CVE-2024-50041

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> i40e: Fix macvlan leak by synchronizing access to mac_filter_hash<br /> <br /> This patch addresses a macvlan leak issue in the i40e driver caused by<br /> concurrent access to vsi-&gt;mac_filter_hash. The leak occurs when multiple<br /> threads attempt to modify the mac_filter_hash simultaneously, leading to<br /> inconsistent state and potential memory leaks.<br /> <br /> To fix this, we now wrap the calls to i40e_del_mac_filter() and zeroing<br /> vf-&gt;default_lan_addr.addr with spin_lock/unlock_bh(&amp;vsi-&gt;mac_filter_hash_lock),<br /> ensuring atomic operations and preventing concurrent access.<br /> <br /> Additionally, we add lockdep_assert_held(&amp;vsi-&gt;mac_filter_hash_lock) in<br /> i40e_add_mac_filter() to help catch similar issues in the future.<br /> <br /> Reproduction steps:<br /> 1. Spawn VFs and configure port vlan on them.<br /> 2. Trigger concurrent macvlan operations (e.g., adding and deleting<br /> portvlan and/or mac filters).<br /> 3. Observe the potential memory leak and inconsistent state in the<br /> mac_filter_hash.<br /> <br /> This synchronization ensures the integrity of the mac_filter_hash and prevents<br /> the described leak.