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| author | Pablo Neira Ayuso <pablo@netfilter.org> | 2024-04-08 23:21:40 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-04-13 12:51:39 +0200 |
| commit | 0a14e162393ddbf0949e9ab65536964b38c2d34d (patch) | |
| tree | c1c851a4f138fe8a715c33d3e8107c042dc2f7a4 | |
| parent | 41bad13c0e8a5a2b47a7472cced922555372daab (diff) | |
| download | linux-stable-0a14e162393ddbf0949e9ab65536964b38c2d34d.tar.gz linux-stable-0a14e162393ddbf0949e9ab65536964b38c2d34d.tar.bz2 linux-stable-0a14e162393ddbf0949e9ab65536964b38c2d34d.zip | |
netfilter: nf_tables: release batch on table validation from abort path
commit a45e6889575c2067d3c0212b6bc1022891e65b91 upstream.
Unlike early commit path stage which triggers a call to abort, an
explicit release of the batch is required on abort, otherwise mutex is
released and commit_list remains in place.
Add WARN_ON_ONCE to ensure commit_list is empty from the abort path
before releasing the mutex.
After this patch, commit_list is always assumed to be empty before
grabbing the mutex, therefore
03c1f1ef1584 ("netfilter: Cleanup nft_net->module_list from nf_tables_exit_net()")
only needs to release the pending modules for registration.
Cc: stable@vger.kernel.org
Fixes: c0391b6ab810 ("netfilter: nf_tables: missing validation from the abort path")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | net/netfilter/nf_tables_api.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c index f4821d64c2fd..b719f3517caf 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -7564,10 +7564,11 @@ static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action) struct nftables_pernet *nft_net = net_generic(net, nf_tables_net_id); struct nft_trans *trans, *next; struct nft_trans_elem *te; + int err = 0; if (action == NFNL_ABORT_VALIDATE && nf_tables_validate(net) < 0) - return -EAGAIN; + err = -EAGAIN; list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list, list) { @@ -7700,7 +7701,7 @@ static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action) else nf_tables_module_autoload_cleanup(net); - return 0; + return err; } static int nf_tables_abort(struct net *net, struct sk_buff *skb, @@ -7714,6 +7715,8 @@ static int nf_tables_abort(struct net *net, struct sk_buff *skb, ret = __nf_tables_abort(net, action); nft_gc_seq_end(nft_net, gc_seq); + WARN_ON_ONCE(!list_empty(&nft_net->commit_list)); + mutex_unlock(&nft_net->commit_mutex); return ret; @@ -8400,8 +8403,11 @@ static void __net_exit nf_tables_exit_net(struct net *net) gc_seq = nft_gc_seq_begin(nft_net); - if (!list_empty(&nft_net->commit_list)) - __nf_tables_abort(net, NFNL_ABORT_NONE); + WARN_ON_ONCE(!list_empty(&nft_net->commit_list)); + + if (!list_empty(&nft_net->module_list)) + nf_tables_module_autoload_cleanup(net); + __nft_release_tables(net); nft_gc_seq_end(nft_net, gc_seq); |