linux-kernel - Re: [PATCH] KVM: selftests: Add 'malloc' failure check in test_vmx_nested

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Date: Tue, 23 Apr 2024 13:49:48 +0500
From: Muhammad Usama Anjum <usama.anjum@...labora.com>
To: Kunwu Chan <chentao@...inos.cn>, seanjc@...gle.com,
 kunwu.chan@...mail.com, pbonzini@...hat.com, shuah@...nel.org
Cc: Muhammad Usama Anjum <usama.anjum@...labora.com>, kvm@...r.kernel.org,
 linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] KVM: selftests: Add 'malloc' failure check in
 test_vmx_nested_state

On 4/23/24 12:39 PM, Kunwu Chan wrote:
> There is a 'malloc' call in test_vmx_nested_state function, which can
> be unsuccessful. This patch will add the malloc failure checking
> to avoid possible null dereference and give more information
> about test fail reasons.
LGTM

Reviewed-by: Muhammad Usama Anjum <usama.anjum@...labora.com>

> 
> Signed-off-by: Kunwu Chan <chentao@...inos.cn>
> ---
>  tools/testing/selftests/kvm/x86_64/vmx_set_nested_state_test.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/tools/testing/selftests/kvm/x86_64/vmx_set_nested_state_test.c b/tools/testing/selftests/kvm/x86_64/vmx_set_nested_state_test.c
> index 67a62a5a8895..18afc2000a74 100644
> --- a/tools/testing/selftests/kvm/x86_64/vmx_set_nested_state_test.c
> +++ b/tools/testing/selftests/kvm/x86_64/vmx_set_nested_state_test.c
> @@ -91,6 +91,7 @@ void test_vmx_nested_state(struct kvm_vcpu *vcpu)
>  	const int state_sz = sizeof(struct kvm_nested_state) + getpagesize();
>  	struct kvm_nested_state *state =
>  		(struct kvm_nested_state *)malloc(state_sz);
> +	TEST_ASSERT(state, "-ENOMEM when allocating kvm state");
>  
>  	/* The format must be set to 0. 0 for VMX, 1 for SVM. */
>  	set_default_vmx_state(state, state_sz);

-- 
BR,
Muhammad Usama Anjum