CVE-2022-49223

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> cxl/port: Hold port reference until decoder release<br /> <br /> KASAN + DEBUG_KOBJECT_RELEASE reports a potential use-after-free in<br /> cxl_decoder_release() where it goes to reference its parent, a cxl_port,<br /> to free its id back to port-&gt;decoder_ida.<br /> <br /> BUG: KASAN: use-after-free in to_cxl_port+0x18/0x90 [cxl_core]<br /> Read of size 8 at addr ffff888119270908 by task kworker/35:2/379<br /> <br /> CPU: 35 PID: 379 Comm: kworker/35:2 Tainted: G OE 5.17.0-rc2+ #198<br /> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015<br /> Workqueue: events kobject_delayed_cleanup<br /> Call Trace:<br /> <br /> dump_stack_lvl+0x59/0x73<br /> print_address_description.constprop.0+0x1f/0x150<br /> ? to_cxl_port+0x18/0x90 [cxl_core]<br /> kasan_report.cold+0x83/0xdf<br /> ? to_cxl_port+0x18/0x90 [cxl_core]<br /> to_cxl_port+0x18/0x90 [cxl_core]<br /> cxl_decoder_release+0x2a/0x60 [cxl_core]<br /> device_release+0x5f/0x100<br /> kobject_cleanup+0x80/0x1c0<br /> <br /> The device core only guarantees parent lifetime until all children are<br /> unregistered. If a child needs a parent to complete its -&gt;release()<br /> callback that child needs to hold a reference to extend the lifetime of<br /> the parent.