diff options
| author | Takashi Iwai <tiwai@suse.de> | 2020-10-30 16:14:14 +0100 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-10-30 13:40:31 -0400 |
| commit | d383b3146d805a743658225c8973f5d38c6fedf4 (patch) | |
| tree | fef1b60f70ce1e11c548aa919e97c1596484afbc | |
| parent | 8a967d655e406c8a63744a60b221071fad9a736b (diff) | |
| download | lwn-d383b3146d805a743658225c8973f5d38c6fedf4.tar.gz lwn-d383b3146d805a743658225c8973f5d38c6fedf4.zip | |
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>
| -rw-r--r-- | arch/x86/kvm/x86.c | 8 |
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; } } |