CVE-2024-57875

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

block: RCU protect disk->conv_zones_bitmap

Ensure that a disk revalidation changing the conventional zones bitmap

of a disk does not cause invalid memory references when using the

disk_zone_is_conv() helper by RCU protecting the disk->conv_zones_bitmap

pointer.

disk_zone_is_conv() is modified to operate under the RCU read lock and

the function disk_set_conv_zones_bitmap() is added to update a disk

conv_zones_bitmap pointer using rcu_replace_pointer() with the disk

zone_wplugs_lock spinlock held.

disk_free_zone_resources() is modified to call

disk_update_zone_resources() with a NULL bitmap pointer to free the disk

conv_zones_bitmap. disk_set_conv_zones_bitmap() is also used in

disk_update_zone_resources() to set the new (revalidated) bitmap and

free the old one.