linux-kernel - Re: [PATCH][next] fs: dlm: Fix memory leak of object mh

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Message-ID: <c5ea0085-969a-339f-fd92-6724cb1d928e@canonical.com>
Date:   Wed, 26 May 2021 16:11:06 +0100
From:   Colin Ian King <colin.king@...onical.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>
Cc:     Christine Caulfield <ccaulfie@...hat.com>,
        David Teigland <teigland@...hat.com>,
        Alexander Aring <aahringo@...hat.com>,
        cluster-devel@...hat.com, kernel-janitors@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] fs: dlm: Fix memory leak of object mh

On 26/05/2021 16:01, Dan Carpenter wrote:
> On Wed, May 26, 2021 at 02:40:39PM +0100, Colin King wrote:
>> From: Colin Ian King <colin.king@...onical.com>
>>
>> There is an error return path that is not kfree'ing mh after
>> it has been successfully allocates.  Fix this by free'ing it.
>>
>> Addresses-Coverity: ("Resource leak")
>> Fixes: a070a91cf140 ("fs: dlm: add more midcomms hooks")
>> Signed-off-by: Colin Ian King <colin.king@...onical.com>
>> ---
>>  fs/dlm/rcom.c | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/fs/dlm/rcom.c b/fs/dlm/rcom.c
>> index 085f21966c72..19298edc1573 100644
>> --- a/fs/dlm/rcom.c
>> +++ b/fs/dlm/rcom.c
>> @@ -393,6 +393,7 @@ static void receive_rcom_lookup(struct dlm_ls *ls, struct dlm_rcom *rc_in)
>>  	if (rc_in->rc_id == 0xFFFFFFFF) {
>>  		log_error(ls, "receive_rcom_lookup dump from %d", nodeid);
>>  		dlm_dump_rsb_name(ls, rc_in->rc_buf, len);
>> +		kfree(mh);
> 
> Am I looking at the same code as you?  (I often am not able to review
> your patches because you're doing development on stuff that hasn't hit
> linux-next).  Anyway, to me this doesn't seem like the correct fix at
> all.  There are some other things to free and the "mh" pointer is on
> a bunch of lists so it leads to use after frees.

I've send a V2. It was indeed a brown-paper-bag bad fix.

> 
> regards,
> dan carpenter
>