linux

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Al Viro ec0d801d1a Fix double fget() in vhost_net_set_backend()

commit fb4554c2232e44d595920f4d5c66cf8f7d13f9bc 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 09:17:55 +02:00

iotlb.c

vhost: Fix documentation

2020-09-24 05:54:36 -04:00

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()