linux-kernel - [PATCH] infiniband: cxgb4: fix a potential NULL pointer dereference

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Message-Id: <20190309051921.15212-1-kjlu@umn.edu>
Date:   Fri,  8 Mar 2019 23:19:21 -0600
From:   Kangjie Lu <kjlu@....edu>
To:     kjlu@....edu
Cc:     pakki001@....edu, Steve Wise <swise@...lsio.com>,
        Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] infiniband: cxgb4: fix a potential NULL pointer dereference

get_skb may fail and return NULL. The fix returns "ENOMEM"
when it fails to avoid NULL dereference.

Signed-off-by: Kangjie Lu <kjlu@....edu>
---
 drivers/infiniband/hw/cxgb4/cm.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/infiniband/hw/cxgb4/cm.c b/drivers/infiniband/hw/cxgb4/cm.c
index 8221813219e5..502a54d57e2c 100644
--- a/drivers/infiniband/hw/cxgb4/cm.c
+++ b/drivers/infiniband/hw/cxgb4/cm.c
@@ -1919,6 +1919,9 @@ static int send_fw_act_open_req(struct c4iw_ep *ep, unsigned int atid)
 	int win;
 
 	skb = get_skb(NULL, sizeof(*req), GFP_KERNEL);
+	if (!skb)
+		return -ENOMEM;
+
 	req = __skb_put_zero(skb, sizeof(*req));
 	req->op_compl = htonl(WR_OP_V(FW_OFLD_CONNECTION_WR));
 	req->len16_pkd = htonl(FW_WR_LEN16_V(DIV_ROUND_UP(sizeof(*req), 16)));
-- 
2.17.1