CVE-2025-68779 — net/mlx5e: Avoid unregistering PSP twice

Affected: Linux

In the Linux kernel, the following vulnerability has been resolved:

net/mlx5e: Avoid unregistering PSP twice

PSP is unregistered twice in: _mlx5e_remove -> mlx5e_psp_unregister mlx5e_nic_cleanup -> mlx5e_psp_unregister

This leads to a refcount underflow in some conditions: ------------[ cut here ]------------ refcount_t: underflow; use-after-free. WARNING: CPU: 2 PID: 1694 at lib/refcount.c:28 refcount_warn_saturate+0xd8/0xe0 [...] mlx5e_psp_unregister+0x26/0x50 [mlx5_core] mlx5e_nic_cleanup+0x26/0x90 [mlx5_core] mlx5e_remove+0xe6/0x1f0 [mlx5_core] auxiliary_bus_remove+0x18/0x30 device_release_driver_internal+0x194/0x1f0 bus_remove_device+0xc6/0x130 device_del+0x159/0x3c0 mlx5_rescan_drivers_locked+0xbc/0x2a0 [mlx5_core] [...]

Do not directly remove psp from the _mlx5e_remove path, the PSP cleanup happens as part of profile cleanup.

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CVE-2025-68779 — net/mlx5e: Avoid unregistering PSP twice