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RDMA/verbs: Check existence of function prior to accessing it 

Update all the flows to ensure that function pointer exists prior
to accessing it.

This is much safer than checking the uverbs_ex_mask variable, especially
since we know that test isn't working properly and will be removed
in -next.

This prevents a user triggereable oops.

Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Leon Romanovsky 2018-02-14 14:38:43 +02:00 committed by Jason Gunthorpe
parent 1f5a6c47aa
commit 2188558621
2 changed files with 24 additions and 0 deletions
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3
drivers/infiniband/core/core_priv.h
View File

@ -309,6 +309,9 @@ static inline struct ib_qp *_ib_create_qp(struct ib_device *dev,
{
struct ib_qp *qp;
if (!dev->create_qp)
return ERR_PTR(-EOPNOTSUPP);
qp = dev->create_qp(pd, attr, udata);
if (IS_ERR(qp))
return qp;

21
drivers/infiniband/core/uverbs_cmd.c
View File

@ -978,6 +978,9 @@ static struct ib_ucq_object *create_cq(struct ib_uverbs_file *file,
struct ib_uverbs_ex_create_cq_resp resp;
struct ib_cq_init_attr attr = {};
if (!ib_dev->create_cq)
return ERR_PTR(-EOPNOTSUPP);
if (cmd->comp_vector >= file->device->num_comp_vectors)
return ERR_PTR(-EINVAL);
@ -2947,6 +2950,11 @@ int ib_uverbs_ex_create_wq(struct ib_uverbs_file *file,
wq_init_attr.create_flags = cmd.create_flags;
obj->uevent.events_reported = 0;
INIT_LIST_HEAD(&obj->uevent.event_list);
if (!pd->device->create_wq) {
err = -EOPNOTSUPP;
goto err_put_cq;
}
wq = pd->device->create_wq(pd, &wq_init_attr, uhw);
if (IS_ERR(wq)) {
err = PTR_ERR(wq);
@ -3090,7 +3098,12 @@ int ib_uverbs_ex_modify_wq(struct ib_uverbs_file *file,
wq_attr.flags = cmd.flags;
wq_attr.flags_mask = cmd.flags_mask;
}
if (!wq->device->modify_wq) {
ret = -EOPNOTSUPP;
goto out;
}
ret = wq->device->modify_wq(wq, &wq_attr, cmd.attr_mask, uhw);
out:
uobj_put_obj_read(wq);
return ret;
}
@ -3187,6 +3200,11 @@ int ib_uverbs_ex_create_rwq_ind_table(struct ib_uverbs_file *file,
init_attr.log_ind_tbl_size = cmd.log_ind_tbl_size;
init_attr.ind_tbl = wqs;
if (!ib_dev->create_rwq_ind_table) {
err = -EOPNOTSUPP;
goto err_uobj;
}
rwq_ind_tbl = ib_dev->create_rwq_ind_table(ib_dev, &init_attr, uhw);
if (IS_ERR(rwq_ind_tbl)) {
@ -3776,6 +3794,9 @@ int ib_uverbs_ex_query_device(struct ib_uverbs_file *file,
struct ib_device_attr attr = {0};
int err;
if (!ib_dev->query_device)
return -EOPNOTSUPP;
if (ucore->inlen < sizeof(cmd))
return -EINVAL;