linux-hardening - Coverity: handle_vmclear(): Error handling issues

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Message-ID: <202212010825.C23022D@keescook>
Date:   Thu, 1 Dec 2022 08:25:24 -0800
From:   coverity-bot <keescook@...omium.org>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        kvm@...r.kernel.org, Dave Hansen <dave.hansen@...ux.intel.com>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        linux-next@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Coverity: handle_vmclear(): Error handling issues

Hello!

This is an experimental semi-automated report about issues detected by
Coverity from a scan of next-20221201 as part of the linux-next scan project:
https://scan.coverity.com/projects/linux-next-weekly-scan

You're getting this email because you were associated with the identified
lines of code (noted below) that were touched by commits:

  Fri Dec 14 17:59:46 2018 +0100
    55d2375e58a6 ("KVM: nVMX: Move nested code to dedicated files")

Coverity reported the following:

*** CID 1527765:  Error handling issues  (CHECKED_RETURN)
arch/x86/kvm/vmx/nested.c:5269 in handle_vmclear()
5263     	 */
5264     	if (likely(!guest_cpuid_has_evmcs(vcpu) ||
5265     		   !evmptr_is_valid(nested_get_evmptr(vcpu)))) {
5266     		if (vmptr == vmx->nested.current_vmptr)
5267     			nested_release_vmcs12(vcpu);
5268
vvv     CID 1527765:  Error handling issues  (CHECKED_RETURN)
vvv     Calling "kvm_vcpu_write_guest" without checking return value (as is done elsewhere 7 out of 8 times).
5269     		kvm_vcpu_write_guest(vcpu,
5270     				     vmptr + offsetof(struct vmcs12,
5271     						      launch_state),
5272     				     &zero, sizeof(zero));
5273     	} else if (vmx->nested.hv_evmcs && vmptr == vmx->nested.hv_evmcs_vmptr) {
5274     		nested_release_evmcs(vcpu);

If this is a false positive, please let us know so we can mark it as
such, or teach the Coverity rules to be smarter. If not, please make
sure fixes get into linux-next. :) For patches fixing this, please
include these lines (but double-check the "Fixes" first):

Reported-by: coverity-bot <keescook+coverity-bot@...omium.org>
Addresses-Coverity-ID: 1527765 ("Error handling issues")
Fixes: 55d2375e58a6 ("KVM: nVMX: Move nested code to dedicated files")

Thanks for your attention!

-- 
Coverity-bot