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authorPablo Neira Ayuso <pablo@netfilter.org>2024-01-29 11:09:43 +0100
committerPablo Neira Ayuso <pablo@netfilter.org>2024-01-31 23:14:13 +0100
commit259eb32971e9eb24d1777a28d82730659f50fdcb (patch)
tree998bf436191ed6a60d459e70621e508e8ae338be /net
parent97f7cf1cd80eeed3b7c808b7c12463295c751001 (diff)
netfilter: nf_log: replace BUG_ON by WARN_ON_ONCE when putting logger
Module reference is bumped for each user, this should not ever happen. But BUG_ON check should use rcu_access_pointer() instead. If this ever happens, do WARN_ON_ONCE() instead of BUG_ON() and consolidate pointer check under the rcu read side lock section. Fixes: fab4085f4e24 ("netfilter: log: nf_log_packet() as real unified interface") Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net')
-rw-r--r--net/netfilter/nf_log.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/net/netfilter/nf_log.c b/net/netfilter/nf_log.c
index 8cc52d2bd31b..e16f158388bb 100644
--- a/net/netfilter/nf_log.c
+++ b/net/netfilter/nf_log.c
@@ -193,11 +193,12 @@ void nf_logger_put(int pf, enum nf_log_type type)
return;
}
- BUG_ON(loggers[pf][type] == NULL);
-
rcu_read_lock();
logger = rcu_dereference(loggers[pf][type]);
- module_put(logger->me);
+ if (!logger)
+ WARN_ON_ONCE(1);
+ else
+ module_put(logger->me);
rcu_read_unlock();
}
EXPORT_SYMBOL_GPL(nf_logger_put);