KVM: x86: Fix NULL dereference at kvm_msr_ignored_check()

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: 12bc2132b15e ("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>

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 397f599..f5ede41 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -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;
        }
 }