linux-ext4 - [PATCH] mbcache: fix to detect failure of register

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Date:	Mon, 16 May 2016 23:16:38 +0800
From:	Chao Yu <chao@...nel.org>
To:	tytso@....edu, jack@...e.cz
Cc:	viro@...iv.linux.org.uk, linux-ext4@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, Chao Yu <yuchao0@...wei.com>
Subject: [PATCH] mbcache: fix to detect failure of register_shrinker

From: Chao Yu <yuchao0@...wei.com>

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@...wei.com>
---
 fs/mbcache.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

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 @@ struct mb_cache *mb_cache_create(int bucket_bits)
 	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);
 
-- 
2.7.2

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