[PATCH rdma-rc] RDMA/mlx5: Fix prefetch memory leak if get_prefetchable_mr fails

[Leon Romanovsky <leon@kernel.org>]

From: Jason Gunthorpe <jgg@nvidia.com>

destroy_prefetch_work() must always be called if the work is not going
to be queued. The num_sge also should have been set to i, not i-1
which avoids the condition where it shouldn't have been called in the
first place.

Cc: stable@vger.kernel.org
Fixes: fb985e278a30 ("RDMA/mlx5: Use SRCU properly in ODP prefetch")
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
---
 drivers/infiniband/hw/mlx5/odp.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/infiniband/hw/mlx5/odp.c b/drivers/infiniband/hw/mlx5/odp.c
index 4f1e46733830..cfd7efab114e 100644
--- a/drivers/infiniband/hw/mlx5/odp.c
+++ b/drivers/infiniband/hw/mlx5/odp.c
@@ -1806,9 +1806,7 @@ static bool init_prefetch_work(struct ib_pd *pd,
 		work->frags[i].mr =
 			get_prefetchable_mr(pd, advice, sg_list[i].lkey);
 		if (!work->frags[i].mr) {
-			work->num_sge = i - 1;
-			if (i)
-				destroy_prefetch_work(work);
+			work->num_sge = i;
 			return false;
 		}

@@ -1875,6 +1873,7 @@ int mlx5_ib_advise_mr_prefetch(struct ib_pd *pd,
 	srcu_key = srcu_read_lock(&dev->odp_srcu);
 	if (!init_prefetch_work(pd, advice, pf_flags, work, sg_list, num_sge)) {
 		srcu_read_unlock(&dev->odp_srcu, srcu_key);
+		destroy_prefetch_work(work);
 		return -EINVAL;
 	}
 	queue_work(system_unbound_wq, &work->work);
--
2.26.2