Hello Glen Lee,
This is a semi-automatic email about new static checker warnings.
The patch 4ad81fd6125f: "staging: wilc1000: GetIfHandler: add
argument struct wilc and use it" from Oct 27, 2015, leads to the
following Smatch complaint:
drivers/staging/wilc1000/linux_wlan.c:1590 frmw_to_linux()
warn: variable dereferenced before check 'wilc' (see line 1571)
drivers/staging/wilc1000/linux_wlan.c
1570
1571 wilc_netdev = GetIfHandler(wilc, buff);
^^^^
New dereference (inside the function call).
1572 if (wilc_netdev == NULL)
1573 return;
1574
1575 buff += pkt_offset;
1576 nic = netdev_priv(wilc_netdev);
1577
1578 if (size > 0) {
1579
1580 frame_len = size;
1581 buff_to_send = buff;
1582
1583 /* Need to send the packet up to the host, allocate a
skb buffer */
1584 skb = dev_alloc_skb(frame_len);
1585 if (skb == NULL) {
1586 PRINT_ER("Low memory - packet droped\n");
1587 return;
1588 }
1589
1590 if (wilc == NULL || wilc_netdev == NULL)
^^^^^^^^^^^^
Old code assumes wilc can be NULL.
1591 PRINT_ER("wilc_netdev in wilc is NULL");
1592 skb->dev = wilc_netdev;
regards,
dan carpenter
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