Subject: Coverity: handle_vmclear(): Error handling issues

From: coverity-bot <[email-masked]>
Date: Thu, 1 Dec 2022 08:25:24 -0800

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 <[email-masked]>
Addresses-Coverity-ID: 1527765 ("Error handling issues")
Fixes: 55d2375e58a6 ("KVM: nVMX: Move nested code to dedicated files")

Thanks for your attention!

-- 
Coverity-bot