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autofs: sanity check status reported with AUTOFS_DEV_IOCTL_FAIL

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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>
This commit is contained in:
NeilBrown 2017-06-23 15:08:43 -07:00 committed by Greg Kroah-Hartman
parent 1d3d0f8b7c
commit b95aa98e77
1 changed files with 1 additions and 1 deletions
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2
fs/autofs4/dev-ioctl.c
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@ -331,7 +331,7 @@ static int autofs_dev_ioctl_fail(struct file *fp,
int status;
token = (autofs_wqt_t) param->fail.token;
status = param->fail.status ? param->fail.status : -ENOENT;
status = param->fail.status < 0 ? param->fail.status : -ENOENT;
return autofs4_wait_release(sbi, token, status);
}