In the Linux kernel, the following vulnerability has been resolved: dm: fix a crash if blk_alloc_disk fails If blk_alloc_disk fails, the variable md->disk is set to an error value. cleanup_mapped_device will see that md->disk is non-NULL and it will attempt to access it, causing a crash on this statement "md->disk->private_data = NULL;".
https://git.kernel.org/stable/c/fed13a5478680614ba97fc87e71f16e2e197912e
https://git.kernel.org/stable/c/d7aec2a06730b774a97caaf48cbbc58330a85829