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| author |   Geert Uytterhoeven <geert+renesas@glider.be> | 2016-08-22 15:01:03 +0200 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2016-08-22 21:04:41 -0700 |
| commit | 1ae292a2457cd692828da2be87cb967260993ad0 (patch) | |
| tree | 7f8e6b2718168f811a8aebb437c7c7ef62d33662 /net | |
| parent | Merge tag 'batadv-next-for-davem-20160822' of git://git.open-mesh.org/linux-merge (diff) | |
| download | linux-dev-1ae292a2457cd692828da2be87cb967260993ad0.tar.xz linux-dev-1ae292a2457cd692828da2be87cb967260993ad0.zip | |
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: 2647cffb2bc6fbed ("net: ipconfig: Support using "delayed" DHCP replies")
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv4/ipconfig.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/ipconfig.c b/net/ipv4/ipconfig.c index ba9cbeafbb2e..071a785c65eb 100644 --- a/net/ipv4/ipconfig.c +++ b/net/ipv4/ipconfig.c @@ -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); } |