net: fix use-after-free in the netdev_nl_sock_priv_destroy()

In the netdev_nl_sock_priv_destroy(), an instance lock is acquired
before calling net_devmem_unbind_dmabuf(), then releasing an instance
lock(netdev_unlock(binding->dev)).
However, a binding is freed in the net_devmem_unbind_dmabuf().
So using a binding after net_devmem_unbind_dmabuf() occurs UAF.
To fix this UAF, it needs to use temporary variable.

Fixes: ba6f418fbf64 ("net: bubble up taking netdev instance lock to callers of net_devmem_unbind_dmabuf()")
Signed-off-by: Taehee Yoo <[email protected]>
Reviewed-by: Jakub Kicinski <[email protected]>
Reviewed-by: Mina Almasry <[email protected]>
Reviewed-by: Xuan Zhuo <[email protected]>
Reviewed-by: Simon Horman <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

0 files changed, 0 insertions, 0 deletions