linux-kernel - Re: [PATCH] drivers: net: wireless: atmel: check memory allocation failure

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Message-ID: <20170822092931.GA8490@himanshu-Vostro-3559>
Date:   Tue, 22 Aug 2017 14:59:31 +0530
From:   Himanshu Jha <himanshujha199640@...il.com>
To:     Matteo Croce <mcroce@...hat.com>
Cc:     linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org,
        kvalo@...eaurora.org
Subject: Re: [PATCH] drivers: net: wireless: atmel: check memory allocation
 failure

On Tue, Aug 22, 2017 at 10:41:45AM +0200, Matteo Croce wrote:
> Il giorno mar, 22/08/2017 alle 13.41 +0530, Himanshu Jha ha scritto:
> > Check memory allocation failure and return -ENOMEM if failure
> > occurs.
> > 
> > Signed-off-by: Himanshu Jha <himanshujha199640@...il.com>
> > ---
> >  drivers/net/wireless/atmel/at76c50x-usb.c | 14 +++++++-------
> >  1 file changed, 7 insertions(+), 7 deletions(-)
> > 
> > diff --git a/drivers/net/wireless/atmel/at76c50x-usb.c
> > b/drivers/net/wireless/atmel/at76c50x-usb.c
> > index 09defbc..73f0924 100644
> > --- a/drivers/net/wireless/atmel/at76c50x-usb.c
> > +++ b/drivers/net/wireless/atmel/at76c50x-usb.c
> > @@ -940,7 +940,7 @@ static void at76_dump_mib_mac_addr(struct
> > at76_priv *priv)
> >  					 GFP_KERNEL);
> >  
> >  	if (!m)
> > -		return;
> > +		return -ENOMEM;
> >  
> >  	ret = at76_get_mib(priv->udev, MIB_MAC_ADDR, m,
> >  			   sizeof(struct mib_mac_addr));
> > @@ -969,7 +969,7 @@ static void at76_dump_mib_mac_wep(struct
> > at76_priv *priv)
> >  	struct mib_mac_wep *m = kmalloc(sizeof(struct mib_mac_wep),
> > GFP_KERNEL);
> >  
> >  	if (!m)
> > -		return;
> > +		return -ENOMEM;
> >  
> >  	ret = at76_get_mib(priv->udev, MIB_MAC_WEP, m,
> >  			   sizeof(struct mib_mac_wep));
> > @@ -1006,7 +1006,7 @@ static void at76_dump_mib_mac_mgmt(struct
> > at76_priv *priv)
> >  					 GFP_KERNEL);
> >  
> >  	if (!m)
> > -		return;
> > +		return -ENOMEM;
> >  
> >  	ret = at76_get_mib(priv->udev, MIB_MAC_MGMT, m,
> >  			   sizeof(struct mib_mac_mgmt));
> > @@ -1043,7 +1043,7 @@ static void at76_dump_mib_mac(struct at76_priv
> > *priv)
> >  	struct mib_mac *m = kmalloc(sizeof(struct mib_mac),
> > GFP_KERNEL);
> >  
> >  	if (!m)
> > -		return;
> > +		return -ENOMEM;
> >  
> >  	ret = at76_get_mib(priv->udev, MIB_MAC, m, sizeof(struct
> > mib_mac));
> >  	if (ret < 0) {
> > @@ -1080,7 +1080,7 @@ static void at76_dump_mib_phy(struct at76_priv
> > *priv)
> >  	struct mib_phy *m = kmalloc(sizeof(struct mib_phy),
> > GFP_KERNEL);
> >  
> >  	if (!m)
> > -		return;
> > +		return -ENOMEM;
> >  
> >  	ret = at76_get_mib(priv->udev, MIB_PHY, m, sizeof(struct
> > mib_phy));
> >  	if (ret < 0) {
> > @@ -1113,7 +1113,7 @@ static void at76_dump_mib_local(struct
> > at76_priv *priv)
> >  	struct mib_local *m = kmalloc(sizeof(*m), GFP_KERNEL);
> >  
> >  	if (!m)
> > -		return;
> > +		return -ENOMEM;
> >  
> >  	ret = at76_get_mib(priv->udev, MIB_LOCAL, m, sizeof(*m));
> >  	if (ret < 0) {
> > @@ -1138,7 +1138,7 @@ static void at76_dump_mib_mdomain(struct
> > at76_priv *priv)
> >  	struct mib_mdomain *m = kmalloc(sizeof(struct mib_mdomain),
> > GFP_KERNEL);
> >  
> >  	if (!m)
> > -		return;
> > +		return -ENOMEM;
> >  
> >  	ret = at76_get_mib(priv->udev, MIB_MDOMAIN, m,
> >  			   sizeof(struct mib_mdomain));
> 
> Perhaps these functions should return something instead of being void.
> 
> Regards,
> 
> -- 
> Matteo Croce
> per aspera ad upstream

Yes, it should return int to signal memory allocation failures and
therefore function prototype should be static int rather than static
void.

Thanks!