Messages in this thread Patch in this message | | | From | Geert Uytterhoeven <> | Subject | [PATCH] net: ipconfig: Fix NULL pointer dereference on RARP/BOOTP/DHCP timeout | Date | Mon, 22 Aug 2016 15:01:03 +0200 |
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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") --- net/ipv4/ipconfig.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/ipv4/ipconfig.c b/net/ipv4/ipconfig.c index ba9cbeafbb2e0817..071a785c65eb7ab5 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); } -- 1.9.1
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