[PATCH 4.9 021/172] decnet: always not take dst->__refcnt when inserting dst into hash table

From: Greg Kroah-Hartman
Date: Mon Jul 03 2017 - 10:45:29 EST

4.9-stable review patch. If anyone has any objections, please let me know.


From: Wei Wang <weiwan@xxxxxxxxxx>

[ Upstream commit 76371d2e3ad1f84426a30ebcd8c3b9b98f4c724f ]

In the existing dn_route.c code, dn_route_output_slow() takes
dst->__refcnt before calling dn_insert_route() while dn_route_input_slow()
does not take dst->__refcnt before calling dn_insert_route().
This makes the whole routing code very buggy.
In dn_dst_check_expire(), dnrt_free() is called when rt expires. This
makes the routes inserted by dn_route_output_slow() not able to be
freed as the refcnt is not released.
In dn_dst_gc(), dnrt_drop() is called to release rt which could
potentially cause the dst->__refcnt to be dropped to -1.
In dn_run_flush(), dst_free() is called to release all the dst. Again,
it makes the dst inserted by dn_route_output_slow() not able to be
released and also, it does not wait on the rcu and could potentially
cause crash in the path where other users still refer to this dst.

This patch makes sure both input and output path do not take
dst->__refcnt before calling dn_insert_route() and also makes sure
dnrt_free()/dst_free() is called when removing dst from the hash table.
The only difference between those 2 calls is that dnrt_free() waits on
the rcu while dst_free() does not.

Signed-off-by: Wei Wang <weiwan@xxxxxxxxxx>
Acked-by: Martin KaFai Lau <kafai@xxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
net/decnet/dn_route.c | 14 ++++----------
1 file changed, 4 insertions(+), 10 deletions(-)

--- a/net/decnet/dn_route.c
+++ b/net/decnet/dn_route.c
@@ -188,12 +188,6 @@ static inline void dnrt_free(struct dn_r
call_rcu_bh(&rt->dst.rcu_head, dst_rcu_free);

-static inline void dnrt_drop(struct dn_route *rt)
- dst_release(&rt->dst);
- call_rcu_bh(&rt->dst.rcu_head, dst_rcu_free);
static void dn_dst_check_expire(unsigned long dummy)
int i;
@@ -248,7 +242,7 @@ static int dn_dst_gc(struct dst_ops *ops
*rtp = rt->dst.dn_next;
rt->dst.dn_next = NULL;
- dnrt_drop(rt);
+ dnrt_free(rt);
@@ -350,7 +344,7 @@ static int dn_insert_route(struct dn_rou
dst_use(&rth->dst, now);

- dnrt_drop(rt);
+ dst_free(&rt->dst);
*rp = rth;
return 0;
@@ -380,7 +374,7 @@ static void dn_run_flush(unsigned long d
for(; rt; rt = next) {
next = rcu_dereference_raw(rt->dst.dn_next);
RCU_INIT_POINTER(rt->dst.dn_next, NULL);
- dst_free((struct dst_entry *)rt);
+ dnrt_free(rt);

@@ -1187,7 +1181,7 @@ make_route:
if (dev_out->flags & IFF_LOOPBACK)
flags |= RTCF_LOCAL;

- rt = dst_alloc(&dn_dst_ops, dev_out, 1, DST_OBSOLETE_NONE, DST_HOST);
+ rt = dst_alloc(&dn_dst_ops, dev_out, 0, DST_OBSOLETE_NONE, DST_HOST);
if (rt == NULL)
goto e_nobufs;