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author | kib <kib@FreeBSD.org> | 2010-02-28 16:25:49 +0000 |
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committer | kib <kib@FreeBSD.org> | 2010-02-28 16:25:49 +0000 |
commit | f93a8fa5df25d78a9b746a05396cb56874e9115d (patch) | |
tree | ef34f9a348a27cb76f285b20cd1a1d67c07ffc33 /sys/net/if_tap.c | |
parent | 675be0dbc70bab58c8a57d7e399770557cb80a8d (diff) | |
download | FreeBSD-src-f93a8fa5df25d78a9b746a05396cb56874e9115d.zip FreeBSD-src-f93a8fa5df25d78a9b746a05396cb56874e9115d.tar.gz |
In both if_tun and if_tap:
Do not do additional dev_ref() on the newly created interface in the
if_clone create method [1]. This reference is not needed and never
removed, causing struct cdevpriv leakage. Remove the setting of
SI_CHEAPCLONE flag as well, since it is unused.
For dev_clone handlers, create cdevs with the call make_dev_credf(MAKEDEV_REF)
instead of calling make_dev() and then dev_ref(), to avoid a race.
Call drain_dev_clone_events() at the module unload time after dev_clone
handler is deinstalled.
Submitted by: Mikolaj Golub <to.my.trociny gmail com> [1]
MFC after: 1 week
Diffstat (limited to 'sys/net/if_tap.c')
-rw-r--r-- | sys/net/if_tap.c | 13 |
1 files changed, 3 insertions, 10 deletions
diff --git a/sys/net/if_tap.c b/sys/net/if_tap.c index 950e96c..93801f1 100644 --- a/sys/net/if_tap.c +++ b/sys/net/if_tap.c @@ -192,10 +192,6 @@ tap_clone_create(struct if_clone *ifc, int unit, caddr_t params) if (i) { dev = make_dev(&tap_cdevsw, unit | extra, UID_ROOT, GID_WHEEL, 0600, "%s%d", ifc->ifc_name, unit); - if (dev != NULL) { - dev_ref(dev); - dev->si_flags |= SI_CHEAPCLONE; - } } tapcreate(dev); @@ -300,6 +296,7 @@ tapmodevent(module_t mod, int type, void *data) EVENTHANDLER_DEREGISTER(dev_clone, eh_tag); if_clone_detach(&tap_cloner); if_clone_detach(&vmnet_cloner); + drain_dev_clone_events(); mtx_lock(&tapmtx); while ((tp = SLIST_FIRST(&taphead)) != NULL) { @@ -381,12 +378,8 @@ tapclone(void *arg, struct ucred *cred, char *name, int namelen, struct cdev **d name = devname; } - *dev = make_dev(&tap_cdevsw, unit | extra, - UID_ROOT, GID_WHEEL, 0600, "%s", name); - if (*dev != NULL) { - dev_ref(*dev); - (*dev)->si_flags |= SI_CHEAPCLONE; - } + *dev = make_dev_credf(MAKEDEV_REF, &tap_cdevsw, unit | extra, + cred, UID_ROOT, GID_WHEEL, 0600, "%s", name); } if_clone_create(name, namelen, NULL); |