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Commit 57e87fa6 authored by Al Viro's avatar Al Viro Committed by Thierry Strudel
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do_add_mount()/umount -l races


normally we deal with lock_mount()/umount races by checking that
mountpoint to be is still in our namespace after lock_mount() has
been done.  However, do_add_mount() skips that check when called
with MNT_SHRINKABLE in flags (i.e. from finish_automount()).  The
reason is that ->mnt_ns may be a temporary namespace created exactly
to contain automounts a-la NFS4 referral handling.  It's not the
namespace of the caller, though, so check_mnt() would fail here.
We still need to check that ->mnt_ns is non-NULL in that case,
though.

Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
(cherry picked from commit 156cacb1)
parent 32d9bbb0
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