CVE-2024-26858

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> net/mlx5e: Use a memory barrier to enforce PTP WQ xmit submission tracking occurs after populating the metadata_map<br /> <br /> Just simply reordering the functions mlx5e_ptp_metadata_map_put and<br /> mlx5e_ptpsq_track_metadata in the mlx5e_txwqe_complete context is not good<br /> enough since both the compiler and CPU are free to reorder these two<br /> functions. If reordering does occur, the issue that was supposedly fixed by<br /> 7e3f3ba97e6c ("net/mlx5e: Track xmit submission to PTP WQ after populating<br /> metadata map") will be seen. This will lead to NULL pointer dereferences in<br /> mlx5e_ptpsq_mark_ts_cqes_undelivered in the NAPI polling context due to the<br /> tracking list being populated before the metadata map.