linux-kernel - Re: [PATCH v2] crypto: caam - free qman_fq after kill

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Date:   Thu, 13 Jul 2017 09:56:34 +0000
From:   Horia Geantă <horia.geanta@....com>
To:     Xulin Sun <xulin.sun@...driver.com>,
        Dan Douglass <dan.douglass@....com>,
        "herbert@...dor.apana.org.au" <herbert@...dor.apana.org.au>,
        "davem@...emloft.net" <davem@...emloft.net>
CC:     "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "xulinsun@...il.com" <xulinsun@...il.com>
Subject: Re: [PATCH v2] crypto: caam - free qman_fq after kill_fq

On 7/13/2017 12:21 PM, Xulin Sun wrote:
> kill_fq removes a complete frame queue, it needs to free the qman_fq
> in the last. Else kmemleak will report the below warning:
> 
> unreferenced object 0xffff800073085c80 (size 128):
>   comm "cryptomgr_test", pid 199, jiffies 4294937850 (age 67.840s)
>   hex dump (first 32 bytes):
>     00 00 00 00 00 00 00 00 a0 80 7e 00 00 80 ff ff
>     00 00 00 00 00 00 00 00 04 00 04 00 5c 01 00 00
>   backtrace:
>     [<ffff8000001e5760>] create_object+0xf8/0x258
>     [<ffff800000994e38>] kmemleak_alloc+0x58/0xa0
>     [<ffff8000001d5f18>] kmem_cache_alloc_trace+0x2c8/0x358
>     [<ffff8000007e8410>] create_caam_req_fq+0x40/0x170
>     [<ffff8000007e870c>] caam_drv_ctx_update+0x54/0x248
>     [<ffff8000007fca54>] aead_setkey+0x154/0x300
>     [<ffff800000452120>] setkey+0x50/0xf0
>     [<ffff80000045b144>] __test_aead+0x5ec/0x1028
>     [<ffff80000045c28c>] test_aead+0x44/0xc8
>     [<ffff80000045c368>] alg_test_aead+0x58/0xd0
>     [<ffff80000045bdb4>] alg_test+0x14c/0x308
>     [<ffff8000004588e8>] cryptomgr_test+0x50/0x58
>     [<ffff8000000c3b2c>] kthread+0xdc/0xf0
>     [<ffff800000083c00>] ret_from_fork+0x10/0x50
> 
> And check where the function kill_fq() is called to remove
> the additional kfree to qman_fq and avoid re-calling the released qman_fq.
> 
> Signed-off-by: Xulin Sun <xulin.sun@...driver.com>
Acked-by: Horia Geantă <horia.geanta@....com>

Thanks,
Horia