[PATCH nf] netfilter: nf_tables: fix possible null-pointer dereference in object update

[Fernando Fernandez Mancera]

Fixes: d62d0ba97b58 ("netfilter: nf_tables: Introduce stateful object update 
operation")
Signed-off-by: Fernando Fernandez Mancera <ffmanc...@riseup.net>
---
 net/netfilter/nf_tables_api.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index cf767bc58e18..6893de9e1389 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -6477,7 +6477,8 @@ static void nft_obj_commit_update(struct nft_trans *trans)
        obj = nft_trans_obj(trans);
        newobj = nft_trans_obj_newobj(trans);
 
-       obj->ops->update(obj, newobj);
+       if (obj->ops->update)
+               obj->ops->update(obj, newobj);
 
        kfree(newobj);
 }
-- 
2.20.1