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netfilter: nf_tables: disable toggling dormant table state more than once

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[ Upstream commit c9bd26513b3a11b3adb3c2ed8a31a01a87173ff1 ]

nft -f -<<EOF
add table ip t
add table ip t { flags dormant; }
add chain ip t c { type filter hook input priority 0; }
add table ip t
EOF

Triggers a splat from nf core on next table delete because we lose
track of right hook register state:

WARNING: CPU: 2 PID: 1597 at net/netfilter/core.c:501 __nf_unregister_net_hook
RIP: 0010:__nf_unregister_net_hook+0x41b/0x570
 nf_unregister_net_hook+0xb4/0xf0
 __nf_tables_unregister_hook+0x160/0x1d0
[..]

The above should have table in *active* state, but in fact no
hooks were registered.

Reject on/off/on games rather than attempting to fix this.

Fixes: 179d9ba555 ("netfilter: nf_tables: fix table flag updates")
Reported-by: "Lee, Cherie-Anne" <cherie.lee@starlabs.sg>
Cc: Bing-Jhong Billy Jheng <billy@starlabs.sg>
Cc: info@starlabs.sg
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Florian Westphal 2023-09-15 15:18:11 +02:00 committed by Greg Kroah-Hartman
parent 51fa66024a
commit c4b0facd5c
1 changed files with 4 additions and 0 deletions
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4
net/netfilter/nf_tables_api.c
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@ -1211,6 +1211,10 @@ static int nf_tables_updtable(struct nft_ctx *ctx)
flags & NFT_TABLE_F_OWNER))
return -EOPNOTSUPP;
/* No dormant off/on/off/on games in single transaction */
if (ctx->table->flags & __NFT_TABLE_F_UPDATE)
return -EINVAL;
trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
sizeof(struct nft_trans_table));
if (trans == NULL)