1. 02 Mar, 2020 1 commit
    • Wanpeng Li's avatar
      KVM: X86: Fix dereference null cpufreq policy · 9a11997e
      Wanpeng Li authored
      Naresh Kamboju reported:
      
         Linux version 5.6.0-rc4 (oe-user@oe-host) (gcc version
        (GCC)) #1 SMP Sun Mar 1 22:59:08 UTC 2020
         kvm: no hardware support
         BUG: kernel NULL pointer dereference, address: 000000000000028c
         #PF: supervisor read access in kernel mode
         #PF: error_code(0x0000) - not-present page
         PGD 0 P4D 0
         Oops: 0000 [#1] SMP NOPTI
         CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.6.0-rc4 #1
         Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
        04/01/2014
         RIP: 0010:kobject_put+0x12/0x1c0
         Call Trace:
          cpufreq_cpu_put+0x15/0x20
          kvm_arch_init+0x1f6/0x2b0
          kvm_init+0x31/0x290
          ? svm_check_processor_compat+0xd/0xd
          ? svm_check_processor_compat+0xd/0xd
          svm_init+0x21/0x23
          do_one_initcall+0x61/0x2f0
          ? rdinit_setup+0x30/0x30
          ? rcu_read_lock_sched_held+0x4f/0x80
          kernel_init_freeable+0x219/0x279
          ? rest_init+0x250/0x250
          kernel_init+0xe/0x110
          ret_from_fork+0x27/0x50
         Modules linked in:
         CR2: 000000000000028c
         ---[ end trace 239abf40c55c409b ]---
         RIP: 0010:kobject_put+0x12/0x1c0
      
      cpufreq policy which is get by cpufreq_cpu_get() can be NULL if it is failure,
      this patch takes care of it.
      
      Fixes: aaec7c03 (KVM: x86: avoid useless copy of cpufreq policy)
      Reported-by: default avatarNaresh Kamboju <naresh.kamboju@linaro.org>
      Cc: Naresh Kamboju <naresh.kamboju@linaro.org>
      Signed-off-by: default avatarWanpeng Li <wanpengli@tencent.com>
      Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
      9a11997e
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