CVE-2022-48764

In the Linux kernel, the following vulnerability has been resolved:

KVM: x86: Free kvmcpuidentry2 array on post-KVMRUN KVMSET_CPUID{,2}

Free the "struct kvmcpuidentry2" array on successful post-KVMRUN KVMSETCPUID{,2} to fix a memory leak, the callers of kvmset_cpuid() free the array only on failure.

BUG: memory leak unreferenced object 0xffff88810963a800 (size 2048): comm "syz-executor025", pid 3610, jiffies 4294944928 (age 8.080s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 0d 00 00 00 ................ 47 65 6e 75 6e 74 65 6c 69 6e 65 49 00 00 00 00 GenuntelineI.... backtrace: [<ffffffff814948ee>] kmallocnode include/linux/slab.h:604 [inline] [<ffffffff814948ee>] kvmallocnode+0x3e/0x100 mm/util.c:580 [<ffffffff814950f2>] kvmalloc include/linux/slab.h:732 [inline] [<ffffffff814950f2>] vmemdupuser+0x22/0x100 mm/util.c:199 [<ffffffff8109f5ff>] kvmvcpuioctlsetcpuid2+0x8f/0xf0 arch/x86/kvm/cpuid.c:423 [<ffffffff810711b9>] kvmarchvcpuioctl+0xb99/0x1e60 arch/x86/kvm/x86.c:5251 [<ffffffff8103e92d>] kvmvcpuioctl+0x4ad/0x950 arch/x86/kvm/../../../virt/kvm/kvmmain.c:4066 [<ffffffff815afacc>] vfsioctl fs/ioctl.c:51 [inline] [<ffffffff815afacc>] __dosysioctl fs/ioctl.c:874 [inline] [<ffffffff815afacc>] __sesysioctl fs/ioctl.c:860 [inline] [<ffffffff815afacc>] __x64sysioctl+0xfc/0x140 fs/ioctl.c:860 [<ffffffff844a3335>] dosyscallx64 arch/x86/entry/common.c:50 [inline] [<ffffffff844a3335>] dosyscall64+0x35/0xb0 arch/x86/entry/common.c:80 [<ffffffff84600068>] entrySYSCALL64afterhwframe+0x44/0xae