[PATCH 4.9 12/56] sget(): handle failures of register_shrinker()

Greg Kroah-Hartman
2018-03-02T08:50:58Z

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
@@ -519,7 +519,11 @@ 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;
}