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Alan Cox a6a35a2a03 tty: handle the case where we cannot restore a line discipline ... commit 8a8dabf2dd upstream. Historically the N_TTY driver could never fail but this has become broken over time. Rather than trying to rewrite half the ldisc layer to fix the breakage introduce a second level of fallback with an N_NULL ldisc which cannot fail, and thus restore the guarantees required by the ldisc layer. We still try and fail to N_TTY first. It's much more useful to find yourself back in your old ldisc (first attempt) or in N_TTY (second attempt), and while I'm not aware of any code out there that makes those assumptions it's good to drive(r) defensively. Signed-off-by: Alan Cox <alan@linux.intel.com> Reported-by: Dmitry Vyukov <dvyukov@google.com> Tested-by: Dmitry Vyukov <dvyukov@google.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> [bwh: Backported to 3.16: adjust context] Signed-off-by: Ben Hutchings <ben@decadent.org.uk>		History 2018-10-21 08:45:38 +01:00
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asm-generic	seccomp: add "seccomp" syscall	2018-09-25 23:47:34 +01:00
drm	xdrm/i915: Use two 32bit reads for select 64bit REG_READ ioctls	2015-08-11 09:57:37 +01:00
linux	tty: handle the case where we cannot restore a line discipline	2018-10-21 08:45:38 +01:00
mtd	mtd: lpddr: add driver for LPDDR2-NVM PCM memories	2014-05-20 17:45:17 -07:00
rdma	RDMA/uapi: Include socket.h in rdma_user_cm.h	2014-09-17 09:22:17 -07:00
scsi	FCoE Updates for 3.9	2013-03-01 09:10:08 +00:00
sound	ALSA: compress: fix the struct alignment to 4 bytes	2014-06-23 12:15:33 +02:00
video	UAPI: (Scripted) Disintegrate include/video	2012-12-20 17:14:26 +00:00
xen	xen: install xen/gntdev.h and xen/gntalloc.h	2014-02-11 10:12:36 -05:00
Kbuild	UAPI: (Scripted) Set up UAPI Kbuild files	2012-10-02 18:01:35 +01:00