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| author | NeilBrown <neilb@suse.com> | 2017-06-23 15:08:43 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-06-29 13:02:45 +0200 |
| commit | 909c25623aca614a9074ddc7bd8433447f39bcf6 (patch) | |
| tree | cc6de19d011147356f9a67f47ac37db06cb01fd6 | |
| parent | a2063a20547005c2e345591642f5483da7ad9a2d (diff) | |
| download | linux-909c25623aca614a9074ddc7bd8433447f39bcf6.tar.gz linux-909c25623aca614a9074ddc7bd8433447f39bcf6.tar.bz2 linux-909c25623aca614a9074ddc7bd8433447f39bcf6.zip | |
autofs: sanity check status reported with AUTOFS_DEV_IOCTL_FAIL
commit 9fa4eb8e490a28de40964b1b0e583d8db4c7e57c 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>
| -rw-r--r-- | fs/autofs4/dev-ioctl.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/autofs4/dev-ioctl.c b/fs/autofs4/dev-ioctl.c index 734cbf8d9676..dd9f1bebb5a3 100644 --- a/fs/autofs4/dev-ioctl.c +++ b/fs/autofs4/dev-ioctl.c @@ -344,7 +344,7 @@ 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); } |