net/mlx5: Fix use after free in mlx5_health_wait_pci_up

The device health recovery flow calls mlx5_health_wait_pci_up() which
queries the device for FW_RESET timeout after freeing the device
timeouts structure on mlx5_function_teardown(). Fix this bug by moving
timeouts structure init/cleanup to the device's init/uninit phases.
Since it is necessary to reset default software timeouts on function
reload, extract setting of defaults values from mlx5_tout_init() and
call mlx5_tout_set_def_val() directly from mlx5_function_setup().

Fixes: 5945e1adeab5 ("net/mlx5: Read timeout values from init segment")
Reported by: Niklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: Amir Tzin <amirtz@nvidia.com>
Signed-off-by: Moshe Shemesh <moshe@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/tout.c b/drivers/net/ethernet/mellanox/mlx5/core/lib/tout.c
index 0dd96a6..c1df0d3 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/lib/tout.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/tout.c
@@ -31,11 +31,11 @@ static void tout_set(struct mlx5_core_dev *dev, u64 val, enum mlx5_timeouts_type
        dev->timeouts->to[type] = val;
 }
 
-static void tout_set_def_val(struct mlx5_core_dev *dev)
+void mlx5_tout_set_def_val(struct mlx5_core_dev *dev)
 {
        int i;
 
-       for (i = MLX5_TO_FW_PRE_INIT_TIMEOUT_MS; i < MAX_TIMEOUT_TYPES; i++)
+       for (i = 0; i < MAX_TIMEOUT_TYPES; i++)
                tout_set(dev, tout_def_sw_val[i], i);
 }
 
@@ -45,7 +45,6 @@ int mlx5_tout_init(struct mlx5_core_dev *dev)
        if (!dev->timeouts)
                return -ENOMEM;
 
-       tout_set_def_val(dev);
        return 0;
 }
 

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/tout.h b/drivers/net/ethernet/mellanox/mlx5/core/lib/tout.h
index 31faa5c..1c42ead 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/lib/tout.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/tout.h
@@ -34,6 +34,7 @@ int mlx5_tout_init(struct mlx5_core_dev *dev);
 void mlx5_tout_cleanup(struct mlx5_core_dev *dev);
 void mlx5_tout_query_iseg(struct mlx5_core_dev *dev);
 int mlx5_tout_query_dtor(struct mlx5_core_dev *dev);
+void mlx5_tout_set_def_val(struct mlx5_core_dev *dev);
 u64 _mlx5_tout_ms(struct mlx5_core_dev *dev, enum mlx5_timeouts_types type);
 
 #define mlx5_tout_ms(dev, type) _mlx5_tout_ms(dev, MLX5_TO_##type##_MS)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/main.c b/drivers/net/ethernet/mellanox/mlx5/core/main.c
index a92a92a..e127c05 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/main.c
@@ -992,11 +992,7 @@ static int mlx5_function_setup(struct mlx5_core_dev *dev, bool boot)
        if (mlx5_core_is_pf(dev))
                pcie_print_link_status(dev->pdev);
 
-       err = mlx5_tout_init(dev);
-       if (err) {
-               mlx5_core_err(dev, "Failed initializing timeouts, aborting\n");
-               return err;
-       }
+       mlx5_tout_set_def_val(dev);
 
        /* wait for firmware to accept initialization segments configurations
         */
@@ -1005,13 +1001,13 @@ static int mlx5_function_setup(struct mlx5_core_dev *dev, bool boot)
        if (err) {
                mlx5_core_err(dev, "Firmware over %llu MS in pre-initializing state, aborting\n",
                              mlx5_tout_ms(dev, FW_PRE_INIT_TIMEOUT));
-               goto err_tout_cleanup;
+               return err;
        }
 
        err = mlx5_cmd_init(dev);
        if (err) {
                mlx5_core_err(dev, "Failed initializing command interface, aborting\n");
-               goto err_tout_cleanup;
+               return err;
        }
 
        mlx5_tout_query_iseg(dev);
@@ -1094,8 +1090,6 @@ err_disable_hca:
 err_cmd_cleanup:
        mlx5_cmd_set_state(dev, MLX5_CMDIF_STATE_DOWN);
        mlx5_cmd_cleanup(dev);
-err_tout_cleanup:
-       mlx5_tout_cleanup(dev);
 
        return err;
 }
@@ -1114,7 +1108,6 @@ static int mlx5_function_teardown(struct mlx5_core_dev *dev, bool boot)
        mlx5_core_disable_hca(dev, 0);
        mlx5_cmd_set_state(dev, MLX5_CMDIF_STATE_DOWN);
        mlx5_cmd_cleanup(dev);
-       mlx5_tout_cleanup(dev);
 
        return 0;
 }
@@ -1476,6 +1469,12 @@ int mlx5_mdev_init(struct mlx5_core_dev *dev, int profile_idx)
                                            mlx5_debugfs_root);
        INIT_LIST_HEAD(&priv->traps);
 
+       err = mlx5_tout_init(dev);
+       if (err) {
+               mlx5_core_err(dev, "Failed initializing timeouts, aborting\n");
+               goto err_timeout_init;
+       }
+
        err = mlx5_health_init(dev);
        if (err)
                goto err_health_init;
@@ -1501,6 +1500,8 @@ err_adev_init:
 err_pagealloc_init:
        mlx5_health_cleanup(dev);
 err_health_init:
+       mlx5_tout_cleanup(dev);
+err_timeout_init:
        debugfs_remove(dev->priv.dbg_root);
        mutex_destroy(&priv->pgdir_mutex);
        mutex_destroy(&priv->alloc_mutex);
@@ -1518,6 +1519,7 @@ void mlx5_mdev_uninit(struct mlx5_core_dev *dev)
        mlx5_adev_cleanup(dev);
        mlx5_pagealloc_cleanup(dev);
        mlx5_health_cleanup(dev);
+       mlx5_tout_cleanup(dev);
        debugfs_remove_recursive(dev->priv.dbg_root);
        mutex_destroy(&priv->pgdir_mutex);
        mutex_destroy(&priv->alloc_mutex);