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Plug some ifaddr refcount leaks.

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- Only take an ifaddr ref in in rt_exportinfo() if the caller explicitly
  requests it.  Take care to release it in this case.
- Don't unconditionally take a ref in rtrequest1_fib().  rt_getifa_fib()
  will acquire a reference, in which case we would previously acquire
  two references.
- Stop taking a reference in rtinit1() before calling rtrequest1_fib().
  rtrequest1_fib() will acquire a reference for the RTM_ADD case.

PR:		242746
Reviewed by:	melifaro (previous version)
Tested by:	ghuckriede@blackberry.com
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D22912
This commit is contained in:
Mark Johnston 2019-12-27 01:12:54 +00:00
parent afced35c1d
commit 6b5d8e30f1
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=356107
1 changed files with 9 additions and 8 deletions
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17
sys/net/route.c
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@ -833,7 +833,7 @@ rtrequest_fib(int req,
* to reflect size of the provided buffer. if no NHR_COPY is specified,
* point dst,netmask and gw @info fields to appropriate @rt values.
*
* if @flags contains NHR_REF, do refcouting on rt_ifp.
* if @flags contains NHR_REF, do refcouting on rt_ifp and rt_ifa.
*
* Returns 0 on success.
*/
@ -903,10 +903,9 @@ rt_exportinfo(struct rtentry *rt, struct rt_addrinfo *info, int flags)
info->rti_flags = rt->rt_flags;
info->rti_ifp = rt->rt_ifp;
info->rti_ifa = rt->rt_ifa;
ifa_ref(info->rti_ifa);
if (flags & NHR_REF) {
/* Do 'traditional' refcouting */
if_ref(info->rti_ifp);
ifa_ref(info->rti_ifa);
}
return (0);
@ -916,8 +915,8 @@ rt_exportinfo(struct rtentry *rt, struct rt_addrinfo *info, int flags)
* Lookups up route entry for @dst in RIB database for fib @fibnum.
* Exports entry data to @info using rt_exportinfo().
*
* if @flags contains NHR_REF, refcouting is performed on rt_ifp.
* All references can be released later by calling rib_free_info()
* If @flags contains NHR_REF, refcouting is performed on rt_ifp and rt_ifa.
* All references can be released later by calling rib_free_info().
*
* Returns 0 on success.
* Returns ENOENT for lookup failure, ENOMEM for export failure.
@ -963,6 +962,7 @@ void
rib_free_info(struct rt_addrinfo *info)
{
ifa_free(info->rti_ifa);
if_rele(info->rti_ifp);
}
@ -1631,9 +1631,12 @@ rtrequest1_fib(int req, struct rt_addrinfo *info, struct rtentry **ret_nrt,
error = rt_getifa_fib(info, fibnum);
if (error)
return (error);
} else {
ifa_ref(info->rti_ifa);
}
rt = uma_zalloc(V_rtzone, M_NOWAIT);
if (rt == NULL) {
ifa_free(info->rti_ifa);
return (ENOBUFS);
}
rt->rt_flags = RTF_UP | flags;
@ -1642,6 +1645,7 @@ rtrequest1_fib(int req, struct rt_addrinfo *info, struct rtentry **ret_nrt,
* Add the gateway. Possibly re-malloc-ing the storage for it.
*/
if ((error = rt_setgate(rt, dst, gateway)) != 0) {
ifa_free(info->rti_ifa);
uma_zfree(V_rtzone, rt);
return (error);
}
@ -1665,7 +1669,6 @@ rtrequest1_fib(int req, struct rt_addrinfo *info, struct rtentry **ret_nrt,
* examine the ifa and ifa->ifa_ifp if it so desires.
*/
ifa = info->rti_ifa;
ifa_ref(ifa);
rt->rt_ifa = ifa;
rt->rt_ifp = ifa->ifa_ifp;
rt->rt_weight = 1;
@ -2108,7 +2111,6 @@ rtinit1(struct ifaddr *ifa, int cmd, int flags, int fibnum)
* Do the actual request
*/
bzero((caddr_t)&info, sizeof(info));
ifa_ref(ifa);
info.rti_ifa = ifa;
info.rti_flags = flags |
(ifa->ifa_flags & ~IFA_RTSELF) | RTF_PINNED;
@ -2122,7 +2124,6 @@ rtinit1(struct ifaddr *ifa, int cmd, int flags, int fibnum)
info.rti_info[RTAX_GATEWAY] = ifa->ifa_addr;
info.rti_info[RTAX_NETMASK] = netmask;
error = rtrequest1_fib(cmd, &info, &rt, fibnum);
if (error == 0 && rt != NULL) {
/*
* notify any listening routing agents of the change