This is a note to let you know that I've just added the patch titled

IB/core: Avoid a potential OOPs for an unused optional parameter

to the 4.15-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: ib-core-avoid-a-potential-oops-for-an-unused-optional-parameter.patch and it can be found in the queue-4.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From 2ff124d597c2df8696169ce0006fc974c49a4569 Mon Sep 17 00:00:00 2001

From: "Michael J. Ruhl" michael.j.ruhl@intel.com Date: Thu, 1 Feb 2018 12:31:06 -0800 Subject: IB/core: Avoid a potential OOPs for an unused optional parameter

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);

Patches currently in stable-queue which might be from michael.j.ruhl@intel.com are

queue-4.15/ib-core-avoid-a-potential-oops-for-an-unused-optional-parameter.patch queue-4.15/ib-qib-fix-comparison-error-with-qperf-compare-swap-test.patch