From 2b260dc923e8b77f700d9f990c074449c67ee0cb Mon Sep 17 00:00:00 2001 From: Kuniyuki Iwashima Date: Tue, 12 Aug 2025 14:32:05 -0400 Subject: [PATCH] net: Add net_passive_inc() and net_passive_dec(). [ Upstream commit e57a6320215c3967f51ab0edeff87db2095440e4 ] net_drop_ns() is NULL when CONFIG_NET_NS is disabled. The next patch introduces a function that increments and decrements net->passive. As a prep, let's rename and export net_free() to net_passive_dec() and add net_passive_inc(). Suggested-by: Eric Dumazet Link: https://lore.kernel.org/netdev/CANn89i+oUCt2VGvrbrweniTendZFEh+nwS=uonc004-aPkWy-Q@mail.gmail.com/ Signed-off-by: Kuniyuki Iwashima Reviewed-by: Eric Dumazet Link: https://patch.msgid.link/20250217191129.19967-2-kuniyu@amazon.com Signed-off-by: Jakub Kicinski Stable-dep-of: 59b33fab4ca4 ("smb: client: fix netns refcount leak after net_passive changes") Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- include/net/net_namespace.h | 16 ++++++++++++++++ net/core/net_namespace.c | 8 ++++---- 2 files changed, 20 insertions(+), 4 deletions(-) diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h index da93873df4dbd..022ee2fc627cf 100644 --- a/include/net/net_namespace.h +++ b/include/net/net_namespace.h @@ -291,6 +291,7 @@ static inline int check_net(const struct net *net) } void net_drop_ns(void *); +void net_passive_dec(struct net *net); #else @@ -320,8 +321,23 @@ static inline int check_net(const struct net *net) } #define net_drop_ns NULL + +static inline void net_passive_dec(struct net *net) +{ + refcount_dec(&net->passive); +} #endif +static inline void net_passive_inc(struct net *net) +{ + refcount_inc(&net->passive); +} + +/* Returns true if the netns initialization is completed successfully */ +static inline bool net_initialized(const struct net *net) +{ + return READ_ONCE(net->list.next); +} static inline void __netns_tracker_alloc(struct net *net, netns_tracker *tracker, diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c index 70fea7c1a4b0a..ee3c1b37d06c1 100644 --- a/net/core/net_namespace.c +++ b/net/core/net_namespace.c @@ -458,7 +458,7 @@ static void net_complete_free(void) } -static void net_free(struct net *net) +void net_passive_dec(struct net *net) { if (refcount_dec_and_test(&net->passive)) { kfree(rcu_access_pointer(net->gen)); @@ -476,7 +476,7 @@ void net_drop_ns(void *p) struct net *net = (struct net *)p; if (net) - net_free(net); + net_passive_dec(net); } struct net *copy_net_ns(unsigned long flags, @@ -517,7 +517,7 @@ put_userns: key_remove_domain(net->key_domain); #endif put_user_ns(user_ns); - net_free(net); + net_passive_dec(net); dec_ucounts: dec_net_namespaces(ucounts); return ERR_PTR(rv); @@ -662,7 +662,7 @@ static void cleanup_net(struct work_struct *work) key_remove_domain(net->key_domain); #endif put_user_ns(net->user_ns); - net_free(net); + net_passive_dec(net); } } -- 2.47.3