From: Josh Triplett <josh@joshtriplett.org>
Date: Tue, 30 Jun 2015 21:58:27 +0000 (-0700)
Subject: devpts: if initialization failed, don't crash when opening /dev/ptmx
X-Git-Tag: omap-for-v4.2/fixes-rc1^2~53^2~33
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9ce71148b027e2bd27016139cae1c39401587695;p=pandora-kernel.git

devpts: if initialization failed, don't crash when opening /dev/ptmx

If devpts failed to initialize, it would store an ERR_PTR in the global
devpts_mnt.  A subsequent open of /dev/ptmx would call devpts_new_index,
which would dereference devpts_mnt and crash.

Avoid storing invalid values in devpts_mnt; leave it NULL instead.  Make
both devpts_new_index and devpts_pty_new fail gracefully with ENODEV in
that case, which then becomes the return value to the userspace open call
on /dev/ptmx.

[akpm@linux-foundation.org: remove unneeded static]
Signed-off-by: Josh Triplett <josh@joshtriplett.org>
Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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