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bridge_delete_member is called via the event handler from if_detach

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after the LLADDR is reclaimed which causes a null pointer deref with
inherit_mac enabled. Record the ifnet pointer of the interface and then compare
that to find when to re-assign the bridge address.

Submitted by:	sam
This commit is contained in:
Andrew Thompson 2009-02-13 19:20:25 +00:00
parent a1797ef6c8
commit 66c84010b4
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=188594
1 changed files with 9 additions and 5 deletions
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14
sys/net/if_bridge.c
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@ -220,6 +220,7 @@ struct bridge_softc {
LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */
struct bstp_state sc_stp; /* STP state */
uint32_t sc_brtexceeded; /* # of cache drops */
struct ifnet *sc_ifaddr; /* member mac copied from */
u_char sc_defaddr[6]; /* Default MAC address */
};
@ -930,15 +931,16 @@ bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif,
* the mac address of the bridge to the address of the next member, or
* to its default address if no members are left.
*/
if (bridge_inherit_mac &&
!memcmp(IF_LLADDR(sc->sc_ifp), IF_LLADDR(ifs), ETHER_ADDR_LEN)) {
if (LIST_EMPTY(&sc->sc_iflist))
if (bridge_inherit_mac && sc->sc_ifaddr == ifs) {
if (LIST_EMPTY(&sc->sc_iflist)) {
bcopy(sc->sc_defaddr,
IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
else {
sc->sc_ifaddr = NULL;
} else {
fif = LIST_FIRST(&sc->sc_iflist)->bif_ifp;
bcopy(IF_LLADDR(fif),
IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
sc->sc_ifaddr = fif;
}
}
@ -1039,8 +1041,10 @@ bridge_ioctl_add(struct bridge_softc *sc, void *arg)
* the default randomly generated one.
*/
if (bridge_inherit_mac && LIST_EMPTY(&sc->sc_iflist) &&
!memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr, ETHER_ADDR_LEN))
!memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr, ETHER_ADDR_LEN)) {
bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
sc->sc_ifaddr = ifs;
}
ifs->if_bridge = sc;
bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp);