RDMA/uverbs: Initialize cq_context appropriately

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@chelsio.com>
Reviewed-by: Matan Barak <matanb@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

diff --git a/drivers/infiniband/core/uverbs_cmd.c b/drivers/infiniband/core/uverbs_cmd.c
index 2c98533a0203b084fb198a3eb8088a0bac59522c..50a6c64f03889c8f0a8b788d5c6196942a0ec167 100644 (file)
--- 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(struct ib_uverbs_file *file,
        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;