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Nikunj A Dadhania 247b6244d4 KVM: x86: Check for rmaps allocation 
commit fffb532378 upstream.

With TDP MMU being the default now, access to mmu_rmaps_stat debugfs
file causes following oops:

BUG: kernel NULL pointer dereference, address: 0000000000000000
PGD 0 P4D 0
Oops: 0000 [#1] PREEMPT SMP NOPTI
CPU: 7 PID: 3185 Comm: cat Not tainted 5.16.0-rc4+ #204
RIP: 0010:pte_list_count+0x6/0x40
 Call Trace:
  <TASK>
  ? kvm_mmu_rmaps_stat_show+0x15e/0x320
  seq_read_iter+0x126/0x4b0
  ? aa_file_perm+0x124/0x490
  seq_read+0xf5/0x140
  full_proxy_read+0x5c/0x80
  vfs_read+0x9f/0x1a0
  ksys_read+0x67/0xe0
  __x64_sys_read+0x19/0x20
  do_syscall_64+0x3b/0xc0
  entry_SYSCALL_64_after_hwframe+0x44/0xae
 RIP: 0033:0x7fca6fc13912

Return early when rmaps are not present.

Reported-by: Vasant Hegde <vasant.hegde@amd.com>
Tested-by: Vasant Hegde <vasant.hegde@amd.com>
Signed-off-by: Nikunj A Dadhania <nikunj@amd.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20220105040337.4234-1-nikunj@amd.com>
Cc: stable@vger.kernel.org
Fixes: 3bcd0662d6 ("KVM: X86: Introduce mmu_rmaps_stat per-vm debugfs file")
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-01-11 15:35:15 +01:00
..
alpha alpha: enable GENERIC_PCI_IOMAP unconditionally 2021-09-19 10:37:00 -07:00
arc signal: Replace force_sigsegv(SIGSEGV) with force_fatal_sig(SIGSEGV) 2021-11-25 09:49:06 +01:00
arm efi: Move efifb_setup_from_dmi() prototype from arch headers 2022-01-05 12:42:34 +01:00
arm64 efi: Move efifb_setup_from_dmi() prototype from arch headers 2022-01-05 12:42:34 +01:00
csky csky: fix typo of fpu config macro 2021-12-14 10:57:22 +01:00
h8300 Merge branch 'akpm' (patches from Andrew) 2021-09-08 12:55:35 -07:00
hexagon hexagon: clean up timer-regs.h 2021-11-25 09:48:42 +01:00
ia64 ia64: don't do IA64_CMPXCHG_DEBUG without CONFIG_PRINTK 2021-11-18 19:16:13 +01:00
m68k signal: Replace force_fatal_sig with force_exit_sig when in doubt 2021-11-25 09:49:07 +01:00
microblaze Microblaze patches for 5.15-rc1 2021-09-08 16:02:13 -07:00
mips MIPS: use 3-level pgtable for 64KB page size on MIPS_VA_BITS_48 2021-12-01 09:04:53 +01:00
nds32 ftrace/nds32: Update the proto for ftrace_trace_function to match ftrace_stub 2021-10-27 13:00:17 -04:00
nios2 nios2: Make NIOS2_DTB_SOURCE_BOOL depend on !COMPILE_TEST 2021-10-27 09:29:07 -05:00
openrisc openrisc: fix SMP tlb flush NULL pointer dereference 2021-11-18 19:17:06 +01:00
parisc parisc: Clear stale IIR value on instruction access rights trap 2022-01-05 12:42:33 +01:00
powerpc powerpc/ptdump: Fix DEBUG_WX since generic ptdump conversion 2022-01-05 12:42:33 +01:00
riscv efi: Move efifb_setup_from_dmi() prototype from arch headers 2022-01-05 12:42:34 +01:00
s390 s390/kexec_file: fix error handling when applying relocations 2021-12-22 09:32:40 +01:00
sh sh: define __BIG_ENDIAN for math-emu 2021-11-25 09:48:31 +01:00
sparc signal: Replace force_fatal_sig with force_exit_sig when in doubt 2021-11-25 09:49:07 +01:00
um signal: Replace force_sigsegv(SIGSEGV) with force_fatal_sig(SIGSEGV) 2021-11-25 09:49:06 +01:00
x86 KVM: x86: Check for rmaps allocation 2022-01-11 15:35:15 +01:00
xtensa xtensa: xtfpga: Try software restart before simulating CPU reset 2021-10-05 12:19:05 -07:00
.gitignore
Kconfig arch/cc: Introduce a function to check for confidential computing features 2021-11-18 19:17:21 +01:00