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Date: Mon, 28 Aug 2017 10:05:04 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Potnuri Bharat Teja <bharat@...lsio.com>, Matan Barak <matanb@...lanox.com>, Doug Ledford <dledford@...hat.com> Subject: [PATCH 4.12 66/99] RDMA/uverbs: Initialize cq_context appropriately 4.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Bharat Potnuri <bharat@...lsio.com> commit 65159c051c45f269cf40a14f9404248f2d524920 upstream. Initializing cq_context with ev_queue in create_cq(), leads to NULL pointer dereference in ib_uverbs_comp_handler(), if application doesnot use completion channel. This patch fixes the cq_context initialization. Fixes: 1e7710f3f65 ("IB/core: Change completion channel to use the reworked") Signed-off-by: Potnuri Bharat Teja <bharat@...lsio.com> Reviewed-by: Matan Barak <matanb@...lanox.com> Signed-off-by: Doug Ledford <dledford@...hat.com> (cherry picked from commit 699a2d5b1b880b4e4e1c7d55fa25659322cf5b51) Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- drivers/infiniband/core/uverbs_cmd.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/infiniband/core/uverbs_cmd.c +++ b/drivers/infiniband/core/uverbs_cmd.c @@ -1015,7 +1015,7 @@ static struct ib_ucq_object *create_cq(s 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; atomic_set(&cq->usecnt, 0); obj->uobject.object = cq;
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