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KVM: Use kzalloc to avoid allocating kvm_regs from kernel stack

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Since the size of kvm_regs is too big to allocate from kernel stack on ia64,
use kzalloc to allocate it.

Signed-off-by: Xiantao Zhang <xiantao.zhang@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Xiantao Zhang 2008-02-25 18:52:20 +08:00 committed by Avi Kivity
parent 2d3ad1f40c
commit 3e4bb3ac9e
1 changed files with 22 additions and 11 deletions
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33
virt/kvm/kvm_main.c
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@ -852,28 +852,39 @@ static long kvm_vcpu_ioctl(struct file *filp,
r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
break;
case KVM_GET_REGS: {
struct kvm_regs kvm_regs;
struct kvm_regs *kvm_regs;
memset(&kvm_regs, 0, sizeof kvm_regs);
r = kvm_arch_vcpu_ioctl_get_regs(vcpu, &kvm_regs);
r = -ENOMEM;
kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
if (!kvm_regs)
goto out;
r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs);
if (r)
goto out;
goto out_free1;
r = -EFAULT;
if (copy_to_user(argp, &kvm_regs, sizeof kvm_regs))
goto out;
if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs)))
goto out_free1;
r = 0;
out_free1:
kfree(kvm_regs);
break;
}
case KVM_SET_REGS: {
struct kvm_regs kvm_regs;
struct kvm_regs *kvm_regs;
r = -ENOMEM;
kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
if (!kvm_regs)
goto out;
r = -EFAULT;
if (copy_from_user(&kvm_regs, argp, sizeof kvm_regs))
goto out;
r = kvm_arch_vcpu_ioctl_set_regs(vcpu, &kvm_regs);
if (copy_from_user(kvm_regs, argp, sizeof(struct kvm_regs)))
goto out_free2;
r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs);
if (r)
goto out;
goto out_free2;
r = 0;
out_free2:
kfree(kvm_regs);
break;
}
case KVM_GET_SREGS: {