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authorElena Reshetova <elena.reshetova@intel.com>2017-02-20 13:06:21 +0200
committerRadim Krčmář <rkrcmar@redhat.com>2017-03-01 17:03:21 +0100
commite3736c3eb3a6f7c0966923b629c9f92b558aa9c7 (patch)
tree850c343552afe4d498411ba1e767aff4b43f0163 /virt/kvm
parentbba82fd75694832b59433bf4e9d7ede8de1dfd42 (diff)
kvm: convert kvm.users_count from atomic_t to refcount_t
refcount_t type and corresponding API should be used instead of atomic_t when the variable is used as a reference counter. This allows to avoid accidental refcounter overflows that might lead to use-after-free situations. Signed-off-by: Elena Reshetova <elena.reshetova@intel.com> Signed-off-by: Hans Liljestrand <ishkamiel@gmail.com> Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: David Windsor <dwindsor@gmail.com> Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Diffstat (limited to 'virt/kvm')
-rw-r--r--virt/kvm/kvm_main.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index cc4d6e0dd2a2..c6b7aff634be 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -617,7 +617,7 @@ static struct kvm *kvm_create_vm(unsigned long type)
mutex_init(&kvm->lock);
mutex_init(&kvm->irq_lock);
mutex_init(&kvm->slots_lock);
- atomic_set(&kvm->users_count, 1);
+ refcount_set(&kvm->users_count, 1);
INIT_LIST_HEAD(&kvm->devices);
r = kvm_arch_init_vm(kvm, type);
@@ -747,13 +747,13 @@ static void kvm_destroy_vm(struct kvm *kvm)
void kvm_get_kvm(struct kvm *kvm)
{
- atomic_inc(&kvm->users_count);
+ refcount_inc(&kvm->users_count);
}
EXPORT_SYMBOL_GPL(kvm_get_kvm);
void kvm_put_kvm(struct kvm *kvm)
{
- if (atomic_dec_and_test(&kvm->users_count))
+ if (refcount_dec_and_test(&kvm->users_count))
kvm_destroy_vm(kvm);
}
EXPORT_SYMBOL_GPL(kvm_put_kvm);
@@ -3639,7 +3639,7 @@ static int kvm_debugfs_open(struct inode *inode, struct file *file,
* To avoid the race between open and the removal of the debugfs
* directory we test against the users count.
*/
- if (!atomic_add_unless(&stat_data->kvm->users_count, 1, 0))
+ if (!refcount_inc_not_zero(&stat_data->kvm->users_count))
return -ENOENT;
if (simple_attr_open(inode, file, get, set, fmt)) {