linux-kernel - drivers/staging/ks7010/ks_hostif.c:504:69-72: ERROR: skb is NULL but dereferenced.

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Message-ID: <201607272135.LKOmr0cY%fengguang.wu@intel.com>
Date:	Wed, 27 Jul 2016 21:07:36 +0800
From:	kbuild test robot <fengguang.wu@...el.com>
To:	unlisted-recipients:; (no To-header on input)
Cc:	kbuild-all@...org, linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Wolfram Sang <wsa+renesas@...g-engineering.com>
Subject: drivers/staging/ks7010/ks_hostif.c:504:69-72: ERROR: skb is NULL but
 dereferenced.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   0e06f5c0deeef0332a5da2ecb8f1fcf3e024d958
commit: 13a9930d15b424ab7d3b906af8ba7ff8c409edfe staging: ks7010: add driver from Nanonote extra-repository
date:   7 weeks ago


coccinelle warnings: (new ones prefixed by >>)

>> drivers/staging/ks7010/ks_hostif.c:504:69-72: ERROR: skb is NULL but dereferenced.
   drivers/staging/ks7010/ks_hostif.c:536:69-72: ERROR: skb is NULL but dereferenced.

vim +504 drivers/staging/ks7010/ks_hostif.c

   488				memcpy(skb_put(skb,rx_ind_size-12),priv->rxp+18,rx_ind_size-12); /* copy after Type */
   489	
   490				aa1x_hdr=(struct ieee802_1x_hdr *)(priv->rxp+20);
   491				if(aa1x_hdr->type == IEEE802_1X_TYPE_EAPOL_KEY  && priv->wpa.rsn_enabled){
   492					eap_key = (struct wpa_eapol_key *)(aa1x_hdr+1);
   493					atomic_set(&priv->psstatus.snooze_guard, 1);
   494				}
   495	
   496				/* rx indication */
   497				skb->dev = priv->net_dev;
   498				skb->protocol = eth_type_trans (skb, skb->dev);
   499				priv->nstats.rx_packets++;
   500				priv->nstats.rx_bytes += rx_ind_size;
   501				skb->dev->last_rx = jiffies;
   502				netif_rx (skb);
   503			} else {
 > 504				printk (KERN_WARNING"%s: Memory squeeze, dropping packet.\n",skb->dev->name);
   505				priv->nstats.rx_dropped++;
   506			}
   507			break;
   508		case 0xF0: /* NETBEUI/NetBIOS */
   509			rx_ind_size = (priv->rx_size + 2);
   510			skb = dev_alloc_skb (rx_ind_size);
   511			DPRINTK(3,"NETBEUI/NetBIOS rx_ind_size=%d\n", rx_ind_size);
   512	

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