linux-kernel - [PATCH v2] KVM: x86: Assign correct value to array.maxnent

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20200604041636.1187-1-xiaoyao.li@intel.com>
Date:   Thu,  4 Jun 2020 12:16:36 +0800
From:   Xiaoyao Li <xiaoyao.li@...el.com>
To:     Sean Christopherson <sean.j.christopherson@...el.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Xiaoyao Li <xiaoyao.li@...el.com>
Subject: [PATCH v2] KVM: x86: Assign correct value to array.maxnent

Delay the assignment of array.maxnent to use correct value for the case
cpuid->nent > KVM_MAX_CPUID_ENTRIES.

Fixes: e53c95e8d41e ("KVM: x86: Encapsulate CPUID entries and metadata in struct")
Signed-off-by: Xiaoyao Li <xiaoyao.li@...el.com>
---
v2:
   - remove "const" of maxnent to fix build error.
---
 arch/x86/kvm/cpuid.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 253b8e875ccd..3d88ddf781d0 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -426,7 +426,7 @@ EXPORT_SYMBOL_GPL(kvm_set_cpu_caps);
 
 struct kvm_cpuid_array {
 	struct kvm_cpuid_entry2 *entries;
-	const int maxnent;
+	int maxnent;
 	int nent;
 };
 
@@ -870,7 +870,6 @@ int kvm_dev_ioctl_get_cpuid(struct kvm_cpuid2 *cpuid,
 
 	struct kvm_cpuid_array array = {
 		.nent = 0,
-		.maxnent = cpuid->nent,
 	};
 	int r, i;
 
@@ -887,6 +886,8 @@ int kvm_dev_ioctl_get_cpuid(struct kvm_cpuid2 *cpuid,
 	if (!array.entries)
 		return -ENOMEM;
 
+	array.maxnent = cpuid->nent;
+
 	for (i = 0; i < ARRAY_SIZE(funcs); i++) {
 		r = get_cpuid_func(&array, funcs[i], type);
 		if (r)
-- 
2.18.2