git: 27f1ec0be24b - main - tun/tap: correct ref count on cloned cdevs

[Konstantin Belousov]

The branch main has been updated by kib:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=27f1ec0be24b45559793e486a4fa5a2e7fdadc17

commit 27f1ec0be24b45559793e486a4fa5a2e7fdadc17
Author:     Konstantin Belousov <k...@freebsd.org>
AuthorDate: 2023-09-21 10:47:14 +0000
Commit:     Konstantin Belousov <k...@freebsd.org>
CommitDate: 2023-10-09 23:36:59 +0000

    tun/tap: correct ref count on cloned cdevs
    
    Reported and tested by: eugen
    PR:     273418
    Discussed with: jah, kevans
    Sponsored by:   The FreeBSD Foundation
    MFC after:      1 week
    Differential revision:  https://reviews.freebsd.org/D42008
---
 sys/net/if_tuntap.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/sys/net/if_tuntap.c b/sys/net/if_tuntap.c
index f4dbf685fba6..a01bc11aa64c 100644
--- a/sys/net/if_tuntap.c
+++ b/sys/net/if_tuntap.c
@@ -548,6 +548,7 @@ tun_clone_create(struct if_clone *ifc, char *name, size_t 
len,
        if (i != 0)
                i = tun_create_device(drv, unit, NULL, &dev, name);
        if (i == 0) {
+               dev_ref(dev);
                tuncreate(dev);
                struct tuntap_softc *tp = dev->si_drv1;
                *ifpp = tp->tun_ifp;
@@ -611,8 +612,10 @@ tunclone(void *arg, struct ucred *cred, char *name, int 
namelen,
 
                i = tun_create_device(drv, u, cred, dev, name);
        }
-       if (i == 0)
+       if (i == 0) {
+               dev_ref(*dev);
                if_clone_create(name, namelen, NULL);
+       }
 out:
        CURVNET_RESTORE();
 }