Re: [PATCH] Check if skb_alloc returns Null in function fw_download_code

From: Dave Jones
Date: Tue Jun 17 2014 - 00:20:45 EST


On Mon, Jun 16, 2014 at 09:07:45PM -0700, Greg KH wrote:
> On Mon, Jun 16, 2014 at 11:23:13PM -0400, Nicholas Krause wrote:
> > Signed-off-by: Nicholas Krause <xerofoify@xxxxxxxxx>
> > ---
> > drivers/staging/rtl8192e/rtl8192e/r8192E_firmware.c | 2 ++
> > 1 file changed, 2 insertions(+)
> >
> > diff --git a/drivers/staging/rtl8192e/rtl8192e/r8192E_firmware.c b/drivers/staging/rtl8192e/rtl8192e/r8192E_firmware.c
> > index 1a95d1f..11e915e 100644
> > --- a/drivers/staging/rtl8192e/rtl8192e/r8192E_firmware.c
> > +++ b/drivers/staging/rtl8192e/rtl8192e/r8192E_firmware.c
> > @@ -61,11 +61,13 @@ static bool fw_download_code(struct net_device *dev, u8 *code_virtual_address,
> > }
> >
> > skb = dev_alloc_skb(frag_length + 4);
> > + if (!skb) {
> > memcpy((unsigned char *)(skb->cb), &dev, sizeof(dev));
> > tcb_desc = (struct cb_desc *)(skb->cb + MAX_DEV_ADDR_SIZE);
> > tcb_desc->queue_index = TXCMD_QUEUE;
> > tcb_desc->bCmdOrInit = DESC_PACKET_TYPE_INIT;
> > tcb_desc->bLastIniPkt = bLastIniPkt;
> > + }
> >
>
> Please run your patches through scripts/checkpatch.pl to find the errors
> before sending them out and having someone else point them out to you...

I suspect checkpatch would pick up the indentation mess, but
indentation is the least of this patch's problems.

if that alloc_skb fails, going around the loop again is pointless, and
harmful. (we'll oops right below that added bracket).

on failure, this should be returning 0 so that the caller
handles the failure appropriately.

Dave

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/