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IB/mlx5: Fix NULL deference on mlx5_ib_update_xlt failure 

mlx5_ib_reg_user_mr called mlx5_ib_dereg_mr in case of MR population
failure. This resulted in a NULL dereference as ibmr->device wasn't
initialized yet.

We address this by adding an internal dereg_mr function that can handle
partially initialized MRs, and fixing clean_mr to work on partially
initialized MRs.

Fixes: ff740aefec ("IB/mlx5: Decouple MR allocation and population flows")
Signed-off-by: Ilya Lesokhin <ilyal@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Ilya Lesokhin 2017-09-24 21:46:35 +03:00 committed by Doug Ledford
parent d67bc5d4e3
commit fbcd49838d
1 changed files with 17 additions and 10 deletions
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27
drivers/infiniband/hw/mlx5/mr.c
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@ -47,7 +47,8 @@ enum {
#define MLX5_UMR_ALIGN 2048
static int clean_mr(struct mlx5_ib_mr *mr);
static int clean_mr(struct mlx5_ib_dev *dev, struct mlx5_ib_mr *mr);
static int dereg_mr(struct mlx5_ib_dev *dev, struct mlx5_ib_mr *mr);
static int mr_cache_max_order(struct mlx5_ib_dev *dev);
static int unreg_umr(struct mlx5_ib_dev *dev, struct mlx5_ib_mr *mr);
@ -1270,8 +1271,9 @@ struct ib_mr *mlx5_ib_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
err = mlx5_ib_update_xlt(mr, 0, ncont, page_shift,
update_xlt_flags);
if (err) {
mlx5_ib_dereg_mr(&mr->ibmr);
dereg_mr(dev, mr);
return ERR_PTR(err);
}
}
@ -1356,7 +1358,7 @@ int mlx5_ib_rereg_user_mr(struct ib_mr *ib_mr, int flags, u64 start,
err = mr_umem_get(pd, addr, len, access_flags, &mr->umem,
&npages, &page_shift, &ncont, &order);
if (err < 0) {
clean_mr(mr);
clean_mr(dev, mr);
return err;
}
}
@ -1410,7 +1412,7 @@ int mlx5_ib_rereg_user_mr(struct ib_mr *ib_mr, int flags, u64 start,
if (err) {
mlx5_ib_warn(dev, "Failed to rereg UMR\n");
ib_umem_release(mr->umem);
clean_mr(mr);
clean_mr(dev, mr);
return err;
}
}
@ -1469,9 +1471,8 @@ mlx5_free_priv_descs(struct mlx5_ib_mr *mr)
}
}
static int clean_mr(struct mlx5_ib_mr *mr)
static int clean_mr(struct mlx5_ib_dev *dev, struct mlx5_ib_mr *mr)
{
struct mlx5_ib_dev *dev = to_mdev(mr->ibmr.device);
int allocated_from_cache = mr->allocated_from_cache;
int err;
@ -1507,10 +1508,8 @@ static int clean_mr(struct mlx5_ib_mr *mr)
return 0;
}
int mlx5_ib_dereg_mr(struct ib_mr *ibmr)
static int dereg_mr(struct mlx5_ib_dev *dev, struct mlx5_ib_mr *mr)
{
struct mlx5_ib_dev *dev = to_mdev(ibmr->device);
struct mlx5_ib_mr *mr = to_mmr(ibmr);
int npages = mr->npages;
struct ib_umem *umem = mr->umem;
@ -1539,7 +1538,7 @@ int mlx5_ib_dereg_mr(struct ib_mr *ibmr)
}
#endif
clean_mr(mr);
clean_mr(dev, mr);
if (umem) {
ib_umem_release(umem);
@ -1549,6 +1548,14 @@ int mlx5_ib_dereg_mr(struct ib_mr *ibmr)
return 0;
}
int mlx5_ib_dereg_mr(struct ib_mr *ibmr)
{
struct mlx5_ib_dev *dev = to_mdev(ibmr->device);
struct mlx5_ib_mr *mr = to_mmr(ibmr);
return dereg_mr(dev, mr);
}
struct ib_mr *mlx5_ib_alloc_mr(struct ib_pd *pd,
enum ib_mr_type mr_type,
u32 max_num_sg)