[Linux-stable-mirror] [PATCH AUTOSEL for 4.14 021/110] sget(): handle failures of register_shrinker()

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 --- fs/super.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/fs/super.c b/fs/super.c index 994db21f59bf..79d7fc5e0ddd 100644 --- a/fs/super.c +++ b/fs/super.c @@ -522,7 +522,11 @@ 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; }