netdev - Re: [net-next 11/14] i40e: handle possible memory allocation failure

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Message-ID: <552E4B3C.60002@cogentembedded.com>
Date:	Wed, 15 Apr 2015 14:27:56 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>, davem@...emloft.net
CC:	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	netdev@...r.kernel.org, nhorman@...hat.com, sassmann@...hat.com,
	jogreene@...hat.com
Subject: Re: [net-next 11/14] i40e: handle possible memory allocation failure

Hello.

On 4/15/2015 7:51 AM, Jeff Kirsher wrote:

> From: Jesse Brandeburg <jesse.brandeburg@...el.com>

> The init_interrupt_scheme function had a possible failure
> path to allocate memory that was found by smatch.

> This adds the correct handling to the function to abort
> probe if the memory allocation fails.

> Change-ID: I2bf1d826a244209619da4c452d0d58b3eb5e26a3
> Signed-off-by: Jesse Brandeburg <jesse.brandeburg@...el.com>
> Tested-by: Jim Young <james.m.young@...el.com>
> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
> ---
>   drivers/net/ethernet/intel/i40e/i40e_main.c | 14 +++++++++++---
>   1 file changed, 11 insertions(+), 3 deletions(-)

> diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
> index 63de3f4..b297294 100644
> --- a/drivers/net/ethernet/intel/i40e/i40e_main.c
> +++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
[...]
> @@ -7343,11 +7343,17 @@ static void i40e_init_interrupt_scheme(struct i40e_pf *pf)
>   	/* set up vector assignment tracking */
>   	size = sizeof(struct i40e_lump_tracking) + (sizeof(u16) * vectors);
>   	pf->irq_pile = kzalloc(size, GFP_KERNEL);
> +	if (!pf->irq_pile) {
> +		dev_err(&pf->pdev->dev, "error allocating irq_pile memory\n");

    No need for error message, a call trace will be printed on failed 
allocation anyway.

[...]

WBR, Sergei

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