[PATCH 4.10 23/75] IB/mlx5: Fix out-of-bound access
From: Greg Kroah-Hartman
Date: Mon Mar 13 2017 - 05:02:57 EST
4.10-stable review patch. If anyone has any objections, please let me know.
------------------
From: Leon Romanovsky <leonro@xxxxxxxxxxxx>
commit 0fd27a88c2e4f548937fd7d93fc6e65c4ad7c278 upstream.
When we initialize buffer to create SRQ in kernel,
the number of pages was less than actually used in
following mlx5_fill_page_array().
Fixes: e126ba97dba9 ("mlx5: Add driver for Mellanox Connect-IB adapters")
Signed-off-by: Leon Romanovsky <leonro@xxxxxxxxxxxx>
Reviewed-by: Eli Cohen <eli@xxxxxxxxxxxx>
Signed-off-by: Leon Romanovsky <leon@xxxxxxxxxx>
Signed-off-by: Doug Ledford <dledford@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/infiniband/hw/mlx5/srq.c | 11 +++--------
1 file changed, 3 insertions(+), 8 deletions(-)
--- a/drivers/infiniband/hw/mlx5/srq.c
+++ b/drivers/infiniband/hw/mlx5/srq.c
@@ -165,8 +165,6 @@ static int create_srq_kernel(struct mlx5
int err;
int i;
struct mlx5_wqe_srq_next_seg *next;
- int page_shift;
- int npages;
err = mlx5_db_alloc(dev->mdev, &srq->db);
if (err) {
@@ -179,7 +177,6 @@ static int create_srq_kernel(struct mlx5
err = -ENOMEM;
goto err_db;
}
- page_shift = srq->buf.page_shift;
srq->head = 0;
srq->tail = srq->msrq.max - 1;
@@ -191,10 +188,8 @@ static int create_srq_kernel(struct mlx5
cpu_to_be16((i + 1) & (srq->msrq.max - 1));
}
- npages = DIV_ROUND_UP(srq->buf.npages, 1 << (page_shift - PAGE_SHIFT));
- mlx5_ib_dbg(dev, "buf_size %d, page_shift %d, npages %d, calc npages %d\n",
- buf_size, page_shift, srq->buf.npages, npages);
- in->pas = mlx5_vzalloc(sizeof(*in->pas) * npages);
+ mlx5_ib_dbg(dev, "srq->buf.page_shift = %d\n", srq->buf.page_shift);
+ in->pas = mlx5_vzalloc(sizeof(*in->pas) * srq->buf.npages);
if (!in->pas) {
err = -ENOMEM;
goto err_buf;
@@ -208,7 +203,7 @@ static int create_srq_kernel(struct mlx5
}
srq->wq_sig = !!srq_signature;
- in->log_page_size = page_shift - MLX5_ADAPTER_PAGE_SHIFT;
+ in->log_page_size = srq->buf.page_shift - MLX5_ADAPTER_PAGE_SHIFT;
if (MLX5_CAP_GEN(dev->mdev, cqe_version) == MLX5_CQE_VERSION_V1 &&
in->type == IB_SRQT_XRC)
in->user_index = MLX5_IB_DEFAULT_UIDX;