[PATCH RFC ipsec] xfrm: Fix crash when the hold queue is used.

[Steffen Klassert]

The commits "xfrm: Move dst->path into struct xfrm_dst"
and "net: Create and use new helper xfrm_dst_child()."
changed xfrm bundle handling under the assumption
that xdst->path and dst->child are not a NULL pointer
only if dst->xfrm is not a NULL pointer. That is true
with one exception. If the xfrm hold queue is used
to wait until a SA is installed by the key manager,
we create a dummy bundle without a valid dst->xfrm
pointer. The current xfrm bundle handling crashes
in that case. Fix this by extending the NULL check
of dst->xfrm with a test of the DST_XFRM_QUEUE flag.

Fixes: 0f6c480f23f4 ("xfrm: Move dst->path into struct xfrm_dst")
Fixes: b92cf4aab8e6 ("net: Create and use new helper xfrm_dst_child().")
Signed-off-by: Steffen Klassert <steffen.klass...@secunet.com>
---
 include/net/xfrm.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index 5c20953c8deb..51f65d23ebaf 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -941,7 +941,7 @@ struct xfrm_dst {
 static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst)
 {
 #ifdef CONFIG_XFRM
-       if (dst->xfrm) {
+       if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
                const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst;
 
                return xdst->path;
@@ -953,7 +953,7 @@ static inline struct dst_entry *xfrm_dst_path(const struct 
dst_entry *dst)
 static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst)
 {
 #ifdef CONFIG_XFRM
-       if (dst->xfrm) {
+       if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) {
                struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
                return xdst->child;
        }
-- 
2.17.1