netdev - Re: [PATCH net-next] xprtrdma: Use struct

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Message-ID: <ad9eccc7-afd2-3419-b886-6210eeabd5b5@embeddedor.com>
Date:   Thu, 28 Mar 2019 15:41:49 -0500
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Chuck Lever <chuck.lever@...cle.com>
Cc:     Trond Myklebust <trond.myklebust@...merspace.com>,
        Anna Schumaker <anna.schumaker@...app.com>,
        Bruce Fields <bfields@...ldses.org>,
        Jeff Layton <jlayton@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Linux NFS Mailing List <linux-nfs@...r.kernel.org>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] xprtrdma: Use struct_size() in kzalloc()

Hi all,

Friendly ping:

Who can take this?

Thanks
--
Gustavo

On 1/31/19 8:11 AM, Chuck Lever wrote:
> 
> 
>> On Jan 30, 2019, at 7:46 PM, Gustavo A. R. Silva <gustavo@...eddedor.com> wrote:
>>
>> One of the more common cases of allocation size calculations is finding
>> the size of a structure that has a zero-sized array at the end, along
>> with memory for some number of elements for that array. For example:
>>
>> struct foo {
>>    int stuff;
>>    struct boo entry[];
>> };
>>
>> instance = kzalloc(sizeof(struct foo) + count * sizeof(struct boo), GFP_KERNEL);
>>
>> Instead of leaving these open-coded and prone to type mistakes, we can
>> now use the new struct_size() helper:
>>
>> instance = kzalloc(struct_size(instance, entry, count), GFP_KERNEL);
>>
>> This code was detected with the help of Coccinelle.
>>
>> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
> 
> Reviewed-by: Chuck Lever <chuck.lever@...cle.com>
> 
> 
>> ---
>> net/sunrpc/xprtrdma/verbs.c | 3 +--
>> 1 file changed, 1 insertion(+), 2 deletions(-)
>>
>> diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c
>> index 4994e75945b8..9e8cf7456840 100644
>> --- a/net/sunrpc/xprtrdma/verbs.c
>> +++ b/net/sunrpc/xprtrdma/verbs.c
>> @@ -811,8 +811,7 @@ static struct rpcrdma_sendctx *rpcrdma_sendctx_create(struct rpcrdma_ia *ia)
>> {
>> 	struct rpcrdma_sendctx *sc;
>>
>> -	sc = kzalloc(sizeof(*sc) +
>> -		     ia->ri_max_send_sges * sizeof(struct ib_sge),
>> +	sc = kzalloc(struct_size(sc, sc_sges, ia->ri_max_send_sges),
>> 		     GFP_KERNEL);
>> 	if (!sc)
>> 		return NULL;
>> -- 
>> 2.20.1
>>
> 
> --
> Chuck Lever
> 
> 
>