Samuel Thibault 3b78db2646 speakup: Do not let the line discipline be used several times ... commit d412275444 upstream. Speakup has only one speakup_tty variable to store the tty it is managing. This makes sense since its codebase currently assumes that there is only one user who controls the screen reading. That however means that we have to forbid using the line discipline several times, otherwise the second closure would try to free a NULL ldisc_data, leading to general protection fault: 0000 [#1] SMP KASAN PTI RIP: 0010:spk_ttyio_ldisc_close+0x2c/0x60 Call Trace: tty_ldisc_release+0xa2/0x340 tty_release_struct+0x17/0xd0 tty_release+0x9d9/0xcc0 __fput+0x231/0x740 task_work_run+0x12c/0x1a0 do_exit+0x9b5/0x2230 ? release_task+0x1240/0x1240 ? __do_page_fault+0x562/0xa30 do_group_exit+0xd5/0x2a0 __x64_sys_exit_group+0x35/0x40 do_syscall_64+0x89/0x2b0 ? page_fault+0x8/0x30 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Cc: stable@vger.kernel.org Reported-by: 秦世松 <qinshisong1205@gmail.com> Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org> Tested-by: Shisong Qin <qinshisong1205@gmail.com> Link: https://lore.kernel.org/r/20201110183541.fzgnlwhjpgqzjeth@function Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2020-11-24 13:29:20 +01:00
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DefaultKeyAssignments	…
Kconfig	…
Makefile	…
TODO	…
buffers.c	…
devsynth.c	…
fakekey.c	…
i18n.c	…
i18n.h	…
keyhelp.c	…
kobjects.c	…
main.c	staging/speakup: fix get_word non-space look-ahead	2020-03-25 08:25:55 +01:00
selection.c	vt: selection, push console lock down	2020-03-12 13:00:21 +01:00
serialio.c	…
serialio.h	staging: speakup: serialio: fix warning linux/serial.h is included more than once	2019-05-30 13:59:16 -07:00
speakup.h	staging: speakup: refactor to use existing code in vt	2019-04-19 15:09:10 +02:00
speakup_acnt.h	…
speakup_acntpc.c	…
speakup_acntsa.c	…
speakup_apollo.c	…
speakup_audptr.c	…
speakup_bns.c	…
speakup_decext.c	…
speakup_decpc.c	…
speakup_dectlk.c	…
speakup_dtlk.c	…
speakup_dtlk.h	…
speakup_dummy.c	…
speakup_keypc.c	…
speakup_ltlk.c	…
speakup_soft.c	…
speakup_spkout.c	…
speakup_txprt.c	…
speakupmap.h	…
speakupmap.map	…
spk_priv.h	…
spk_priv_keyinfo.h	…
spk_ttyio.c	speakup: Do not let the line discipline be used several times	2020-11-24 13:29:20 +01:00
spk_types.h	…
spkguide.txt	…
synth.c	…
sysfs-driver-speakup	staging: speakup: document sysfs attributes	2019-10-04 10:06:05 +02:00
thread.c	…
varhandlers.c	…