linux-kernel - Re: [linux-usb-devel] drivers/usb/gadget/ether.c: NULL dereference

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Date:	Sat, 11 Nov 2006 22:35:48 -0800
From:	David Brownell <david-b@...bell.net>
To:	linux-usb-devel@...ts.sourceforge.net
Cc:	Adrian Bunk <bunk@...sta.de>, greg@...ah.com,
	linux-kernel@...r.kernel.org
Subject: Re: [linux-usb-devel] drivers/usb/gadget/ether.c: NULL dereference

On Saturday 11 November 2006 8:06 am, Adrian Bunk wrote:
> The Coverity checker spotted the following NULL dereference of "skb" in 
> drivers/usb/gadget/ether.c:

I don't see such a dereference.  As usual, free(NULL) is legit.

Is this another case of bogus reports from Coverity?  I still need to
revert a bug in the EHCI debug code caused by someone "fixing" it
because Coverity doesn't understand unions...


> <--  snip  -->
> 
> ...
> static int
> rx_submit (struct eth_dev *dev, struct usb_request *req, gfp_t gfp_flags)
> {
>         struct sk_buff          *skb;
>         int                     retval = -ENOMEM;
> ...
>         if ((skb = alloc_skb (size + NET_IP_ALIGN, gfp_flags)) == 0) {
>                 DEBUG (dev, "no rx skb\n");
>                 goto enomem;
>         }
> ...
> enomem:
>                 defer_kevent (dev, WORK_RX_MEMORY);
>         if (retval) {
>                 DEBUG (dev, "rx submit --> %d\n", retval);
>                 dev_kfree_skb_any (skb);
> ...
> 
> <--  snip  -->
> 
> cu
> Adrian
> 
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