4.14-stable review patch. If anyone has any objections, please let me know.
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From: Michael J. Ruhl michael.j.ruhl@intel.com
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@vger.kernel.org # 4.14.x Fixes: 9ee79fce3642 ("IB/core: Add completion queue (cq) object actions") Reviewed-by: Dennis Dalessandro dennis.dalessandro@intel.com Reviewed-by: Ira Weiny ira.weiny@intel.com Signed-off-by: Michael J. Ruhl michael.j.ruhl@intel.com Signed-off-by: Dennis Dalessandro dennis.dalessandro@intel.com Signed-off-by: Jason Gunthorpe jgg@mellanox.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- 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);