commit 9c6260de505b63638dd86fcc33849b17f6146d94
author Aditya Pakki <pakki001@umn.edu> Mon Dec 24 12:24:45 2018 -0600
committer Jason Gunthorpe <jgg@mellanox.com> Wed Jan 02 16:08:38 2019 -0700
tree 4a3aeb7be3332b76b16ab1778a9eba8abc1527b6
parent 94edd87a1c59f3efa6fdf4e98d6d492e6cec6173

infiniband/qedr: Potential null ptr dereference of qp

idr_find() may fail and return a NULL pointer. The fix checks the return
value of the function and returns an error in case of NULL.

Signed-off-by: Aditya Pakki <pakki001@umn.edu>
Acked-by: Michal Kalderon <michal.kalderon@marvell.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/hw/qedr/qedr_iw_cm.c

diff --git a/drivers/infiniband/hw/qedr/qedr_iw_cm.c b/drivers/infiniband/hw/qedr/qedr_iw_cm.c
index 505fa36..93b16237 100644
--- a/drivers/infiniband/hw/qedr/qedr_iw_cm.c
+++ b/drivers/infiniband/hw/qedr/qedr_iw_cm.c
@@ -492,6 +492,8 @@
 	int i;
 
 	qp = idr_find(&dev->qpidr.idr, conn_param->qpn);
+	if (unlikely(!qp))
+		return -EINVAL;
 
 	laddr = (struct sockaddr_in *)&cm_id->m_local_addr;
 	raddr = (struct sockaddr_in *)&cm_id->m_remote_addr;