Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Subject: Re: [PATCH] genwqe: Fix size check
To:     haver <haver@linux.vnet.ibm.com>
Cc:     "Guilherme G . Piccoli" <gpiccoli@linux.vnet.ibm.com>,
        Arnd Bergmann <arnd@arndb.de>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        linux-kernel@vger.kernel.org
References: <20181212134518.4587-1-borntraeger@de.ibm.com>
 <64f068a535ab7bfe15f04ba86fb067b0@linux.vnet.ibm.com>
From:   Christian Borntraeger <borntraeger@de.ibm.com>
Openpgp: preference=signencrypt
Autocrypt: addr=borntraeger@de.ibm.com; prefer-encrypt=mutual; keydata=
 xsFNBE6cPPgBEAC2VpALY0UJjGmgAmavkL/iAdqul2/F9ONz42K6NrwmT+SI9CylKHIX+fdf
 J34pLNJDmDVEdeb+brtpwC9JEZOLVE0nb+SR83CsAINJYKG3V1b3Kfs0hydseYKsBYqJTN2j
 CmUXDYq9J7uOyQQ7TNVoQejmpp5ifR4EzwIFfmYDekxRVZDJygD0wL/EzUr8Je3/j548NLyL
 4Uhv6CIPf3TY3/aLVKXdxz/ntbLgMcfZsDoHgDk3lY3r1iwbWwEM2+eYRdSZaR4VD+JRD7p8
 0FBadNwWnBce1fmQp3EklodGi5y7TNZ/CKdJ+jRPAAnw7SINhSd7PhJMruDAJaUlbYaIm23A
 +82g+IGe4z9tRGQ9TAflezVMhT5J3ccu6cpIjjvwDlbxucSmtVi5VtPAMTLmfjYp7VY2Tgr+
 T92v7+V96jAfE3Zy2nq52e8RDdUo/F6faxcumdl+aLhhKLXgrozpoe2nL0Nyc2uqFjkjwXXI
 OBQiaqGeWtxeKJP+O8MIpjyGuHUGzvjNx5S/592TQO3phpT5IFWfMgbu4OreZ9yekDhf7Cvn
 /fkYsiLDz9W6Clihd/xlpm79+jlhm4E3xBPiQOPCZowmHjx57mXVAypOP2Eu+i2nyQrkapaY
 IdisDQfWPdNeHNOiPnPS3+GhVlPcqSJAIWnuO7Ofw1ZVOyg/jwARAQABzTRDaHJpc3RpYW4g
 Qm9ybnRyYWVnZXIgKElCTSkgPGJvcm50cmFlZ2VyQGRlLmlibS5jb20+wsF4BBMBAgAiBQJO
 nDz4AhsDBgsJCAcDAgYVCAIJCgsEFgIDAQIeAQIXgAAKCRARe7yAtaYcfOYVD/9sqc6ZdYKD
 bmDIvc2/1LL0g7OgiA8pHJlYN2WHvIhUoZUIqy8Sw2EFny/nlpPVWfG290JizNS2LZ0mCeGZ
 80yt0EpQNR8tLVzLSSr0GgoY0lwsKhAnx3p3AOrA8WXsPL6prLAu3yJI5D0ym4MJ6KlYVIjU
 ppi4NLWz7ncA2nDwiIqk8PBGxsjdc/W767zOOv7117rwhaGHgrJ2tLxoGWj0uoH3ZVhITP1z
 gqHXYaehPEELDV36WrSKidTarfThCWW0T3y4bH/mjvqi4ji9emp1/pOWs5/fmd4HpKW+44tD
 Yt4rSJRSa8lsXnZaEPaeY3nkbWPcy3vX6qafIey5d8dc8Uyaan39WslnJFNEx8cCqJrC77kI
 vcnl65HaW3y48DezrMDH34t3FsNrSVv5fRQ0mbEed8hbn4jguFAjPt4az1xawSp0YvhzwATJ
 YmZWRMa3LPx/fAxoolq9cNa0UB3D3jmikWktm+Jnp6aPeQ2Db3C0cDyxcOQY/GASYHY3KNra
 z8iwS7vULyq1lVhOXg1EeSm+lXQ1Ciz3ub3AhzE4c0ASqRrIHloVHBmh4favY4DEFN19Xw1p
 76vBu6QjlsJGjvROW3GRKpLGogQTLslbjCdIYyp3AJq2KkoKxqdeQYm0LZXjtAwtRDbDo71C
 FxS7i/qfvWJv8ie7bE9A6Wsjn87BTQROnDz4ARAAmPI1e8xB0k23TsEg8O1sBCTXkV8HSEq7
 JlWz7SWyM8oFkJqYAB7E1GTXV5UZcr9iurCMKGSTrSu3ermLja4+k0w71pLxws859V+3z1jr
 nhB3dGzVZEUhCr3EuN0t8eHSLSMyrlPL5qJ11JelnuhToT6535cLOzeTlECc51bp5Xf6/XSx
 SMQaIU1nDM31R13o98oRPQnvSqOeljc25aflKnVkSfqWSrZmb4b0bcWUFFUKVPfQ5Z6JEcJg
 Hp7qPXHW7+tJTgmI1iM/BIkDwQ8qe3Wz8R6rfupde+T70NiId1M9w5rdo0JJsjKAPePKOSDo
 RX1kseJsTZH88wyJ30WuqEqH9zBxif0WtPQUTjz/YgFbmZ8OkB1i+lrBCVHPdcmvathknAxS
 bXL7j37VmYNyVoXez11zPYm+7LA2rvzP9WxR8bPhJvHLhKGk2kZESiNFzP/E4r4Wo24GT4eh
 YrDo7GBHN82V4O9JxWZtjpxBBl8bH9PvGWBmOXky7/bP6h96jFu9ZYzVgIkBP3UYW+Pb1a+b
 w4A83/5ImPwtBrN324bNUxPPqUWNW0ftiR5b81ms/rOcDC/k/VoN1B+IHkXrcBf742VOLID4
 YP+CB9GXrwuF5KyQ5zEPCAjlOqZoq1fX/xGSsumfM7d6/OR8lvUPmqHfAzW3s9n4lZOW5Jfx
 bbkAEQEAAcLBXwQYAQIACQUCTpw8+AIbDAAKCRARe7yAtaYcfPzbD/9WNGVf60oXezNzSVCL
 hfS36l/zy4iy9H9rUZFmmmlBufWOATjiGAXnn0rr/Jh6Zy9NHuvpe3tyNYZLjB9pHT6mRZX7
 Z1vDxeLgMjTv983TQ2hUSlhRSc6e6kGDJyG1WnGQaqymUllCmeC/p9q5m3IRxQrd0skfdN1V
 AMttRwvipmnMduy5SdNayY2YbhWLQ2wS3XHJ39a7D7SQz+gUQfXgE3pf3FlwbwZhRtVR3z5u
 aKjxqjybS3Ojimx4NkWjidwOaUVZTqEecBV+QCzi2oDr9+XtEs0m5YGI4v+Y/kHocNBP0myd
 pF3OoXvcWdTb5atk+OKcc8t4TviKy1WCNujC+yBSq3OM8gbmk6NwCwqhHQzXCibMlVF9hq5a
 FiJb8p4QKSVyLhM8EM3HtiFqFJSV7F+h+2W0kDyzBGyE0D8z3T+L3MOj3JJJkfCwbEbTpk4f
 n8zMboekuNruDw1OADRMPlhoWb+g6exBWx/YN4AY9LbE2KuaScONqph5/HvJDsUldcRN3a5V
 RGIN40QWFVlZvkKIEkzlzqpAyGaRLhXJPv/6tpoQaCQQoSAc5Z9kM/wEd9e2zMeojcWjUXgg
 oWj8A/wY4UXExGBu+UCzzP/6sQRpBiPFgmqPTytrDo/gsUGqjOudLiHQcMU+uunULYQxVghC
 syiRa+UVlsKmx1hsEg==
Date:   Wed, 12 Dec 2018 15:36:57 +0100
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101
 Thunderbird/52.9.1
MIME-Version: 1.0
In-Reply-To: <64f068a535ab7bfe15f04ba86fb067b0@linux.vnet.ibm.com>
Content-Language: en-US
Message-Id: <cdcfbeed-9e33-0d50-02e4-5b5b6d61660e@de.ibm.com>
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 8bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On 12.12.2018 15:18, haver wrote:
> Hi Christian,
> 
> On 2018-12-12 14:45, Christian Borntraeger wrote:
>> Calling the test program genwqe_cksum with the default buffer size of
>> 2MB triggers the following kernel warning on s390:
>>
>> WARNING: CPU: 30 PID: 9311 at mm/page_alloc.c:3189
>> __alloc_pages_nodemask+0x45c/0xbe0
>> CPU: 30 PID: 9311 Comm: genwqe_cksum Kdump: loaded Not tainted
>> 3.10.0-957.el7.s390x #1
>> task: 00000005e5d13980 ti: 00000005e7c6c000 task.ti: 00000005e7c6c000
>> Krnl PSW : 0704c00180000000 00000000002780ac
>> (__alloc_pages_nodemask+0x45c/0xbe0)
>>            R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:0 PM:0 EA:3
>> Krnl GPRS: 00000000002932b8 0000000000b73d7c 0000000000000010 0000000000000009
>>            0000000000000041 00000005e7c6f9b8 0000000000000001 00000000000080d0
>>            0000000000000000 0000000000b70500 0000000000000001 0000000000000000
>>            0000000000b70528 00000000007682c0 0000000000277df2 00000005e7c6f9a0
>> Krnl Code: 000000000027809e: de7195001000    ed    1280(114,%r9),0(%r1)
>>        00000000002780a4: a774fead        brc    7,277dfe
>>       #00000000002780a8: a7f40001        brc    15,2780aa
>>       >00000000002780ac: 92011000        mvi    0(%r1),1
>>        00000000002780b0: a7f4fea7        brc    15,277dfe
>>        00000000002780b4: 9101c6b6        tm    1718(%r12),1
>>        00000000002780b8: a784ff3a        brc    8,277f2c
>>        00000000002780bc: a7f4fe2e        brc    15,277d18
>> Call Trace:
>> ([<0000000000277df2>] __alloc_pages_nodemask+0x1a2/0xbe0)
>>  [<000000000013afae>] s390_dma_alloc+0xfe/0x310
>>  [<000003ff8065f362>] __genwqe_alloc_consistent+0xfa/0x148 [genwqe_card]
>>  [<000003ff80658f7a>] genwqe_mmap+0xca/0x248 [genwqe_card]
>>  [<00000000002b2712>] mmap_region+0x4e2/0x778
>>  [<00000000002b2c54>] do_mmap+0x2ac/0x3e0
>>  [<0000000000292d7e>] vm_mmap_pgoff+0xd6/0x118
>>  [<00000000002b081c>] SyS_mmap_pgoff+0xdc/0x268
>>  [<00000000002b0a34>] SyS_old_mmap+0x8c/0xb0
>>  [<000000000074e518>] sysc_tracego+0x14/0x1e
>>  [<000003ffacf87dc6>] 0x3ffacf87dc6
>>
>> turns out the check in __genwqe_alloc_consistent uses "> MAX_ORDER"
>> while the mm code uses ">= MAX_ORDER". Fix genwqe.
>>
>> Cc: stable@vger.kernel.org
>> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
>> ---
>>  drivers/misc/genwqe/card_utils.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/misc/genwqe/card_utils.c b/drivers/misc/genwqe/card_utils.c
>> index 3fcb9a2fe1c9..efe2fb72d54b 100644
>> --- a/drivers/misc/genwqe/card_utils.c
>> +++ b/drivers/misc/genwqe/card_utils.c
>> @@ -215,7 +215,7 @@ u32 genwqe_crc32(u8 *buff, size_t len, u32 init)
>>  void *__genwqe_alloc_consistent(struct genwqe_dev *cd, size_t size,
>>                     dma_addr_t *dma_handle)
>>  {
>> -    if (get_order(size) > MAX_ORDER)
>> +    if (get_order(size) >= MAX_ORDER)
>>          return NULL;
>>
>>      return dma_zalloc_coherent(&cd->pci_dev->dev, size, dma_handle,
> 
> Thanks for sending a fix for this ugly message.
> Regards
> 
> Frank
> 
> Signed-off-by: Frank Haverkamp <haver@linux.vnet.ibm.com>

This should have been an Acked-by, I guess.
Will this go via Gregs misc driver tree?

Christian