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net/mlx5: Devcom, fix error flow in mlx5_devcom_register_device

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commit af87194352 upstream.

In case devcom allocation is failed, mlx5 is always freeing the priv.
However, this priv might have been allocated by a different thread,
and freeing it might lead to use-after-free bugs.
Fix it by freeing the priv only in case it was allocated by the
running thread.

Fixes: fadd59fc50 ("net/mlx5: Introduce inter-device communication mechanism")
Signed-off-by: Shay Drory <shayd@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Shay Drory
2023-05-02 13:35:11 +03:00
committed by Greg Kroah-Hartman
parent a89a69cea4
commit 1e75506536
1 changed files with 2 additions and 1 deletions
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3
drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.c
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@@ -110,7 +110,8 @@ struct mlx5_devcom *mlx5_devcom_register_device(struct mlx5_core_dev *dev)
priv->devs[idx] = dev;
devcom = mlx5_devcom_alloc(priv, idx);
if (!devcom) {
kfree(priv);
if (new_priv)
kfree(priv);
return ERR_PTR(-ENOMEM);
}