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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
68b025c813c2eb41ff25628e3d4952d5185eb1a4 to < 52dc40ef0cfee6ae89b7524967e73f0ba37906d7affected68b025c813c2eb41ff25628e3d4952d5185eb1a4 to < 1dd9cb98fe228e017fff9efb33862ff38c741b65affected68b025c813c2eb41ff25628e3d4952d5185eb1a4 to < 6df926130aee6cab9b5d2e5b7862e49ccac348dcaffected68b025c813c2eb41ff25628e3d4952d5185eb1a4 to < 311011f8cc206c5af2877b03e3f627ee1b8fe024affected68b025c813c2eb41ff25628e3d4952d5185eb1a4 to < 18a693733f7ad004e1ab0466693121ca70cd95ddaffected68b025c813c2eb41ff25628e3d4952d5185eb1a4 to < 16d3ccdabb8dee9be2cdcd6d3f9a125572ec0454affected68b025c813c2eb41ff25628e3d4952d5185eb1a4 to < 6883269a323609f68f6faa903f8f8ff3d191cec8affected68b025c813c2eb41ff25628e3d4952d5185eb1a4 to < 45ca1afe2fd14c04e37227e79d3f8455831d8408affected
Linux Linux
Default version status: affected
2.6.39affected0 to < 2.6.39unaffected5.10.261 to ≤ 5.10.*unaffected5.15.212 to ≤ 5.15.*unaffected6.1.178 to ≤ 6.1.*unaffected6.6.145 to ≤ 6.6.*unaffected6.12.97 to ≤ 6.12.*unaffected6.18.40 to ≤ 6.18.*unaffected7.1.5 to ≤ 7.1.*unaffected7.2 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/52dc40ef0cfee6ae89b7524967e73f0ba37906d7 ↗
- https://git.kernel.org/stable/c/1dd9cb98fe228e017fff9efb33862ff38c741b65 ↗
- https://git.kernel.org/stable/c/6df926130aee6cab9b5d2e5b7862e49ccac348dc ↗
- https://git.kernel.org/stable/c/311011f8cc206c5af2877b03e3f627ee1b8fe024 ↗
- https://git.kernel.org/stable/c/18a693733f7ad004e1ab0466693121ca70cd95dd ↗
- https://git.kernel.org/stable/c/16d3ccdabb8dee9be2cdcd6d3f9a125572ec0454 ↗
- https://git.kernel.org/stable/c/6883269a323609f68f6faa903f8f8ff3d191cec8 ↗
- https://git.kernel.org/stable/c/45ca1afe2fd14c04e37227e79d3f8455831d8408 ↗