Description
In the Linux kernel, the following vulnerability has been resolved: drm/virtio: fix object leak when drm_gem_handle_create() fails virtio_gpu_gem_create() owns the reference taken by virtio_gpu_object_create(). On the drm_gem_handle_create() error path it calls drm_gem_object_release() instead of dropping that reference. drm_gem_object_release() is the inverse of drm_gem_object_init() and does not touch the reference count or call obj->funcs->free(), so it is only correct as the last step of a destructor, as in virtio_gpu_cleanup_object(). Using it here leaves the bo at refcount 1 with no remaining reference, so virtio_gpu_free_object() never runs and the shmem pages, sg table and virtio_gpu_object are leaked. Since virtio_gpu_object_create() has already set bo->created, VIRTIO_GPU_CMD_RESOURCE_UNREF is not queued either, leaking the host-side resource and the resource id. drm_gem_handle_create_tail() drops the handle reference on all of its internal error paths, so the caller only has to drop its own. Use drm_gem_object_put(), matching the success path below.
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
dc5698e80cf724770283e10414054662bdf6ccfa to < 13423a058187c2039aa8cb235c916be4477221b7affecteddc5698e80cf724770283e10414054662bdf6ccfa to < 687be2f8b5e0e0ca9a7028f8f6413d0ed3fbb9dcaffecteddc5698e80cf724770283e10414054662bdf6ccfa to < 264ae8ac8fd625b6c118baf16c111adeee2ec632affecteddc5698e80cf724770283e10414054662bdf6ccfa to < e2edd2d78d2cf8446de017adec9598feefed3297affecteddc5698e80cf724770283e10414054662bdf6ccfa to < 372e9c3d45f664a2c000427ccbf6cdc2f99b3170affecteddc5698e80cf724770283e10414054662bdf6ccfa to < a93dce15dfef200c346b050a2acbed516cc62706affecteddc5698e80cf724770283e10414054662bdf6ccfa to < f75066c79d1eec453c0d386ef8636873d1e11f2caffecteddc5698e80cf724770283e10414054662bdf6ccfa to < 36570ef2244cc4d7563b1f0157bc0f032498638caffected
Linux Linux
Default version status: affected
4.2affected0 to < 4.2unaffected5.10.271 to ≤ 5.10.*unaffected5.15.222 to ≤ 5.15.*unaffected6.1.189 to ≤ 6.1.*unaffected6.6.158 to ≤ 6.6.*unaffected6.12.112 to ≤ 6.12.*unaffected6.18.55 to ≤ 6.18.*unaffected7.2.9 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/13423a058187c2039aa8cb235c916be4477221b7 ↗
- https://git.kernel.org/stable/c/687be2f8b5e0e0ca9a7028f8f6413d0ed3fbb9dc ↗
- https://git.kernel.org/stable/c/264ae8ac8fd625b6c118baf16c111adeee2ec632 ↗
- https://git.kernel.org/stable/c/e2edd2d78d2cf8446de017adec9598feefed3297 ↗
- https://git.kernel.org/stable/c/372e9c3d45f664a2c000427ccbf6cdc2f99b3170 ↗
- https://git.kernel.org/stable/c/a93dce15dfef200c346b050a2acbed516cc62706 ↗
- https://git.kernel.org/stable/c/f75066c79d1eec453c0d386ef8636873d1e11f2c ↗
- https://git.kernel.org/stable/c/36570ef2244cc4d7563b1f0157bc0f032498638c ↗