linux-kernel - Re: [PATCH] thunderbolt: Correct the size argument to devm

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Date:	Sun, 06 Jul 2014 09:31:03 -0700
From:	Joe Perches <joe@...ches.com>
To:	Himangi Saraogi <himangi774@...il.com>
Cc:	linux-kernel@...r.kernel.org, julia.lawall@...6.fr
Subject: Re: [PATCH] thunderbolt: Correct the size argument to devm_kzalloc

On Sun, 2014-07-06 at 21:43 +0530, Himangi Saraogi wrote:
> nhi->rx_rings does not have type as struct tb_ring *, as it is a
> double pointer so the elements of the array should have pointer type,
> not structure type.
[]
> diff --git a/drivers/thunderbolt/nhi.c b/drivers/thunderbolt/nhi.c
[]
> @@ -570,10 +570,10 @@ static int nhi_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>  	INIT_WORK(&nhi->interrupt_work, nhi_interrupt_work);
>  
>  	nhi->tx_rings = devm_kzalloc(&pdev->dev,
> -				     nhi->hop_count * sizeof(struct tb_ring),
> +				     nhi->hop_count * sizeof(*nhi->tx_rings),
>  				     GFP_KERNEL);
>  	nhi->rx_rings = devm_kzalloc(&pdev->dev,
> -				     nhi->hop_count * sizeof(struct tb_ring),
> +				     nhi->hop_count * sizeof(*nhi->rx_rings),
>  				     GFP_KERNEL);

It could use devm_kcalloc here too.

btw: are there many false positives with the cocci test?

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