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After tearing down the interface per-"domain" bits, set the data area

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to NULL to avoid it being mis-treated on a possible re-attach but also
to get a clean NULL pointer derefence in case of errors due to
unexpected race conditions elsewhere in the code, e.g., callouts.

Obtained from:	projects/vnet
MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation
This commit is contained in:
Bjoern A. Zeeb 2016-06-06 22:59:58 +00:00
parent c152ba971f
commit 2d5ad99a0d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=301533
1 changed files with 3 additions and 1 deletions
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4
sys/net/if.c
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@ -1030,9 +1030,11 @@ if_detach_internal(struct ifnet *ifp, int vmove, struct if_clone **ifcp)
ifp->if_afdata_initialized = 0;
IF_AFDATA_UNLOCK(ifp);
for (dp = domains; i > 0 && dp; dp = dp->dom_next) {
if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family])
if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family]) {
(*dp->dom_ifdetach)(ifp,
ifp->if_afdata[dp->dom_family]);
ifp->if_afdata[dp->dom_family] = NULL;
}
}
return (0);