• Kristof Provost's avatar
    dummynet: fix ip_dn_vnet_init() / dummynet_task() race · cbb019b8
    Kristof Provost authored
    If dummynet_task() is run on a vnet where dummynet is still initialising
    (i.e. still running ip_dn_vnet_init()) we can attempt to use an
    uninitialised mutex.
    
    We can use the existing init_done field to check if the per-vnet
    V_dn_cfg is fully set up, if we ensure that it's only set to 1 when
    we've done all of the init work.
    
    Reported by:	Alfredo Dal'Ava Júnior <alfredo@freebsd.org>
    Sponsored by:	Rubicon Communications, LLC ("Netgate")
    Differential Revision:	https://reviews.freebsd.org/D35716
    cbb019b8