CVE-2022-49894

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> cxl/region: Fix region HPA ordering validation<br /> <br /> Some regions may not have any address space allocated. Skip them when<br /> validating HPA order otherwise a crash like the following may result:<br /> <br /> devm_cxl_add_region: cxl_acpi cxl_acpi.0: decoder3.4: created region9<br /> BUG: kernel NULL pointer dereference, address: 0000000000000000<br /> [..]<br /> RIP: 0010:store_targetN+0x655/0x1740 [cxl_core]<br /> [..]<br /> Call Trace:<br /> <br /> kernfs_fop_write_iter+0x144/0x200<br /> vfs_write+0x24a/0x4d0<br /> ksys_write+0x69/0xf0<br /> do_syscall_64+0x3a/0x90<br /> <br /> store_targetN+0x655/0x1740:<br /> alloc_region_ref at drivers/cxl/core/region.c:676<br /> (inlined by) cxl_port_attach_region at drivers/cxl/core/region.c:850<br /> (inlined by) cxl_region_attach at drivers/cxl/core/region.c:1290<br /> (inlined by) attach_target at drivers/cxl/core/region.c:1410<br /> (inlined by) store_targetN at drivers/cxl/core/region.c:1453