diff options
authorTakashi Iwai <tiwai@suse.de>2020-10-30 16:14:14 +0100
committerPaolo Bonzini <pbonzini@redhat.com>2020-10-30 13:40:31 -0400
commitd383b3146d805a743658225c8973f5d38c6fedf4 (patch)
parent8a967d655e406c8a63744a60b221071fad9a736b (diff)
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>
1 files changed, 4 insertions, 4 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 397f599b20e5..f5ede41bf9e6 100644
--- 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;

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