mbcache: fix to detect failure of register_shrinker
register_shrinker in mb_cache_create may fail due to no memory. This
patch fixes to do the check of return value of register_shrinker and
handle the error case, otherwise mb_cache_create may return with no
error, but losing the inner shrinker.
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
diff --git a/fs/mbcache.c b/fs/mbcache.c
index eccda3a..c5bd19f 100644
--- a/fs/mbcache.c
+++ b/fs/mbcache.c
@@ -366,7 +366,11 @@
cache->c_shrink.count_objects = mb_cache_count;
cache->c_shrink.scan_objects = mb_cache_scan;
cache->c_shrink.seeks = DEFAULT_SEEKS;
- register_shrinker(&cache->c_shrink);
+ if (register_shrinker(&cache->c_shrink)) {
+ kfree(cache->c_hash);
+ kfree(cache);
+ goto err_out;
+ }
INIT_WORK(&cache->c_shrink_work, mb_cache_shrink_worker);