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| author | Xiantao Zhang <xiantao.zhang@intel.com> | 2008-02-25 18:52:20 +0800 |
|---|---|---|
| committer | Avi Kivity <avi@qumranet.com> | 2008-04-27 11:53:26 +0300 |
| commit | 3e4bb3ac9e0ada5df5f6729648d403ea9f071d10 (patch) | |
| tree | 3178508a16ef6455908d07be2135ae27c19a8c6c /virt/kvm/kvm_main.c | |
| parent | 2d3ad1f40c841bd3e97d30d423eea53915d085dc (diff) | |
| download | lwn-3e4bb3ac9e0ada5df5f6729648d403ea9f071d10.tar.gz lwn-3e4bb3ac9e0ada5df5f6729648d403ea9f071d10.zip | |
KVM: Use kzalloc to avoid allocating kvm_regs from kernel stack
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>
Diffstat (limited to 'virt/kvm/kvm_main.c')
| -rw-r--r-- | virt/kvm/kvm_main.c | 33 |
1 files changed, 22 insertions, 11 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 31db9b4d3016..41d4b6519136 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -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); - if (r) + 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_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 = -EFAULT; - if (copy_from_user(&kvm_regs, argp, sizeof kvm_regs)) + r = -ENOMEM; + kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL); + if (!kvm_regs) goto out; - r = kvm_arch_vcpu_ioctl_set_regs(vcpu, &kvm_regs); + r = -EFAULT; + 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: { |