linux-kernel - Re: [PATCH] staging: dgnc: check if kzalloc fails in dgnc_tty

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Message-ID: <20150407104110.GB28119@sudip-PC>
Date:	Tue, 7 Apr 2015 16:11:10 +0530
From:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:	Giedrius Statkevičius 
	<giedrius.statkevicius@...il.com>
Cc:	lidza.louina@...il.com, markh@...pro.net,
	gregkh@...uxfoundation.org, driverdev-devel@...uxdriverproject.org,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: dgnc: check if kzalloc fails in dgnc_tty_init()

On Tue, Apr 07, 2015 at 01:26:32PM +0300, Giedrius Statkevičius wrote:
> kzalloc() could fail so add a check and return -ENOMEM if it does that gets
> propogated to the pci layer
> 
> Signed-off-by: Giedrius Statkevičius <giedrius.statkevicius@...il.com>
> ---
>  drivers/staging/dgnc/dgnc_tty.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/staging/dgnc/dgnc_tty.c b/drivers/staging/dgnc/dgnc_tty.c
> index 61d5a8e..23337da 100644
> --- a/drivers/staging/dgnc/dgnc_tty.c
> +++ b/drivers/staging/dgnc/dgnc_tty.c
> @@ -311,6 +311,8 @@ int dgnc_tty_init(struct dgnc_board *brd)
>  			 * interrupt context, and there are no locks held.
>  			 */
>  			brd->channels[i] = kzalloc(sizeof(*brd->channels[i]), GFP_KERNEL);
> +			if (!brd->channels[i])
> +				return -ENOMEM;
won't this create memory leak ?
suppose you have brd->nasync = 3 
and kzalloc fails when i=2, and you return -ENOMEM,
then what happens to the memory already allocated to brd->channels[0]
and brd->channels[1] ?

regards
sudip
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