CVE-2023-54024

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

KVM: Destroy target device if coalesced MMIO unregistration fails

Destroy and free the target coalesced MMIO device if unregistering said device fails. As clearly noted in the code, kvmiobusunregisterdev() does not destroy the target device.

BUG: memory leak unreferenced object 0xffff888112a54880 (size 64): comm "syz-executor.2", pid 5258, jiffies 4297861402 (age 14.129s) hex dump (first 32 bytes): 38 c7 67 15 00 c9 ff ff 38 c7 67 15 00 c9 ff ff 8.g.....8.g..... e0 c7 e1 83 ff ff ff ff 00 30 67 15 00 c9 ff ff .........0g..... backtrace: [<0000000006995a8a>] kmalloc include/linux/slab.h:556 [inline] [<0000000006995a8a>] kzalloc include/linux/slab.h:690 [inline] [<0000000006995a8a>] kvmvmioctlregistercoalescedmmio+0x8e/0x3d0 arch/x86/kvm/../../../virt/kvm/coalescedmmio.c:150 [<00000000022550c2>] kvmvmioctl+0x47d/0x1600 arch/x86/kvm/../../../virt/kvm/kvmmain.c:3323 [<000000008a75102f>] vfsioctl fs/ioctl.c:46 [inline] [<000000008a75102f>] fileioctl fs/ioctl.c:509 [inline] [<000000008a75102f>] dovfsioctl+0xbab/0x1160 fs/ioctl.c:696 [<0000000080e3f669>] ksysioctl+0x76/0xa0 fs/ioctl.c:713 [<0000000059ef4888>] __dosysioctl fs/ioctl.c:720 [inline] [<0000000059ef4888>] __sesysioctl fs/ioctl.c:718 [inline] [<0000000059ef4888>] __x64sysioctl+0x6f/0xb0 fs/ioctl.c:718 [<000000006444fa05>] dosyscall64+0x9f/0x4e0 arch/x86/entry/common.c:290 [<000000009a4ed50b>] entrySYSCALL64afterhwframe+0x49/0xbe

BUG: leak checking failed