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

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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: <[email protected]> # 4.14.x
Fixes: 9ee79fce36 ("IB/core: Add completion queue (cq) object actions")
Reviewed-by: Dennis Dalessandro <[email protected]>
Reviewed-by: Ira Weiny <[email protected]>
Signed-off-by: Michael J. Ruhl <[email protected]>
Signed-off-by: Dennis Dalessandro <[email protected]>
Signed-off-by: Jason Gunthorpe <[email protected]>
This commit is contained in:
Michael J. Ruhl 2018-02-01 12:31:06 -08:00 • committed by Jason Gunthorpe
commit 2ff124d597
1 changed files with 1 additions and 1 deletions
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2
drivers/infiniband/core/uverbs_std_types.c
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@ -316,7 +316,7 @@ static int uverbs_create_cq_handler(struct ib_device *ib_dev,
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);