linux-kernel - [PATCH] [V2] infiniband: fix a missing check of nla

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Date:   Sat,  5 Jan 2019 10:18:07 -0600
From:   Aditya Pakki <pakki001@....edu>
To:     pakki001@....edu
Cc:     kjlu@....edu, Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Leon Romanovsky <leon@...nel.org>,
        Parav Pandit <parav@...lanox.com>,
        Daniel Jurgens <danielj@...lanox.com>,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] [V2] infiniband: fix a missing check of nla_put

nla_put() may fail. The fix adds a check for its return value, and
returns -EMSGSIZE if it fails, post canceling netlink msg.

Signed-off-by: Aditya Pakki <pakki001@....edu>
---
 drivers/infiniband/core/addr.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/infiniband/core/addr.c b/drivers/infiniband/core/addr.c
index 0dce94e3c495..e847b34bacd1 100644
--- a/drivers/infiniband/core/addr.c
+++ b/drivers/infiniband/core/addr.c
@@ -178,7 +178,10 @@ static int ib_nl_ip_send_msg(struct rdma_dev_addr *dev_addr,
 	/* Construct the family header first */
 	header = skb_put(skb, NLMSG_ALIGN(sizeof(*header)));
 	header->ifindex = dev_addr->bound_dev_if;
-	nla_put(skb, attrtype, size, daddr);
+	if (nla_put(skb, attrtype, size, daddr)) {
+		nlmsg_cancel(skb, nlh);
+		return -EMSGSIZE;
+	}
 
 	/* Repair the nlmsg header length */
 	nlmsg_end(skb, nlh);
-- 
2.17.1