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    Subject[PATCH 3.18 05/24] sget(): handle failures of register_shrinker()
    Date
    3.18-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Al Viro <viro@zeniv.linux.org.uk>


    [ Upstream commit 9ee332d99e4d5a97548943b81c54668450ce641b ]

    Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
    Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    fs/super.c | 6 +++++-
    1 file changed, 5 insertions(+), 1 deletion(-)

    --- a/fs/super.c
    +++ b/fs/super.c
    @@ -476,7 +476,11 @@ retry:
    hlist_add_head(&s->s_instances, &type->fs_supers);
    spin_unlock(&sb_lock);
    get_filesystem(type);
    - register_shrinker(&s->s_shrink);
    + err = register_shrinker(&s->s_shrink);
    + if (err) {
    + deactivate_locked_super(s);
    + s = ERR_PTR(err);
    + }
    return s;
    }


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