https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=273418
--- Comment #40 from Konstantin Belousov <k...@freebsd.org> ---
commit 508e5f7d8d852b0f24cf0200d4486997d5d09409
Author: Konstantin Belousov <k...@freebsd.org>
Date: Thu Sep 21 13:47:14 2023 +0300
tun/tap: correct ref count on cloned cdevs
PR: 273418
(cherry picked from commit 07fda41d2a2df0d0d422f30a8a2353de5f0d9c3e)
diff --git a/sys/net/if_tuntap.c b/sys/net/if_tuntap.c
index b81c2149a62f..756aa04482cb 100644
--- a/sys/net/if_tuntap.c
+++ b/sys/net/if_tuntap.c
@@ -541,6 +541,8 @@ tun_clone_create(struct if_clone *ifc, char *name, size_t
len, caddr_t params)
/* find any existing device, or allocate new unit number */
dev = NULL;
i = clone_create(&drv->clones, &drv->cdevsw, &unit, &dev, 0);
+ if (i == 0)
+ dev_ref(dev);
/* No preexisting struct cdev *, create one */
if (i != 0)
i = tun_create_device(drv, unit, NULL, &dev, name);
@@ -596,6 +598,8 @@ tunclone(void *arg, struct ucred *cred, char *name, int
namelen,
/* find any existing device, or allocate new unit number */
i = clone_create(&drv->clones, &drv->cdevsw, &u, dev, 0);
+ if (i == 0)
+ dev_ref(*dev);
if (i) {
if (append_unit) {
namelen = snprintf(devname, sizeof(devname), "%s%d",
--
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