CyberRota Analysis
AI-GeneratedThe vulnerability in the Linux kernel affects the gntdev_ioctl_map_grant_ref() function, which can lead to a memory leak and dangling list entries due to improper error handling during ioctl operations. This issue could potentially allow for resource exhaustion or instability in systems utilizing the Xen hypervisor. Organizations using Linux systems with Xen should prioritize this fix to ensure stability and prevent potential exploitation of these memory management flaws.
Original NVD Description
In the Linux kernel, the following vulnerability has been resolved: xen/gntdev: fix error handling in ioctl When gntdev_ioctl_map_grant_ref() fails to copy the operation result back to userspace after successfully adding the mapping to the list, the error path returns -EFAULT without releasing the reference acquired by gntdev_alloc_map(). The mapping remains in priv->maps with a refcount of 1, causing a memory leak and a dangling list entry. Additionally, gntdev_add_map() may modify map->index to avoid overlap with existing mappings. Therefore, the index returned to userspace must be obtained after gntdev_add_map() completes. Fix this by holding the mutex across gntdev_add_map(), retrieving the correct index, and copy_to_user(). If copy_to_user() fails, remove the mapping from the list and release the reference while still holding the lock. Fix these issues by properly handling all error cases.