netfilter: nf_tables_offload: release flow_rule on error from commit path

If hardware offload commit path fails, release all flow_rule objects.

Fixes: c9626a2 ("netfilter: nf_tables: add hardware offload support")
Signed-off-by: Pablo Neira Ayuso <[email protected]>

Author: ummakynes

net/netfilter/nf_tables_offload.c

@@ -422,14 +422,14 @@ int nft_flow_rule_offload_commit(struct net *net)
 				continue;
 
 			if (trans->ctx.flags & NLM_F_REPLACE ||
-			    !(trans->ctx.flags & NLM_F_APPEND))
-				return -EOPNOTSUPP;
-
+			    !(trans->ctx.flags & NLM_F_APPEND)) {
+				err = -EOPNOTSUPP;
+				break;
+			}
 			err = nft_flow_offload_rule(trans->ctx.chain,
 						    nft_trans_rule(trans),
 						    nft_trans_flow_rule(trans),
 						    FLOW_CLS_REPLACE);
-			nft_flow_rule_destroy(nft_trans_flow_rule(trans));
 			break;
 		case NFT_MSG_DELRULE:
 			if (!(trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD))
@@ -442,7 +442,23 @@ int nft_flow_rule_offload_commit(struct net *net)
 		}
 
 		if (err)
-			return err;
+			break;
+	}
+
+	list_for_each_entry(trans, &net->nft.commit_list, list) {
+		if (trans->ctx.family != NFPROTO_NETDEV)
+			continue;
+
+		switch (trans->msg_type) {
+		case NFT_MSG_NEWRULE:
+			if (!(trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD))
+				continue;
+
+			nft_flow_rule_destroy(nft_trans_flow_rule(trans));
+			break;
+		default:
+			break;
+		}
 	}
 
 	return err;