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Samuel Thibault fd97394957 speakup: Reject setting the speakup line discipline outside of speakup 
commit f0992098cadb4c9c6a00703b66cafe604e178fea upstream.

Speakup exposing a line discipline allows userland to try to use it,
while it is deemed to be useless, and thus uselessly exposes potential
bugs. One of them is simply that in such a case if the line sends data,
spk_ttyio_receive_buf2 is called and crashes since spk_ttyio_synth
is NULL.

This change restricts the use of the speakup line discipline to
speakup drivers, thus avoiding such kind of issues altogether.

Cc: stable@vger.kernel.org
Reported-by: Shisong Qin <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/20201129193523.hm3f6n5xrn6fiyyc@function
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2021-03-16 16:42:05 +08:00
..
android staging: android: ashmem: Fix lockdep warning for write operation 2021-03-16 16:33:02 +08:00
axis-fifo Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
board Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
clocking-wizard Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
comedi staging: comedi: cb_pcidas: Allow 2-channel commands for AO subdevice 2021-03-16 16:40:15 +08:00
emxx_udc staging: emxx_udc: Fix passing of NULL to dma_alloc_coherent() 2021-03-16 16:38:34 +08:00
exfat Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
fbtft Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
fieldbus staging: fieldbus: anybuss: jump to correct label in an error path 2021-03-16 16:40:15 +08:00
fsl-dpaa2 Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
fwserial Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
gasket staging: gasket: Fix mapping refcnt leak when register/store fails 2021-03-16 16:30:10 +08:00
gdm724x Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
goldfish Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
greybus staging: greybus: audio: fix uninitialized value issue 2021-03-16 16:36:08 +08:00
gs_fpgaboot Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
iio staging: iio: ad2s1210: Fix SPI reading 2021-03-16 16:28:18 +08:00
isdn Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
kpc2000 staging: kpc2000: fix error return code in kp2000_pcie_probe() 2021-03-16 16:28:18 +08:00
ks7010 Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
media media: staging/intel-ipu3: css: Correctly reset some memory 2021-03-16 16:38:26 +08:00
most Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
mt7621-dma Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
mt7621-dts Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
mt7621-pci Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
mt7621-pci-phy Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
mt7621-pinctrl Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
netlogic Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
nvec Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
octeon staging/octeon: fix up merge error 2021-03-16 16:41:53 +08:00
octeon-usb Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
olpc_dcon Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
pi433 Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
qlge Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
ralink-gdma staging: ralink-gdma: fix kconfig dependency bug for DMA_RALINK 2021-03-16 16:41:38 +08:00
rtl8188eu staging:r8188eu: avoid skb_clone for amsdu to msdu conversion 2021-03-16 16:37:14 +08:00
rtl8192e Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
rtl8192u staging: rtl8192u: Do not use GFP_KERNEL in atomic context 2021-03-16 16:38:33 +08:00
rtl8712 staging: rtl8712: handle firmware load failure 2021-03-16 16:33:02 +08:00
rtl8723bs staging: rtl8723bs: Add 024c:0627 to the list of SDIO device-ids 2021-03-16 16:41:27 +08:00
rts5208 Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
sm750fb staging: sm750fb: add missing case while setting FB_VISUAL 2021-03-16 16:30:13 +08:00
speakup speakup: Reject setting the speakup line discipline outside of speakup 2021-03-16 16:42:05 +08:00
unisys Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
uwb Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
vc04_services staging: vchiq_arm: Add a matching unregister call 2021-03-16 16:33:31 +08:00
vme Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
vt6655 Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
vt6656 staging: vt6656: Power save stop wake_up_count wrap around. 2021-03-16 16:27:02 +08:00
wilc1000 net: wilc1000: clean up resource in error path of init mon interface 2021-03-16 16:38:40 +08:00
wlan-ng staging: wlan-ng: fix out of bounds read in prism2sta_probe_usb() 2021-03-16 16:36:03 +08:00
wusbcore Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
Kconfig Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
Makefile Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00