linux-kernel - Re: [PATCH] binder: fix memory leak in binder

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Message-ID: <14b868d1-6a61-ea32-abb9-05cdfa335a12@linux.dev>
Date:   Fri, 21 Jul 2023 17:28:11 +0800
From:   Qi Zheng <qi.zheng@...ux.dev>
To:     gregkh@...uxfoundation.org, Carlos Llamas <cmllamas@...gle.com>
Cc:     arve@...roid.com, tkjos@...roid.com, maco@...roid.com,
        joel@...lfernandes.org, brauner@...nel.org, surenb@...gle.com,
        linux-kernel@...r.kernel.org, Qi Zheng <zhengqi.arch@...edance.com>
Subject: Re: [PATCH] binder: fix memory leak in binder_init()



On 2023/6/26 00:16, Carlos Llamas wrote:
> On Sun, Jun 25, 2023 at 03:49:37PM +0000, Qi Zheng wrote:
>> From: Qi Zheng <zhengqi.arch@...edance.com>
>>
>> In binder_init(), the destruction of binder_alloc_shrinker_init() is not
>> performed in the wrong path, which will cause memory leaks. So this commit
>> introduces binder_alloc_shrinker_exit() and calls it in the wrong path to
>> fix that.
>>
>> Signed-off-by: Qi Zheng <zhengqi.arch@...edance.com>
>> ---
>>   drivers/android/binder.c       | 1 +
>>   drivers/android/binder_alloc.c | 6 ++++++
>>   drivers/android/binder_alloc.h | 1 +
>>   3 files changed, 8 insertions(+)
>>
>> diff --git a/drivers/android/binder.c b/drivers/android/binder.c
>> index 486c8271cab7..d720f93d8b19 100644
>> --- a/drivers/android/binder.c
>> +++ b/drivers/android/binder.c
>> @@ -6617,6 +6617,7 @@ static int __init binder_init(void)
>>   
>>   err_alloc_device_names_failed:
>>   	debugfs_remove_recursive(binder_debugfs_dir_entry_root);
>> +	binder_alloc_shrinker_exit();
>>   
>>   	return ret;
>>   }
>> diff --git a/drivers/android/binder_alloc.c b/drivers/android/binder_alloc.c
>> index 662a2a2e2e84..e3db8297095a 100644
>> --- a/drivers/android/binder_alloc.c
>> +++ b/drivers/android/binder_alloc.c
>> @@ -1087,6 +1087,12 @@ int binder_alloc_shrinker_init(void)
>>   	return ret;
>>   }
>>   
>> +void binder_alloc_shrinker_exit(void)
>> +{
>> +	unregister_shrinker(&binder_shrinker);
>> +	list_lru_destroy(&binder_alloc_lru);
>> +}
>> +
>>   /**
>>    * check_buffer() - verify that buffer/offset is safe to access
>>    * @alloc: binder_alloc for this proc
>> diff --git a/drivers/android/binder_alloc.h b/drivers/android/binder_alloc.h
>> index 138d1d5af9ce..dc1e2b01dd64 100644
>> --- a/drivers/android/binder_alloc.h
>> +++ b/drivers/android/binder_alloc.h
>> @@ -129,6 +129,7 @@ extern struct binder_buffer *binder_alloc_new_buf(struct binder_alloc *alloc,
>>   						  int pid);
>>   extern void binder_alloc_init(struct binder_alloc *alloc);
>>   extern int binder_alloc_shrinker_init(void);
>> +extern void binder_alloc_shrinker_exit(void);
>>   extern void binder_alloc_vma_close(struct binder_alloc *alloc);
>>   extern struct binder_buffer *
>>   binder_alloc_prepare_to_free(struct binder_alloc *alloc,
>> -- 
>> 2.30.2
>>
> 
> Thanks for the fix Qi Zheng.
> 
> Acked-by: Carlos Llamas <cmllamas@...gle.com>

Hi Greg,

Can this patch be merged? The Fixes tag is:

Fixes: f2517eb76f1f ("android: binder: Add global lru shrinker to binder")

Thanks,
Qi