibing@...wei.com>
---
 drivers/infiniband/core/addr.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/infiniband/core/addr.c b/drivers/infiniband/core/addr.c
index 7a0356c..8a31b11 100644
--- a/drivers/infiniband/core/addr.c
+++ b/drivers/infiniband/core/addr.c
@@ -468,7 +468,7 @@ static int addr_resolve_neigh(const struct dst_entry *dst,
 	return ret;
 }
 
-static void copy_src_l2_addr(struct rdma_dev_addr *dev_addr,
+static int copy_src_l2_addr(struct rdma_dev_addr *dev_addr,
 			     const struct sockaddr *dst_in,
 			     const struct dst_entry *dst,
 			     const struct net_device *ndev)
@@ -492,6 +492,8 @@ static void copy_src_l2_addr(struct rdma_dev_addr *dev_addr,
 						RDMA_NETWORK_IPV6;
 	else
 		dev_addr->network = RDMA_NETWORK_IB;
+
+	return ret;
 }
 
 static int rdma_set_src_addr_rcu(struct rdma_dev_addr *dev_addr,
@@ -499,6 +501,7 @@ static int rdma_set_src_addr_rcu(struct rdma_dev_addr *dev_addr,
 				 const struct sockaddr *dst_in,
 				 const struct dst_entry *dst)
 {
+	int ret;
 	struct net_device *ndev = READ_ONCE(dst->dev);
 
 	*ndev_flags = ndev->flags;
@@ -515,8 +518,8 @@ static int rdma_set_src_addr_rcu(struct rdma_dev_addr *dev_addr,
 			return -ENODEV;
 	}
 
-	copy_src_l2_addr(dev_addr, dst_in, dst, ndev);
-	return 0;
+	ret = copy_src_l2_addr(dev_addr, dst_in, dst, ndev);
+	return ret;
 }
 
 static int set_addr_netns_by_gid_rcu(struct rdma_dev_addr *addr)
-- 
2.7.0