[PATCH 4.19 049/118] netfilter: nf_flow_table: fix missing error check for rhashtable_insert_fast

[Greg Kroah-Hartman]

[ Upstream commit 43c8f131184faf20c07221f3e09724611c6525d8 ]

rhashtable_insert_fast() may return an error value when memory
allocation fails, but flow_offload_add() does not check for errors.
This patch just adds missing error checking.

Fixes: ac2a66665e23 ("netfilter: add generic flow table infrastructure")
Signed-off-by: Taehee Yoo <ap420...@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pa...@netfilter.org>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 net/netfilter/nf_flow_table_core.c | 25 ++++++++++++++++++-------
 1 file changed, 18 insertions(+), 7 deletions(-)

diff --git a/net/netfilter/nf_flow_table_core.c 
b/net/netfilter/nf_flow_table_core.c
index e1537ace2b90..5df7486bb416 100644
--- a/net/netfilter/nf_flow_table_core.c
+++ b/net/netfilter/nf_flow_table_core.c
@@ -185,14 +185,25 @@ static const struct rhashtable_params 
nf_flow_offload_rhash_params = {
 
 int flow_offload_add(struct nf_flowtable *flow_table, struct flow_offload 
*flow)
 {
-       flow->timeout = (u32)jiffies;
+       int err;
 
-       rhashtable_insert_fast(&flow_table->rhashtable,
-                              &flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].node,
-                              nf_flow_offload_rhash_params);
-       rhashtable_insert_fast(&flow_table->rhashtable,
-                              &flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].node,
-                              nf_flow_offload_rhash_params);
+       err = rhashtable_insert_fast(&flow_table->rhashtable,
+                                    &flow->tuplehash[0].node,
+                                    nf_flow_offload_rhash_params);
+       if (err < 0)
+               return err;
+
+       err = rhashtable_insert_fast(&flow_table->rhashtable,
+                                    &flow->tuplehash[1].node,
+                                    nf_flow_offload_rhash_params);
+       if (err < 0) {
+               rhashtable_remove_fast(&flow_table->rhashtable,
+                                      &flow->tuplehash[0].node,
+                                      nf_flow_offload_rhash_params);
+               return err;
+       }
+
+       flow->timeout = (u32)jiffies;
        return 0;
 }
 EXPORT_SYMBOL_GPL(flow_offload_add);
-- 
2.20.1