[PATCH] RDMA/irdma: Check for null udata during reg_user_mr

[PATCH] RDMA/irdma: Check for null udata during reg_user_mr

[Jacob Moroni]

The irdma driver requires udata for reg_user_mr. Previously,
it was assuming that it was always non-null, but it can actually
be null if the user intentionally triggers the UVERBS_METHOD_REG_MR
ioctl.

Signed-off-by: Jacob Moroni <jmoroni@google.com>
---
 drivers/infiniband/hw/irdma/verbs.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/infiniband/hw/irdma/verbs.c b/drivers/infiniband/hw/irdma/verbs.c
index cb54c7c8fcd..3bcac68a612 100644
--- a/drivers/infiniband/hw/irdma/verbs.c
+++ b/drivers/infiniband/hw/irdma/verbs.c
@@ -3519,6 +3519,9 @@ static struct ib_mr *irdma_reg_user_mr(struct ib_pd *pd, u64 start, u64 len,
 	if (dmah)
 		return ERR_PTR(-EOPNOTSUPP);
 
+	if (!udata)
+		return ERR_PTR(-EINVAL);
+
 	if (len > iwdev->rf->sc_dev.hw_attrs.max_mr_size)
 		return ERR_PTR(-EINVAL);
 
-- 
2.55.0.rc0.799.gd6f94ed593-goog