This reverts commit 4e7f1644f2ac6d01dc584f6301c3b1d5aac4eaef.

The commit e9f2517a3e18 ("smb: client: fix TCP timers deadlock after rmmod") is not only a bogus fix for LOCKDEP null-ptr-deref but also introduces a real issue, TCP sockets leak, which will be explained in detail in the next revert.

Also, CNA assigned CVE-2024-54680 to it but is rejecting it. [0]

Thus, we are reverting the commit and its follow-up commit 4e7f1644f2ac ("smb: client: Fix netns refcount imbalance causing leaks and use-after-free").

Link: https://lore.kernel.org/all/2025040248-tummy-smilingly-4240@gregkh/ #[0] Fixes: 4e7f1644f2ac ("smb: client: Fix netns refcount imbalance causing leaks and use-after-free") Signed-off-by: Kuniyuki Iwashima kuniyu@amazon.com Cc: stable@vger.kernel.org --- fs/smb/client/connect.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/fs/smb/client/connect.c b/fs/smb/client/connect.c index 10a7c28d2d44..137a611c5ab0 100644 --- a/fs/smb/client/connect.c +++ b/fs/smb/client/connect.c @@ -300,7 +300,6 @@ cifs_abort_connection(struct TCP_Server_Info *server) server->ssocket->flags); sock_release(server->ssocket); server->ssocket = NULL; - put_net(cifs_net_ns(server)); } server->sequence_number = 0; server->session_estab = false; @@ -3367,12 +3366,8 @@ generic_ip_connect(struct TCP_Server_Info *server) /* * Grab netns reference for the socket. * - * This reference will be released in several situations: - * - In the failure path before the cifsd thread is started. - * - In the all place where server->socket is released, it is - * also set to NULL. - * - Ultimately in clean_demultiplex_info(), during the final - * teardown. + * It'll be released here, on error, or in clean_demultiplex_info() upon server + * teardown. */ get_net(net);

@@ -3388,8 +3383,10 @@ generic_ip_connect(struct TCP_Server_Info *server) }

rc = bind_socket(server); - if (rc < 0) + if (rc < 0) { + put_net(cifs_net_ns(server)); return rc; + }

/* * Eventually check for other socket options to change from @@ -3444,6 +3441,9 @@ generic_ip_connect(struct TCP_Server_Info *server) (server->rfc1001_sessinit == -1 && sport == htons(RFC1001_PORT))) rc = ip_rfc1001_connect(server);

+ if (rc < 0) + put_net(cifs_net_ns(server)); + return rc; }