From: Maor Gottlieb maorg@nvidia.com
[ Upstream commit 9b7d4be967f16f79a2283b2338709fcc750313ee ]
The cited commit removed from the cleanup flow of umr the checks if the resources were created. This could lead to null-ptr-deref in case that we had failure in mlx5_ib_stage_ib_reg_init stage.
Fix it by adding new state to the umr that can say if the resources were created or not and check it in the umr cleanup flow before destroying the resources.
Fixes: 04876c12c19e ("RDMA/mlx5: Move init and cleanup of UMR to umr.c") Reviewed-by: Michael Guralnik michaelgur@nvidia.com Signed-off-by: Maor Gottlieb maorg@nvidia.com Link: https://lore.kernel.org/r/4cfa61386cf202e9ce330e8d228ce3b25a36326e.166176345... Signed-off-by: Leon Romanovsky leon@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/infiniband/hw/mlx5/mlx5_ib.h | 1 + drivers/infiniband/hw/mlx5/umr.c | 3 +++ 2 files changed, 4 insertions(+)
diff --git a/drivers/infiniband/hw/mlx5/mlx5_ib.h b/drivers/infiniband/hw/mlx5/mlx5_ib.h index 7460e0dfe6db4..c2cca032a6ed4 100644 --- a/drivers/infiniband/hw/mlx5/mlx5_ib.h +++ b/drivers/infiniband/hw/mlx5/mlx5_ib.h @@ -718,6 +718,7 @@ struct mlx5_ib_umr_context { };
enum { + MLX5_UMR_STATE_UNINIT, MLX5_UMR_STATE_ACTIVE, MLX5_UMR_STATE_RECOVER, MLX5_UMR_STATE_ERR, diff --git a/drivers/infiniband/hw/mlx5/umr.c b/drivers/infiniband/hw/mlx5/umr.c index e00b94d1b1ea1..d5105b5c9979b 100644 --- a/drivers/infiniband/hw/mlx5/umr.c +++ b/drivers/infiniband/hw/mlx5/umr.c @@ -177,6 +177,7 @@ int mlx5r_umr_resource_init(struct mlx5_ib_dev *dev)
sema_init(&dev->umrc.sem, MAX_UMR_WR); mutex_init(&dev->umrc.lock); + dev->umrc.state = MLX5_UMR_STATE_ACTIVE;
return 0;
@@ -191,6 +192,8 @@ int mlx5r_umr_resource_init(struct mlx5_ib_dev *dev)
void mlx5r_umr_resource_cleanup(struct mlx5_ib_dev *dev) { + if (dev->umrc.state == MLX5_UMR_STATE_UNINIT) + return; ib_destroy_qp(dev->umrc.qp); ib_free_cq(dev->umrc.cq); ib_dealloc_pd(dev->umrc.pd);