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KVM: x86: Fix NULL dereference at kvm_msr_ignored_check()

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The newly introduced kvm_msr_ignored_check() tries to print error or
debug messages via vcpu_*() macros, but those may cause Oops when NULL
vcpu is passed for KVM_GET_MSRS ioctl.

Fix it by replacing the print calls with kvm_*() macros.

(Note that this will leave vcpu argument completely unused in the
 function, but I didn't touch it to make the fix as small as
 possible.  A clean up may be applied later.)

Fixes: 12bc2132b1 ("KVM: X86: Do the same ignore_msrs check for feature msrs")
BugLink: https://bugzilla.suse.com/show_bug.cgi?id=1178280
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Message-Id: <20201030151414.20165-1-tiwai@suse.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Takashi Iwai 2020-10-30 16:14:14 +01:00 committed by Paolo Bonzini
parent 8a967d655e
commit d383b3146d
1 changed files with 4 additions and 4 deletions
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8
arch/x86/kvm/x86.c
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@ -265,13 +265,13 @@ static int kvm_msr_ignored_check(struct kvm_vcpu *vcpu, u32 msr,
if (ignore_msrs) {
if (report_ignored_msrs)
vcpu_unimpl(vcpu, "ignored %s: 0x%x data 0x%llx\n",
op, msr, data);
kvm_pr_unimpl("ignored %s: 0x%x data 0x%llx\n",
op, msr, data);
/* Mask the error */
return 0;
} else {
vcpu_debug_ratelimited(vcpu, "unhandled %s: 0x%x data 0x%llx\n",
op, msr, data);
kvm_debug_ratelimited("unhandled %s: 0x%x data 0x%llx\n",
op, msr, data);
return -ENOENT;
}
}