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net: ipconfig: Fix NULL pointer dereference on RARP/BOOTP/DHCP timeout 

If no RARP, BOOTP, or DHCP response is received, ic_dev is never set,
causing a NULL pointer dereference in ic_close_devs():

    Sending DHCP requests ...... timed out!
    Unable to handle kernel NULL pointer dereference at virtual address 00000004

To fix this, add a check to avoid dereferencing ic_dev if it is still
NULL.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Fixes: 2647cffb2b ("net: ipconfig: Support using "delayed" DHCP replies")
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Geert Uytterhoeven 2016-08-22 15:01:03 +02:00 committed by David S. Miller
parent 8b7ac60a5d
commit 1ae292a245
1 changed files with 1 additions and 1 deletions
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2
net/ipv4/ipconfig.c
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@ -306,7 +306,7 @@ static void __init ic_close_devs(void)
while ((d = next)) {
next = d->next;
dev = d->dev;
if (dev != ic_dev->dev && !netdev_uses_dsa(dev)) {
if ((!ic_dev || dev != ic_dev->dev) && !netdev_uses_dsa(dev)) {
pr_debug("IP-Config: Downing %s\n", dev->name);
dev_change_flags(dev, d->flags);
}