[PATCH] ubifs: fix to check error code of register_shrinker

[Richard Weinberger]

Am 26.05.2015 um 13:23 schrieb Chao Yu:
> Ping.
> 
> Add Cc Richard Weinberger.

Patch looks good to me.
Artem, if you don't mind I'd pick it up for the 4.2 queue.

Thanks,
//richard

>> -----Original Message-----
>> From: linux-mtd [mailto:linux-mtd-bounces at lists.infradead.org] On Behalf Of Chao Yu
>> Sent: Monday, May 18, 2015 4:43 PM
>> To: dedekind1 at gmail.com; adrian.hunter at intel.com
>> Cc: linux-mtd at lists.infradead.org; linux-kernel at vger.kernel.org
>> Subject: [PATCH] ubifs: fix to check error code of register_shrinker
>>
>> register_shrinker() in ubifs_init() can fail due to fail to call kzalloc.
>> This patch fixes to check the return value of register_shrinker, otherwise
>> our shrinker may be unregistered after ubifs initialized successfully.
>>
>> Signed-off-by: Chao Yu <chao2.yu at samsung.com>
>> ---
>>  fs/ubifs/super.c | 5 ++++-
>>  1 file changed, 4 insertions(+), 1 deletion(-)
>>
>> diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c
>> index 75e6f04..fa83d1b 100644
>> --- a/fs/ubifs/super.c
>> +++ b/fs/ubifs/super.c
>> @@ -2245,7 +2245,9 @@ static int __init ubifs_init(void)
>>  	if (!ubifs_inode_slab)
>>  		return -ENOMEM;
>>
>> -	register_shrinker(&ubifs_shrinker_info);
>> +	err = register_shrinker(&ubifs_shrinker_info);
>> +	if (err)
>> +		goto out_slab;
>>
>>  	err = ubifs_compressors_init();
>>  	if (err)
>> @@ -2269,6 +2271,7 @@ out_compr:
>>  	ubifs_compressors_exit();
>>  out_shrinker:
>>  	unregister_shrinker(&ubifs_shrinker_info);
>> +out_slab:
>>  	kmem_cache_destroy(ubifs_inode_slab);
>>  	return err;
>>  }
>> --
>> 2.3.3
>>
>>
>>
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