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| author | Pablo Neira Ayuso <pablo@netfilter.org> | 2024-04-08 23:18:33 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-04-13 13:05:22 +0200 |
| commit | 8d3a58af50e46167b6f1db47adadad03c0045dae (patch) | |
| tree | c00706b88e87484284f25649a3d30addacb973d6 | |
| parent | fcd1993a2937604d43ce134b9b9022cb76136610 (diff) | |
| download | linux-stable-8d3a58af50e46167b6f1db47adadad03c0045dae.tar.gz linux-stable-8d3a58af50e46167b6f1db47adadad03c0045dae.tar.bz2 linux-stable-8d3a58af50e46167b6f1db47adadad03c0045dae.zip | |
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: Sasha Levin <sashal@kernel.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 6b032a90e2b1..e7b31c2c92df 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -10077,11 +10077,6 @@ 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; } @@ -10098,6 +10093,14 @@ 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; |