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authorTimo Teräs <timo.teras@iki.fi>2010-07-12 21:29:42 +0000
committerDavid S. Miller <davem@davemloft.net>2010-07-14 14:16:48 -0700
commitd809ec895505e6f35fb1965f0946381ab4eaa474 (patch)
tree479a8937a4fd736ed5db9d87bb3ff81ee60f5cd5 /net
parentab83a38958ae7e419f18fabe9b2954a6087bfe0d (diff)
downloadlinux-2.6.34-ux500-d809ec895505e6f35fb1965f0946381ab4eaa474.tar.gz
xfrm: do not assume that template resolving always returns xfrms
xfrm_resolve_and_create_bundle() assumed that, if policies indicated presence of xfrms, bundle template resolution would always return some xfrms. This is not true for 'use' level policies which can result in no xfrm's being applied if there is no suitable xfrm states. This fixes a crash by this incorrect assumption. Reported-by: George Spelvin <linux@horizon.com> Bisected-by: George Spelvin <linux@horizon.com> Tested-by: George Spelvin <linux@horizon.com> Signed-off-by: Timo Teräs <timo.teras@iki.fi> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/xfrm/xfrm_policy.c15
1 files changed, 13 insertions, 2 deletions
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index af1c173be4a..a7ec5a8a238 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -1594,8 +1594,8 @@ xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols,
/* Try to instantiate a bundle */
err = xfrm_tmpl_resolve(pols, num_pols, fl, xfrm, family);
- if (err < 0) {
- if (err != -EAGAIN)
+ if (err <= 0) {
+ if (err != 0 && err != -EAGAIN)
XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
return ERR_PTR(err);
}
@@ -1678,6 +1678,13 @@ xfrm_bundle_lookup(struct net *net, struct flowi *fl, u16 family, u8 dir,
goto make_dummy_bundle;
dst_hold(&xdst->u.dst);
return oldflo;
+ } else if (new_xdst == NULL) {
+ num_xfrms = 0;
+ if (oldflo == NULL)
+ goto make_dummy_bundle;
+ xdst->num_xfrms = 0;
+ dst_hold(&xdst->u.dst);
+ return oldflo;
}
/* Kill the previous bundle */
@@ -1760,6 +1767,10 @@ restart:
xfrm_pols_put(pols, num_pols);
err = PTR_ERR(xdst);
goto dropdst;
+ } else if (xdst == NULL) {
+ num_xfrms = 0;
+ drop_pols = num_pols;
+ goto no_transform;
}
spin_lock_bh(&xfrm_policy_sk_bundle_lock);