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authorJulian Anastasov <ja@ssi.bg>2005-09-09 00:34:47 +0400
committerDavid S. Miller <davem@davemloft.net>2005-09-09 00:34:47 +0400
commitce723d8e048ef98ea64d12379e3921c933f5b3e0 (patch)
tree368e85ac0014d203bba15bb8777ffbd94dc2d2e6 /net
parentc921e4c4dbb043f9435414c4e661e7f0a783053d (diff)
downloadlinux-ce723d8e048ef98ea64d12379e3921c933f5b3e0.tar.xz
[IPV4]: Fix refcount damaging in net/ipv4/route.c
One such place that can damage the dst refcnts is route.c with CONFIG_IP_ROUTE_MULTIPATH_CACHED enabled, i don't see the user's .config. In this new code i see that rt_intern_hash is called before dst->refcnt is set to 1, dst is the 2nd arg to rt_intern_hash. Arg 2 of rt_intern_hash must come with refcnt 1 as it is added to table or dropped depending on error/add/update. One such example is ip_mkroute_input where __mkroute_input return rth with refcnt 0 which is provided to rt_intern_hash. ip_mkroute_output looks like a 2nd such place. Appending untested patch for comments and review. The idea is to put previous reference as we are going to return next result/error. Signed-off-by: Julian Anastasov <ja@ssi.bg> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv4/route.c29
1 files changed, 14 insertions, 15 deletions
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 8c0b14e3beec..8549f26e2495 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1760,6 +1760,7 @@ static inline int __mkroute_input(struct sk_buff *skb,
goto cleanup;
}
+ atomic_set(&rth->u.dst.__refcnt, 1);
rth->u.dst.flags= DST_HOST;
#ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED
if (res->fi->fib_nhs > 1)
@@ -1820,7 +1821,6 @@ static inline int ip_mkroute_input_def(struct sk_buff *skb,
err = __mkroute_input(skb, res, in_dev, daddr, saddr, tos, &rth);
if (err)
return err;
- atomic_set(&rth->u.dst.__refcnt, 1);
/* put it into the cache */
hash = rt_hash_code(daddr, saddr ^ (fl->iif << 5), tos);
@@ -1834,8 +1834,8 @@ static inline int ip_mkroute_input(struct sk_buff *skb,
u32 daddr, u32 saddr, u32 tos)
{
#ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED
- struct rtable* rth = NULL;
- unsigned char hop, hopcount, lasthop;
+ struct rtable* rth = NULL, *rtres;
+ unsigned char hop, hopcount;
int err = -EINVAL;
unsigned int hash;
@@ -1844,8 +1844,6 @@ static inline int ip_mkroute_input(struct sk_buff *skb,
else
hopcount = 1;
- lasthop = hopcount - 1;
-
/* distinguish between multipath and singlepath */
if (hopcount < 2)
return ip_mkroute_input_def(skb, res, fl, in_dev, daddr,
@@ -1855,6 +1853,10 @@ static inline int ip_mkroute_input(struct sk_buff *skb,
for (hop = 0; hop < hopcount; hop++) {
res->nh_sel = hop;
+ /* put reference to previous result */
+ if (hop)
+ ip_rt_put(rtres);
+
/* create a routing cache entry */
err = __mkroute_input(skb, res, in_dev, daddr, saddr, tos,
&rth);
@@ -1863,7 +1865,7 @@ static inline int ip_mkroute_input(struct sk_buff *skb,
/* put it into the cache */
hash = rt_hash_code(daddr, saddr ^ (fl->iif << 5), tos);
- err = rt_intern_hash(hash, rth, (struct rtable**)&skb->dst);
+ err = rt_intern_hash(hash, rth, &rtres);
if (err)
return err;
@@ -1873,13 +1875,8 @@ static inline int ip_mkroute_input(struct sk_buff *skb,
FIB_RES_NETMASK(*res),
res->prefixlen,
&FIB_RES_NH(*res));
-
- /* only for the last hop the reference count is handled
- * outside
- */
- if (hop == lasthop)
- atomic_set(&(skb->dst->__refcnt), 1);
}
+ skb->dst = &rtres->u.dst;
return err;
#else /* CONFIG_IP_ROUTE_MULTIPATH_CACHED */
return ip_mkroute_input_def(skb, res, fl, in_dev, daddr, saddr, tos);
@@ -2208,6 +2205,7 @@ static inline int __mkroute_output(struct rtable **result,
goto cleanup;
}
+ atomic_set(&rth->u.dst.__refcnt, 1);
rth->u.dst.flags= DST_HOST;
#ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED
if (res->fi) {
@@ -2290,8 +2288,6 @@ static inline int ip_mkroute_output_def(struct rtable **rp,
if (err == 0) {
u32 tos = RT_FL_TOS(oldflp);
- atomic_set(&rth->u.dst.__refcnt, 1);
-
hash = rt_hash_code(oldflp->fl4_dst,
oldflp->fl4_src ^ (oldflp->oif << 5), tos);
err = rt_intern_hash(hash, rth, rp);
@@ -2326,6 +2322,10 @@ static inline int ip_mkroute_output(struct rtable** rp,
dev2nexthop = FIB_RES_DEV(*res);
dev_hold(dev2nexthop);
+ /* put reference to previous result */
+ if (hop)
+ ip_rt_put(*rp);
+
err = __mkroute_output(&rth, res, fl, oldflp,
dev2nexthop, flags);
@@ -2350,7 +2350,6 @@ static inline int ip_mkroute_output(struct rtable** rp,
if (err != 0)
return err;
}
- atomic_set(&(*rp)->u.dst.__refcnt, 1);
return err;
} else {
return ip_mkroute_output_def(rp, res, fl, oldflp, dev_out,