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netfilter: nf_tables: Fix a memory leak in nf_tables_updchain

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If nft_netdev_register_hooks() fails, the memory associated with
nft_stats is not freed, causing a memory leak.

This patch fixes it by moving nft_stats_alloc() down after
nft_netdev_register_hooks() succeeds.

Fixes: b9703ed44f ("netfilter: nf_tables: support for adding new devices to an existing netdev chain")
Signed-off-by: Quan Tian <tianquan23@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Quan Tian 2024-03-07 01:24:02 +08:00 committed by Pablo Neira Ayuso
parent 4a0e7f2dec
commit 7eaf837a4e
1 changed files with 14 additions and 13 deletions
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27
net/netfilter/nf_tables_api.c
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@ -2631,19 +2631,6 @@ static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
}
}
if (nla[NFTA_CHAIN_COUNTERS]) {
if (!nft_is_base_chain(chain)) {
err = -EOPNOTSUPP;
goto err_hooks;
}
stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
if (IS_ERR(stats)) {
err = PTR_ERR(stats);
goto err_hooks;
}
}
if (!(table->flags & NFT_TABLE_F_DORMANT) &&
nft_is_base_chain(chain) &&
!list_empty(&hook.list)) {
@ -2658,6 +2645,20 @@ static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
}
unregister = true;
if (nla[NFTA_CHAIN_COUNTERS]) {
if (!nft_is_base_chain(chain)) {
err = -EOPNOTSUPP;
goto err_hooks;
}
stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
if (IS_ERR(stats)) {
err = PTR_ERR(stats);
goto err_hooks;
}
}
err = -ENOMEM;
trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
sizeof(struct nft_trans_chain));