4.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Michael J. Ruhl <michael.j.ruhl@xxxxxxxxx> commit 2ff124d597c2df8696169ce0006fc974c49a4569 upstream. The ev_file is an optional parameter for CQ creation. If the parameter is not passed, the ev_file pointer will be NULL. Using that pointer to set the cq_context will result in an OOPs. Verify that ev_file is not NULL before using. Cc: <stable@xxxxxxxxxxxxxxx> # 4.14.x Fixes: 9ee79fce3642 ("IB/core: Add completion queue (cq) object actions") Reviewed-by: Dennis Dalessandro <dennis.dalessandro@xxxxxxxxx> Reviewed-by: Ira Weiny <ira.weiny@xxxxxxxxx> Signed-off-by: Michael J. Ruhl <michael.j.ruhl@xxxxxxxxx> Signed-off-by: Dennis Dalessandro <dennis.dalessandro@xxxxxxxxx> Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/infiniband/core/uverbs_std_types.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/infiniband/core/uverbs_std_types.c +++ b/drivers/infiniband/core/uverbs_std_types.c @@ -315,7 +315,7 @@ static int uverbs_create_cq_handler(stru cq->uobject = &obj->uobject; cq->comp_handler = ib_uverbs_comp_handler; cq->event_handler = ib_uverbs_cq_event_handler; - cq->cq_context = &ev_file->ev_queue; + cq->cq_context = ev_file ? &ev_file->ev_queue : NULL; obj->uobject.object = cq; obj->uobject.user_handle = user_handle; atomic_set(&cq->usecnt, 0);