linux-kernel - Re: [PATCH v2] xfrm: policy: Fix possible user after free in __xfrm_policy

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Date:   Thu, 28 Feb 2019 14:48:17 +0800
From:   YueHaibing <yuehaibing@...wei.com>
To:     Herbert Xu <herbert@...dor.apana.org.au>
CC:     <steffen.klassert@...unet.com>, <davem@...emloft.net>,
        <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>
Subject: Re: [PATCH v2] xfrm: policy: Fix possible user after free in
 __xfrm_policy_unlink


On 2019/2/28 14:41, Herbert Xu wrote:
> On Thu, Feb 28, 2019 at 02:38:01PM +0800, Yue Haibing wrote:
>>
>> diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
>> index a131f9f..aaa45c9 100644
>> --- a/net/xfrm/xfrm_user.c
>> +++ b/net/xfrm/xfrm_user.c
>> @@ -1424,7 +1424,8 @@ static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
>>  	ret = verify_policy_dir(p->dir);
>>  	if (ret)
>>  		return ret;
>> -	if (p->index && ((p->index & XFRM_POLICY_MAX) != p->dir))
>> +	if (p->index && (((p->index & XFRM_POLICY_MAX) != p->dir) ||
>> +			 (xfrm_policy_id2dir(p->index) >= XFRM_POLICY_MAX)))
> 
> Please just check 
> 
> 	xfrm_policy_id2dir(p->index) != p->dir


Oh, it indeed can be merged, Thanks!

> 
> Thanks,
>