linux-stable/drivers/vhost
Al Viro d759015c9b Fix double fget() in vhost_net_set_backend()
commit fb4554c223 upstream.

Descriptor table is a shared resource; two fget() on the same descriptor
may return different struct file references.  get_tap_ptr_ring() is
called after we'd found (and pinned) the socket we'll be using and it
tries to find the private tun/tap data structures associated with it.
Redoing the lookup by the same file descriptor we'd used to get the
socket is racy - we need to same struct file.

Thanks to Jason for spotting a braino in the original variant of patch -
I'd missed the use of fd == -1 for disabling backend, and in that case
we can end up with sock == NULL and sock != oldsock.

Cc: stable@kernel.org
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-05-25 09:59:03 +02:00
..
iotlb.c vhost: handle error while adding split ranges to iotlb 2022-04-08 13:58:58 +02:00
Kconfig vhost_vdpa: implement IRQ offloading in vhost_vdpa 2020-08-05 11:08:42 -04:00
Makefile vhost: introduce vDPA-based backend 2020-04-02 10:41:40 -04:00
net.c Fix double fget() in vhost_net_set_backend() 2022-05-25 09:59:03 +02:00
scsi.c vhost scsi: Convert to SPDX identifier 2021-09-05 16:23:08 -04:00
test.c vhost/test: fix memory leak of vhost virtqueues 2022-01-14 18:50:53 -05:00
test.h tools/virtio: Add --reset 2020-06-22 12:34:21 -04:00
vdpa.c vhost_vdpa: don't setup irq offloading when irq_num < 0 2022-05-25 09:59:00 +02:00
vhost.c vhost: allow batching hint without size 2022-03-10 08:12:04 -05:00
vhost.h vhost: fix up vhost_work coding style 2021-07-03 04:50:55 -04:00
vringh.c vringh: Use wiov->used to check for read/write desc order 2021-08-11 06:44:24 -04:00
vsock.c vsock: each transport cycles only on its own sockets 2022-03-11 23:14:19 -08:00