[dpdk-dev] [PATCH] kni: error release device list head could cause a kernel crash.
Ferruh Yigit
ferruh.yigit at intel.com
Wed Aug 31 15:24:11 CEST 2016
On 8/8/2016 12:48 PM, Ferruh Yigit wrote:
> Hi,
>
> On 8/6/2016 12:19 PM, 周杨超 wrote:
>> From 3edca1e3194959ba26a6c36143f8423009661b11 Mon Sep 17 00:00:00 2001
>> From: zhouyangchao <zhouyates at gmail.com>
>> Date: Sat, 6 Aug 2016 19:14:51 +0800
>> Subject: [PATCH] kni: error release device list head could cause a kernel crash.
>>
>> Signed-off-by: zhouyangchao <zhouyates at gmail.com>
>> ---
>> lib/librte_eal/linuxapp/kni/kni_misc.c | 4 ++--
>> 1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/lib/librte_eal/linuxapp/kni/kni_misc.c
>> b/lib/librte_eal/linuxapp/kni/kni_misc.c
>> index ae8133f..a49924b 100644
>> --- a/lib/librte_eal/linuxapp/kni/kni_misc.c
>> +++ b/lib/librte_eal/linuxapp/kni/kni_misc.c
>> @@ -276,8 +276,8 @@ kni_release(struct inode *inode, struct file *file)
>> #ifdef RTE_KNI_VHOST
>> kni_vhost_backend_release(dev);
>> #endif
>> - kni_dev_remove(dev);
>> list_del(&dev->list);
>> + kni_dev_remove(dev);
>> }
>> up_write(&knet->kni_list_lock);
>>
>> @@ -613,8 +613,8 @@ kni_ioctl_release(struct net *net,
>> #ifdef RTE_KNI_VHOST
>> kni_vhost_backend_release(dev);
>> #endif
>> - kni_dev_remove(dev);
>> list_del(&dev->list);
>> + kni_dev_remove(dev);
>> ret = 0;
>> break;
>> }
>> --
>>
>
> Can you please describe how crash can occur?
> And if you have a crash log, can you include it?
>
> Access to device via list, removing device from list and adding device
> to list all are protected by lock (kni_list_lock), so as far as I can
> see the order of removing device and removing it from list shouldn't be
> a problem.
I have sent a patch to fix a crash in remove path, if you are working on
master branch this can be same issue, can you please check following patch:
http://dpdk.org/dev/patchwork/patch/15571/
Regards,
ferruh
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