Daniel Starke 81a4dd5e6c tty: n_gsm: fix race condition in status line change on dead connections ... commit 3a75b205de upstream. gsm_cleanup_mux() cleans up the gsm by closing all DLCIs, stopping all timers, removing the virtual tty devices and clearing the data queues. This procedure, however, may cause subsequent changes of the virtual modem status lines of a DLCI. More data is being added the outgoing data queue and the deleted kick timer is restarted to handle this. At this point many resources have already been removed by the cleanup procedure. Thus, a kernel panic occurs. Fix this by proving in gsm_modem_update() that the cleanup procedure has not been started and the mux is still alive. Note that writing to a virtual tty is already protected by checks against the DLCI specific connection state. Fixes: c568f7086c ("tty: n_gsm: fix missing timer to handle stalled links") Cc: stable <stable@kernel.org> Signed-off-by: Daniel Starke <daniel.starke@siemens.com> Link: https://lore.kernel.org/r/20231026055844.3127-1-daniel.starke@siemens.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2023-11-08 17:26:50 +01:00
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hvc	hvc/xen: prevent concurrent accesses to the shared ring	2023-03-30 12:47:48 +02:00
ipwireless
serdev
serial	serial: 8250: omap: Move uart_write() inside PM section	2023-10-25 11:59:03 +02:00
vt	vc_screen: reload load of struct vc_data pointer in vcs_write() to avoid UAF	2023-05-24 17:36:54 +01:00
amiserial.c
ehv_bytechan.c
goldfish.c
Kconfig
Makefile
mips_ejtag_fdc.c
moxa.c
moxa.h
mxser.c
n_gsm.c	tty: n_gsm: fix race condition in status line change on dead connections	2023-11-08 17:26:50 +01:00
n_hdlc.c
n_null.c
n_tty.c	tty: fix hang on tty device with no_room set	2023-08-03 10:22:29 +02:00
nozomi.c
pty.c
synclink_gt.c
sysrq.c	workqueue: Introduce show_one_worker_pool and show_one_workqueue.	2023-05-11 23:00:35 +09:00
tty_audit.c
tty_baudrate.c
tty_buffer.c
tty_io.c	tty: Prevent writing chars during tcsetattr TCSADRAIN/FLUSH	2023-05-11 23:00:16 +09:00
tty_ioctl.c	tty: Prevent writing chars during tcsetattr TCSADRAIN/FLUSH	2023-05-11 23:00:16 +09:00
tty_jobctrl.c
tty_ldisc.c
tty_ldsem.c
tty_mutex.c
tty_port.c
tty.h	tty: Prevent writing chars during tcsetattr TCSADRAIN/FLUSH	2023-05-11 23:00:16 +09:00
ttynull.c
vcc.c