[PATCH v4 1/9] KVM: Fix srcu struct leakage

Jan Kiszka
2010-11-08T11:22:11Z

Clean up the srcu struct on vm destruction and refactor its release on
early errors.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
---
virt/kvm/kvm_main.c | 15 +++++++--------
1 files changed, 7 insertions(+), 8 deletions(-)

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 4111a4b..6cfcde7 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -401,23 +401,19 @@ static struct kvm *kvm_create_vm(void)
r = -ENOMEM;
kvm->memslots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
if (!kvm->memslots)
- goto out_err;
+ goto out_err_nosrcu;
if (init_srcu_struct(&kvm->srcu))
- goto out_err;
+ goto out_err_nosrcu;
for (i = 0; i < KVM_NR_BUSES; i++) {
kvm->buses[i] = kzalloc(sizeof(struct kvm_io_bus),
GFP_KERNEL);
- if (!kvm->buses[i]) {
- cleanup_srcu_struct(&kvm->srcu);
+ if (!kvm->buses[i])
goto out_err;
- }
}

r = kvm_init_mmu_notifier(kvm);
- if (r) {
- cleanup_srcu_struct(&kvm->srcu);
+ if (r)
goto out_err;
- }

kvm->mm = current->mm;
atomic_inc(&kvm->mm->mm_count);
@@ -435,6 +431,8 @@ out:
return kvm;

out_err:
+ cleanup_srcu_struct(&kvm->srcu);
+out_err_nosrcu:
hardware_disable_all();
out_err_nodisable:
for (i = 0; i < KVM_NR_BUSES; i++)
@@ -513,6 +511,7 @@ static void kvm_destroy_vm(struct kvm *kvm)
#else
kvm_arch_flush_shadow(kvm);
#endif
+ cleanup_srcu_struct(&kvm->srcu);
kvm_arch_destroy_vm(kvm);
hardware_disable_all();
mmdrop(mm);
--
1.7.1