From: Leon Romanovsky <leon@kernel.org>
Date: Sun, 29 Oct 2017 21:34:35 +0200
Subject: RDMA/cxgb4: Protect from possible dereference
Patch-mainline: v4.15-rc1
Git-commit: 9950acf945f55222385d85489617e1d81e45fe34
References: bsc#1064802 bsc#1066129

Smatch tool reports the following error:
  drivers/infiniband/hw/cxgb4/qp.c:1886
	c4iw_create_qp() error: we previously assumed 'ucontext'
	could be null (see line 1804)

Cc: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Reviewed-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/infiniband/hw/cxgb4/qp.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/infiniband/hw/cxgb4/qp.c
+++ b/drivers/infiniband/hw/cxgb4/qp.c
@@ -1843,7 +1843,7 @@ struct ib_qp *c4iw_create_qp(struct ib_p
 	if (ret)
 		goto err_destroy_qp;
 
-	if (udata) {
+	if (udata && ucontext) {
 		sq_key_mm = kmalloc(sizeof(*sq_key_mm), GFP_KERNEL);
 		if (!sq_key_mm) {
 			ret = -ENOMEM;