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Wed, 09 Sep 2026 00:10:33 -0700 (PDT) Date: Wed, 09 Sep 2026 00:10:33 -0700 In-Reply-To: <6a6c3d48.5cf34cee.28a846.0008.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6aa10669.f81106d8.285f0a.000d.GAE@google.com> Subject: Forwarded: Re: test patch From: syzbot To: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" For archival purposes, forwarding an incoming command email to linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com. *** Subject: Re: test patch Author: syedtayyabfarooq08@gmail.com #syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git= master diff --git a/drivers/usb/gadget/function/u_serial.c b/drivers/usb/gadget/fu= nction/u_serial.c index cdd1dfc666c4..4435cc42d1c0 100644 --- a/drivers/usb/gadget/function/u_serial.c +++ b/drivers/usb/gadget/function/u_serial.c @@ -603,6 +603,41 @@ static int gserial_wakeup_host(struct gserial *gser) =20 /* TTY Driver */ =20 +static int gs_install(struct tty_driver *driver, struct tty_struct *tty) +{ + struct gs_port *port; + struct tty_port *tport; + int ret; + + mutex_lock(&ports[tty->index].lock); + port =3D ports[tty->index].port; + if (!port) { + mutex_unlock(&ports[tty->index].lock); + return -ENODEV; + } + + tport =3D tty_port_get(&port->port); + mutex_unlock(&ports[tty->index].lock); + + if (!tport) + return -ENODEV; + + ret =3D tty_port_install(tport, driver, tty); + if (ret) { + tty_port_put(tport); + return ret; + } + + tty->driver_data =3D port; + + return 0; +} + +static void gs_cleanup(struct tty_struct *tty) +{ + tty_port_put(tty->port); +} + /* * gs_open sets up the link between a gs_port and its associated TTY. * That link is broken *only* by TTY close(), and all driver methods @@ -911,6 +946,8 @@ static int gs_get_icount(struct tty_struct *tty, static const struct tty_operations gs_tty_ops =3D { .open =3D gs_open, .close =3D gs_close, + .install =3D gs_install, + .cleanup =3D gs_cleanup, .write =3D gs_write, .put_char =3D gs_put_char, .flush_chars =3D gs_flush_chars, @@ -1203,6 +1240,18 @@ static void gs_console_exit(struct gs_port *port) =20 #endif =20 +static void gs_port_destruct(struct tty_port *tport) +{ + struct gs_port *port =3D container_of(tport, struct gs_port, port); + + kfree(port); +} + +static const struct tty_port_operations gs_port_ops =3D { + .destruct =3D gs_port_destruct, +}; + + static int gs_port_alloc(unsigned port_num, struct usb_cdc_line_coding *coding) { @@ -1222,6 +1271,7 @@ gs_port_alloc(unsigned port_num, struct usb_cdc_line_= coding *coding) } =20 tty_port_init(&port->port); + port->port.ops =3D &gs_port_ops; spin_lock_init(&port->port_lock); init_waitqueue_head(&port->drain_wait); init_waitqueue_head(&port->close_wait); @@ -1258,8 +1308,7 @@ static void gserial_free_port(struct gs_port *port) /* wait for old opens to finish */ wait_event(port->close_wait, gs_closed(port)); WARN_ON(port->port_usb !=3D NULL); - tty_port_destroy(&port->port); - kfree(port); + tty_port_put(&port->port); } =20 void gserial_free_line(unsigned char port_num)