Sean Christopherson b0e44dfb4e x86/hyperv: Fix NULL deref in set_hv_tscchange_cb() if Hyper-V setup fails ... commit daf972118c upstream. Check for a valid hv_vp_index array prior to derefencing hv_vp_index when setting Hyper-V's TSC change callback. If Hyper-V setup failed in hyperv_init(), the kernel will still report that it's running under Hyper-V, but will have silently disabled nearly all functionality. BUG: kernel NULL pointer dereference, address: 0000000000000010 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: 0000 [#1] SMP CPU: 4 PID: 1 Comm: swapper/0 Not tainted 5.15.0-rc2+ #75 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015 RIP: 0010:set_hv_tscchange_cb+0x15/0xa0 Code: <8b> 04 82 8b 15 12 17 85 01 48 c1 e0 20 48 0d ee 00 01 00 f6 c6 08 ... Call Trace: kvm_arch_init+0x17c/0x280 kvm_init+0x31/0x330 vmx_init+0xba/0x13a do_one_initcall+0x41/0x1c0 kernel_init_freeable+0x1f2/0x23b kernel_init+0x16/0x120 ret_from_fork+0x22/0x30 Fixes: 93286261de ("x86/hyperv: Reenlightenment notifications support") Cc: stable@vger.kernel.org Cc: Vitaly Kuznetsov <vkuznets@redhat.com> Signed-off-by: Sean Christopherson <seanjc@google.com> Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com> Link: https://lore.kernel.org/r/20211104182239.1302956-2-seanjc@google.com Signed-off-by: Wei Liu <wei.liu@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2021-11-26 10:47:21 +01:00
..
boot	x86/boot: Add .text.* to setup.ld	2021-06-16 11:59:38 +02:00
configs	vgacon: remove software scrollback support	2020-09-17 13:47:54 +02:00
crypto	crypto: x86/aes-ni-xts - use direct calls to and 4-way stride	2021-03-20 10:39:47 +01:00
entry	x86/asm/32: Add ENDs to some functions and relabel with SYM_CODE_*	2021-01-17 14:05:30 +01:00
events	perf/x86/intel/uncore: Fix IIO event constraints for Skylake Server	2021-11-26 10:47:20 +01:00
hyperv	x86/hyperv: Fix NULL deref in set_hv_tscchange_cb() if Hyper-V setup fails	2021-11-26 10:47:21 +01:00
ia32	syscalls/x86: Use COMPAT_SYSCALL_DEFINE0 for IA32 (rt_)sigreturn	2020-01-17 19:48:30 +01:00
include	x86: Increase exception stack sizes	2021-11-17 09:48:28 +01:00
kernel	x86/irq: Ensure PI wakeup handler is unregistered before module unload	2021-11-17 09:48:19 +01:00
kvm	KVM: nVMX: Query current VMCS when determining if MSR bitmaps are in use	2021-11-17 09:48:24 +01:00
lib	x86/msr: Fix wr/rdmsr_safe_regs_on_cpu() prototypes	2021-05-22 11:38:27 +02:00
math-emu	x86: math-emu: Fix up 'cmp' insn for clang ias	2020-07-29 10:18:40 +02:00
mm	x86/sme: Use #define USE_EARLY_PGTABLE_L5 in mem_encrypt_identity.c	2021-11-17 09:48:19 +01:00
net	bpf: Introduce BPF nospec instruction for mitigating Spectre v4	2021-09-15 09:47:38 +02:00
oprofile
pci	PCI: Add AMD RS690 quirk to enable 64-bit DMA	2021-06-30 08:47:49 -04:00
platform	x86/platform/olpc: Correct ifdef symbol to intended CONFIG_OLPC_XO15_SCI	2021-10-13 10:08:20 +02:00
power	x86/asm/32: Add ENDs to some functions and relabel with SYM_CODE_*	2021-01-17 14:05:30 +01:00
purgatory	x86/purgatory: Disable various profiling and sanitizing options	2020-06-24 17:50:20 +02:00
ras
realmode	x86/asm/32: Add ENDs to some functions and relabel with SYM_CODE_*	2021-01-17 14:05:30 +01:00
tools	x86/tools: Fix objdump version check again	2021-08-18 08:57:01 +02:00
um	um: Implement copy_thread_tls	2020-01-14 20:08:35 +01:00
video
xen	xen/x86: fix PV trap handling on secondary processors	2021-09-30 10:09:21 +02:00
.gitignore
Kbuild
Kconfig	x86/Kconfig: Do not enable AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT automatically	2021-10-20 11:40:15 +02:00
Kconfig.cpu
Kconfig.debug	x86, perf: Fix the dependency of the x86 insn decoder selftest	2019-09-02 20:05:58 +02:00
Makefile	x86/build: Propagate $(CLANG_FLAGS) to $(REALMODE_FLAGS)	2021-05-11 14:04:06 +02:00
Makefile.um
Makefile_32.cpu