linux/fs/autofs4
NeilBrown bc6eecff3d autofs: sanity check status reported with AUTOFS_DEV_IOCTL_FAIL
commit 9fa4eb8e49 upstream.

If a positive status is passed with the AUTOFS_DEV_IOCTL_FAIL ioctl,
autofs4_d_automount() will return

   ERR_PTR(status)

with that status to follow_automount(), which will then dereference an
invalid pointer.

So treat a positive status the same as zero, and map to ENOENT.

See comment in systemd src/core/automount.c::automount_send_ready().

Link: http://lkml.kernel.org/r/871sqwczx5.fsf@notabene.neil.brown.name
Signed-off-by: NeilBrown <neilb@suse.com>
Cc: Ian Kent <raven@themaw.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2017-06-29 13:00:28 +02:00
..
autofs_i.h autofs: remove possibly misleading /* #define DEBUG */ 2016-10-11 15:06:31 -07:00
dev-ioctl.c autofs: sanity check status reported with AUTOFS_DEV_IOCTL_FAIL 2017-06-29 13:00:28 +02:00
expire.c autofs: use dentry flags to block walks during expire 2016-09-19 15:36:17 -07:00
init.c autofs4: coding style fixes 2016-03-15 16:55:16 -07:00
inode.c autofs: use autofs4_free_ino() to kfree dentry data 2016-10-11 15:06:31 -07:00
Kconfig fs/Kconfig: move autofs, autofs4 out 2009-01-22 13:15:54 +03:00
Makefile autofs4: add miscellaneous device for ioctls 2008-10-16 11:21:39 -07:00
root.c autofs: fix pr_debug() message 2016-10-11 15:06:31 -07:00
symlink.c autofs4: coding style fixes 2016-03-15 16:55:16 -07:00
waitq.c fs: Better permission checking for submounts 2017-03-15 10:02:44 +08:00