[PATCH v4] drm/ttm/tests: Fix memory leak in ttm_tt_simple_create()

[Jinjie Ruan]

On 2024/10/30 10:01, Jinjie Ruan wrote:
> Gentle ping.
> 
> On 2024/10/26 10:07, Jinjie Ruan wrote:
>> modprobe ttm_device_test and then rmmod ttm_device_test, the following
>> memory leaks occurs:
>>
>> The ttm->pages allocated in ttm_tt_init() is not freed after calling
>> ttm_tt_simple_create(), which cause the memory leak:
>>
>> 	unreferenced object 0xffffff80caf27750 (size 8):
>> 	  comm "kunit_try_catch", pid 2242, jiffies 4295055735
>> 	  hex dump (first 8 bytes):
>> 	    c0 1e 3d c3 fe ff ff ff                          ..=.....
>> 	  backtrace (crc 3d11615a):
>> 	    [<000000007f57312a>] kmemleak_alloc+0x34/0x40
>> 	    [<000000008c6c4c7e>] __kmalloc_node_noprof+0x304/0x3e4
>> 	    [<00000000679c1182>] __kvmalloc_node_noprof+0x1c/0x144
>> 	    [<000000006aed0a3d>] ttm_tt_init+0x138/0x28c [ttm]
>> 	    [<000000005c331998>] drm_gem_shmem_free+0x60/0x534 [drm_shmem_helper]
>> 	    [<0000000022b4f375>] kunit_try_run_case+0x13c/0x3ac
>> 	    [<00000000c525d725>] kunit_generic_run_threadfn_adapter+0x80/0xec
>> 	    [<000000002db94a1f>] kthread+0x2e8/0x374
>> 	    [<000000002c457ad7>] ret_from_fork+0x10/0x20
>> 	......
>>
>> Fix it by calling ttm_tt_fini() in the exit function.
>>
>> Cc: stable at vger.kernel.org
>> Fixes: e6f7c641fae3 ("drm/ttm/tests: Add tests for ttm_tt")
>> Reviewed-by: Nirmoy Das <nirmoy.das at intel.com>

Hi, Nirmoy,

could this patch be merged?

>> Signed-off-by: Jinjie Ruan <ruanjinjie at huawei.com>
>> ---
>> v4:
>> - Split out to be alone.
>> v3:
>> - s/fllowing/following/
>> v2:
>> - Add Reviewed-by.
>> ---
>>  drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c b/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c
>> index b91c13f46225..9ff216ec58ef 100644
>> --- a/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c
>> +++ b/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c
>> @@ -54,6 +54,7 @@ static struct ttm_tt *ttm_tt_simple_create(struct ttm_buffer_object *bo, u32 pag
>>  
>>  static void ttm_tt_simple_destroy(struct ttm_device *bdev, struct ttm_tt *ttm)
>>  {
>> +	ttm_tt_fini(ttm);
>>  	kfree(ttm);
>>  }
>>