When the call to gsm_register_devices() fails, we need to reclaim the memory
requested in gsm_dlci_alloc().
Fixes: 01aecd917114 ("tty: n_gsm: fix tty registration before control channel open")
Reported-and-tested-by: syzbot+b5d1f455d385b2c7da3c@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Edward AD <twuufnxlz@xxxxxxxxx>
---
drivers/tty/n_gsm.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c
index b3550ff9c494..df9bb87652b0 100644
--- a/drivers/tty/n_gsm.c
+++ b/drivers/tty/n_gsm.c
@@ -3136,8 +3136,10 @@ static int gsm_activate_mux(struct gsm_mux *gsm)
gsm->receive = gsm1_receive;
ret = gsm_register_devices(gsm_tty_driver, gsm->num);
- if (ret)
+ if (ret) {
+ gsm_dlci_free(&dlci->port);
return ret;
+ }
gsm->has_devices = true;
gsm->dead = false; /* Tty opens are now permissible */
--
2.25.1
