From: Daniel Starke daniel.starke@siemens.com
commit edd5f60c340086891fab094ad61270d6c80f9ca4 upstream.
The current implementation activates the mux if it was restarted and opens the control channel if the mux was previously closed and we are now acting as initiator instead of responder, which is the default setting. This has two issues. 1) No mux is activated if we keep all default values and only switch to initiator. The control channel is not allocated but will be opened next which results in a NULL pointer dereference. 2) Switching the configuration after it was once configured while keeping the initiator value the same will not reopen the control channel if it was closed due to parameter incompatibilities. The mux remains dead.
Fix 1) by always activating the mux if it is dead after configuration. Fix 2) by always opening the control channel after mux activation.
Fixes: e1eaea46bb40 ("tty: n_gsm line discipline") Cc: stable@vger.kernel.org Signed-off-by: Daniel Starke daniel.starke@siemens.com Link: https://lore.kernel.org/r/20220504081733.3494-2-daniel.starke@siemens.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/tty/n_gsm.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-)
--- a/drivers/tty/n_gsm.c +++ b/drivers/tty/n_gsm.c @@ -2276,6 +2276,7 @@ static void gsm_copy_config_values(struc
static int gsm_config(struct gsm_mux *gsm, struct gsm_config *c) { + int ret = 0; int need_close = 0; int need_restart = 0;
@@ -2343,10 +2344,13 @@ static int gsm_config(struct gsm_mux *gs * FIXME: We need to separate activation/deactivation from adding * and removing from the mux array */ - if (need_restart) - gsm_activate_mux(gsm); - if (gsm->initiator && need_close) - gsm_dlci_begin_open(gsm->dlci[0]); + if (gsm->dead) { + ret = gsm_activate_mux(gsm); + if (ret) + return ret; + if (gsm->initiator) + gsm_dlci_begin_open(gsm->dlci[0]); + } return 0; }