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hv: cpuid: don't reference the crossed array

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We should consider the boundary condition although we didn't
access it.

Signed-off-by: Li, Fei1 <fei1.li@intel.com>
This commit is contained in:
Li, Fei1 2018-05-03 12:08:52 +08:00 committed by Jack Ren
parent 3fc5ebcd50
commit b61e6af228
1 changed files with 3 additions and 2 deletions
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5
hypervisor/arch/x86/cpuid.c
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@ -91,12 +91,13 @@ static inline int set_vcpuid_entry(struct vm *vm,
struct vcpuid_entry *tmp; struct vcpuid_entry *tmp;
size_t entry_size = sizeof(struct vcpuid_entry); size_t entry_size = sizeof(struct vcpuid_entry);
tmp = &vm->vcpuid_entries[vm->vcpuid_entry_nr++]; if (vm->vcpuid_entry_nr == MAX_VM_VCPUID_ENTRIES) {
if (vm->vcpuid_entry_nr > MAX_VM_VCPUID_ENTRIES) {
pr_err("%s, vcpuid entry over MAX_VM_VCPUID_ENTRIES(%d)\n", pr_err("%s, vcpuid entry over MAX_VM_VCPUID_ENTRIES(%d)\n",
__func__, MAX_VM_VCPUID_ENTRIES); __func__, MAX_VM_VCPUID_ENTRIES);
return -ENOMEM; return -ENOMEM;
} }
tmp = &vm->vcpuid_entries[vm->vcpuid_entry_nr++];
memcpy_s(tmp, entry_size, entry, entry_size); memcpy_s(tmp, entry_size, entry, entry_size);
return 0; return 0;
} }