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Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

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Pull misc fixes from Al Viro:
 "vhost race fix and a percpu_ref_init-caused cgroup double-free fix.

  The latter had manifested as buggered struct mount refcounting - those
  are also using percpu data structures, but anything that does percpu
  allocations could be hit"

* 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  Fix double fget() in vhost_net_set_backend()
  percpu_ref_init(): clean ->percpu_count_ref on failure
This commit is contained in:
Linus Torvalds 2022-05-18 14:02:25 -10:00
commit dbd380bbff
2 changed files with 8 additions and 8 deletions
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15
drivers/vhost/net.c
View file

@ -1450,13 +1450,9 @@ static struct socket *get_raw_socket(int fd)
return ERR_PTR(r);
}
static struct ptr_ring *get_tap_ptr_ring(int fd)
static struct ptr_ring *get_tap_ptr_ring(struct file *file)
{
struct ptr_ring *ring;
struct file *file = fget(fd);
if (!file)
return NULL;
ring = tun_get_tx_ring(file);
if (!IS_ERR(ring))
goto out;
@ -1465,7 +1461,6 @@ static struct ptr_ring *get_tap_ptr_ring(int fd)
goto out;
ring = NULL;
out:
fput(file);
return ring;
}
@ -1552,8 +1547,12 @@ static long vhost_net_set_backend(struct vhost_net *n, unsigned index, int fd)
r = vhost_net_enable_vq(n, vq);
if (r)
goto err_used;
if (index == VHOST_NET_VQ_RX)
nvq->rx_ring = get_tap_ptr_ring(fd);
if (index == VHOST_NET_VQ_RX) {
if (sock)
nvq->rx_ring = get_tap_ptr_ring(sock->file);
else
nvq->rx_ring = NULL;
}
oldubufs = nvq->ubufs;
nvq->ubufs = ubufs;

1
lib/percpu-refcount.c
View file

@ -76,6 +76,7 @@ int percpu_ref_init(struct percpu_ref *ref, percpu_ref_func_t *release,
data = kzalloc(sizeof(*ref->data), gfp);
if (!data) {
free_percpu((void __percpu *)ref->percpu_count_ptr);
ref->percpu_count_ptr = 0;
return -ENOMEM;
}