linux-kernel - Re: [PATCH 3/18] VMCI: Use kmemdup instead of kmalloc + memcpy

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Date:	Mon, 26 May 2014 17:54:30 +0200
From:	walter harms <wharms@....de>
To:	Benoit Taine <benoit.taine@...6.fr>
CC:	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 3/18] VMCI: Use kmemdup instead of kmalloc + memcpy



Am 26.05.2014 17:21, schrieb Benoit Taine:
> This issue was reported by coccicheck using the semantic patch 
> at scripts/coccinelle/api/memdup.cocci
> 
> Signed-off-by: Benoit Taine <benoit.taine@...6.fr>
> ---
> Tested by compilation without errors.
> 
>  drivers/misc/vmw_vmci/vmci_datagram.c |    3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/misc/vmw_vmci/vmci_datagram.c b/drivers/misc/vmw_vmci/vmci_datagram.c
> index f3cdd90..d93b469 100644
> --- a/drivers/misc/vmw_vmci/vmci_datagram.c
> +++ b/drivers/misc/vmw_vmci/vmci_datagram.c
> @@ -276,11 +276,10 @@ static int dg_dispatch_as_host(u32 context_id, struct vmci_datagram *dg)
>  		}
>  
>  		/* We make a copy to enqueue. */
> -		new_dg = kmalloc(dg_size, GFP_KERNEL);
> +		new_dg = kmemdup(dg, dg_size, GFP_KERNEL);
>  		if (new_dg == NULL)
>  			return VMCI_ERROR_NO_MEM;


i can not see much of the code but this looks like
  new_dg=dg;
what is possible in c99.

re,
 wh

>  
> -		memcpy(new_dg, dg, dg_size);
>  		retval = vmci_ctx_enqueue_datagram(dg->dst.context, new_dg);
>  		if (retval < VMCI_SUCCESS) {
>  			kfree(new_dg);
> 
> --
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