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xfrm: release dst_orig in case of error in xfrm_lookup()

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dst_orig should be released on error. Function like __xfrm_route_forward()
expects that behavior.
Since a recent commit, xfrm_lookup() may also be called by xfrm_lookup_route(),
which expects the opposite.
Let's introduce a new flag (XFRM_LOOKUP_KEEP_DST_REF) to tell what should be
done in case of error.

Fixes: f92ee61982d("xfrm: Generate blackhole routes only from route lookup functions")
Signed-off-by: huaibin Wang <huaibin.wang@6wind.com>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
huaibin Wang 2015-02-11 18:10:36 +01:00 committed by Steffen Klassert
parent 044a832a77
commit ac37e2515c
2 changed files with 7 additions and 6 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

1
include/net/dst.h
View file

@ -481,6 +481,7 @@ void dst_init(void);
enum {
XFRM_LOOKUP_ICMP = 1 << 0,
XFRM_LOOKUP_QUEUE = 1 << 1,
XFRM_LOOKUP_KEEP_DST_REF = 1 << 2,
};
struct flowi;

12
net/xfrm/xfrm_policy.c
View file

@ -2269,11 +2269,9 @@ struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig,
* have the xfrm_state's. We need to wait for KM to
* negotiate new SA's or bail out with error.*/
if (net->xfrm.sysctl_larval_drop) {
dst_release(dst);
xfrm_pols_put(pols, drop_pols);
XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
return ERR_PTR(-EREMOTE);
err = -EREMOTE;
goto error;
}
err = -EAGAIN;
@ -2324,7 +2322,8 @@ struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig,
error:
dst_release(dst);
dropdst:
dst_release(dst_orig);
if (!(flags & XFRM_LOOKUP_KEEP_DST_REF))
dst_release(dst_orig);
xfrm_pols_put(pols, drop_pols);
return ERR_PTR(err);
}
@ -2338,7 +2337,8 @@ struct dst_entry *xfrm_lookup_route(struct net *net, struct dst_entry *dst_orig,
struct sock *sk, int flags)
{
struct dst_entry *dst = xfrm_lookup(net, dst_orig, fl, sk,
flags | XFRM_LOOKUP_QUEUE);
flags | XFRM_LOOKUP_QUEUE |
XFRM_LOOKUP_KEEP_DST_REF);
if (IS_ERR(dst) && PTR_ERR(dst) == -EREMOTE)
return make_blackhole(net, dst_orig->ops->family, dst_orig);