[PATCH v2] RDMA/nldev: Fix NULL pointer dereferences issue in rdma_nl_notify_event

[Qianqiang Liu]

nlmsg_put() may return a NULL pointer assigned to nlh, which will later
be dereferenced in nlmsg_end().

Fixes: 9cbed5aab5ae ("RDMA/nldev: Add support for RDMA monitoring")
Signed-off-by: Qianqiang Liu <qianqiang.liu@xxxxxxx>
---
 Changes since v1:
 - Add Fixes tag
---
 drivers/infiniband/core/nldev.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/infiniband/core/nldev.c b/drivers/infiniband/core/nldev.c
index 39f89a4b86498..7dc8e2ec62cc8 100644
--- a/drivers/infiniband/core/nldev.c
+++ b/drivers/infiniband/core/nldev.c
@@ -2816,6 +2816,8 @@ int rdma_nl_notify_event(struct ib_device *device, u32 port_num,
 	nlh = nlmsg_put(skb, 0, 0,
 			RDMA_NL_GET_TYPE(RDMA_NL_NLDEV, RDMA_NLDEV_CMD_MONITOR),
 			0, 0);
+	if (!nlh)
+		goto err_free;
 
 	switch (type) {
 	case RDMA_REGISTER_EVENT:
-- 
2.39.5