NeilBrown 909c25623a 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>

2017-06-29 13:02:45 +02:00

..

autofs_i.h

rcu: Separate the RCU synchronization types and APIs into <linux/rcupdate_wait.h>

2017-03-02 08:42:24 +01:00

dev-ioctl.c

autofs: sanity check status reported with AUTOFS_DEV_IOCTL_FAIL

2017-06-29 13:02:45 +02:00

expire.c

autofs - dont hold spin lock over direct mount expire

2016-12-03 20:51:50 -05:00

init.c

autofs4: coding style fixes

2016-03-15 16:55:16 -07:00

inode.c

don't open-code file_inode()

2016-12-04 18:29:28 -05:00

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: take more care to not update last_used on path walk

2017-02-27 18:43:45 -08:00

symlink.c

vfs: remove ".readlink = generic_readlink" assignments

2016-12-09 16:45:04 +01:00

waitq.c

sched/headers: Prepare for new header dependencies before moving code to <linux/sched/signal.h>

2017-03-02 08:42:29 +01:00