linux-kernel - Re: [PATCH] dccp: Fix memleak in __feat_register

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Date:   Fri, 22 Mar 2019 21:39:31 +0800
From:   YueHaibing <yuehaibing@...wei.com>
To:     Mukesh Ojha <mojha@...eaurora.org>, <davem@...emloft.net>,
        <gerrit@....abdn.ac.uk>
CC:     <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>,
        <dccp@...r.kernel.org>
Subject: Re: [PATCH] dccp: Fix memleak in __feat_register_sp

On 2019/3/22 19:52, Mukesh Ojha wrote:
> 
> On 3/21/2019 7:40 PM, Yue Haibing wrote:
>> From: YueHaibing <yuehaibing@...wei.com>
>>
>> If dccp_feat_push_change fails, we forget free the mem
>> which is alloced by kmemdup in dccp_feat_clone_sp_val.
>>
>> Reported-by: Hulk Robot <hulkci@...wei.com>
>> Fixes: e8ef967a54f4 ("dccp: Registration routines for changing feature values")
>> Signed-off-by: YueHaibing <yuehaibing@...wei.com>
>> ---
>>   net/dccp/feat.c | 7 ++++++-
>>   1 file changed, 6 insertions(+), 1 deletion(-)
>>
>> diff --git a/net/dccp/feat.c b/net/dccp/feat.c
>> index f227f00..083e012 100644
>> --- a/net/dccp/feat.c
>> +++ b/net/dccp/feat.c
>> @@ -738,7 +738,12 @@ static int __feat_register_sp(struct list_head *fn, u8 feat, u8 is_local,
>>       if (dccp_feat_clone_sp_val(&fval, sp_val, sp_len))
>>           return -ENOMEM;
>>   -    return dccp_feat_push_change(fn, feat, is_local, mandatory, &fval);
>> +    if (dccp_feat_push_change(fn, feat, is_local, mandatory, &fval)) {
>> +        kfree(val->sp.vec);
> 
> Please atleast check the compilation first, don't  just rush into sending patch.
> 
> s/val/fval

A copy-paste typo, will fix it. Thanks!

> 
> 
> Thanks,
> Mukesh
> 
>> +        return -ENOMEM;
>> +    }
>> +
>> +    return 0;
>>   }
>>     /**
> 
> .
>