diff options
| author | Pablo Neira Ayuso <pablo@netfilter.org> | 2024-03-28 16:23:55 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-04-10 17:38:02 +0300 |
| commit | a34ba4bdeec0c3b629160497594908dc820110f1 (patch) | |
| tree | 2243a816bb2897883a169a3bce2b22f25cbb7bd1 | |
| parent | 258d46ab994c711a8bd3087347d46d47015855b9 (diff) | |
| download | linux-a34ba4bdeec0c3b629160497594908dc820110f1.tar.xz | |
netfilter: nf_tables: release mutex after nft_gc_seq_end from abort path
commit 0d459e2ffb541841714839e8228b845458ed3b27 upstream.
The commit mutex should not be released during the critical section
between nft_gc_seq_begin() and nft_gc_seq_end(), otherwise, async GC
worker could collect expired objects and get the released commit lock
within the same GC sequence.
nf_tables_module_autoload() temporarily releases the mutex to load
module dependencies, then it goes back to replay the transaction again.
Move it at the end of the abort phase after nft_gc_seq_end() is called.
Cc: stable@vger.kernel.org
Fixes: 720344340fb9 ("netfilter: nf_tables: GC transaction race with abort path")
Reported-by: Kuan-Ting Chen <hexrabbit@devco.re>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | net/netfilter/nf_tables_api.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c index 76e90297180f..90637075c960 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -10643,11 +10643,6 @@ static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action) nf_tables_abort_release(trans); } - if (action == NFNL_ABORT_AUTOLOAD) - nf_tables_module_autoload(net); - else - nf_tables_module_autoload_cleanup(net); - return err; } @@ -10664,6 +10659,14 @@ static int nf_tables_abort(struct net *net, struct sk_buff *skb, WARN_ON_ONCE(!list_empty(&nft_net->commit_list)); + /* module autoload needs to happen after GC sequence update because it + * temporarily releases and grabs mutex again. + */ + if (action == NFNL_ABORT_AUTOLOAD) + nf_tables_module_autoload(net); + else + nf_tables_module_autoload_cleanup(net); + mutex_unlock(&nft_net->commit_mutex); return ret; |