Description
In the Linux kernel, the following vulnerability has been resolved: virtio-mmio: don't break lifecycle of vm_dev vm_dev has a separate lifecycle because it has a 'struct device' embedded. Thus, having a release callback for it is correct. Allocating the vm_dev struct with devres totally breaks this protection, though. Instead of waiting for the vm_dev release callback, the memory is freed when the platform_device is removed. Resulting in a use-after-free when finally the callback is to be called. To easily see the problem, compile the kernel with CONFIG_DEBUG_KOBJECT_RELEASE and unbind with sysfs. The fix is easy, don't use devres in this case. Found during my research about object lifetime problems.
Product status
7eb781b1bbb7136fe78fb8c28c1c223c61fa32b5 before 97a2d55ead76358245b446efd87818e919196d7a
7eb781b1bbb7136fe78fb8c28c1c223c61fa32b5 before b788ad3b2468512339c05f23692e36860264e674
7eb781b1bbb7136fe78fb8c28c1c223c61fa32b5 before 3ff54d904fafabd0912796785e53cce4e69ca123
7eb781b1bbb7136fe78fb8c28c1c223c61fa32b5 before 5b7d5c2dd664eb8b9a06ecbc06e28d39359c422e
7eb781b1bbb7136fe78fb8c28c1c223c61fa32b5 before af5818c35173e096085c6ae2e3aac605d3d15e41
7eb781b1bbb7136fe78fb8c28c1c223c61fa32b5 before 2dcb368fe5a8eee498ca75c93a18ce2f3b0d6a8e
7eb781b1bbb7136fe78fb8c28c1c223c61fa32b5 before 55c91fedd03d7b9cf0c5199b2eb12b9b8e95281a
4.15
Any version before 4.15
4.19.293
5.4.255
5.10.192
5.15.128
6.1.47
6.4.12
6.5
References
git.kernel.org/...c/97a2d55ead76358245b446efd87818e919196d7a
git.kernel.org/...c/b788ad3b2468512339c05f23692e36860264e674
git.kernel.org/...c/3ff54d904fafabd0912796785e53cce4e69ca123
git.kernel.org/...c/5b7d5c2dd664eb8b9a06ecbc06e28d39359c422e
git.kernel.org/...c/af5818c35173e096085c6ae2e3aac605d3d15e41
git.kernel.org/...c/2dcb368fe5a8eee498ca75c93a18ce2f3b0d6a8e
git.kernel.org/...c/55c91fedd03d7b9cf0c5199b2eb12b9b8e95281a
