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authorSven Eckelmann <sven.eckelmann@gmx.de>2010-08-21 14:18:10 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2010-08-23 18:15:38 -0700
commitf86b9984250fa2b71ce36d4693a939a58579583b (patch)
tree3eb64c2a22559d122e636171dac50a33c66ae456 /drivers/staging
parent51a00eaf6e008b60943af6ab68c17ac3622208dc (diff)
Staging: batman-adv: Don't write in not allocated packet_buff
Each net_device in a system will automatically managed as a possible batman_if and holds different informations like a buffer with a prepared originator messages. To reduce the memory usage, the packet_buff will only be allocated when the interface is really added/enabled for batman-adv. The function to update the hw address information inside the packet_buff just assumes that the packet_buff is always initialised and thus the kernel will just oops when we try to change the hw address of a not already fully enabled interface. We must always check if the packet_buff is allocated before we try to change information inside of it. Reported-by: Tim Glaremin <Tim.Glaremin@web.de> Reported-by: Kazuki Shimada <zukky@bb.banban.jp> Signed-off-by: Sven Eckelmann <sven.eckelmann@gmx.de> Cc: stable <stable@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/staging')
-rw-r--r--drivers/staging/batman-adv/hard-interface.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/staging/batman-adv/hard-interface.c b/drivers/staging/batman-adv/hard-interface.c
index d08491ed5455..baa8b05b9e8d 100644
--- a/drivers/staging/batman-adv/hard-interface.c
+++ b/drivers/staging/batman-adv/hard-interface.c
@@ -129,6 +129,9 @@ static bool hardif_is_iface_up(struct batman_if *batman_if)
static void update_mac_addresses(struct batman_if *batman_if)
{
+ if (!batman_if || !batman_if->packet_buff)
+ return;
+
addr_to_string(batman_if->addr_str, batman_if->net_dev->dev_addr);
memcpy(((struct batman_packet *)(batman_if->packet_buff))->orig,
@@ -334,6 +337,7 @@ static struct batman_if *hardif_add_interface(struct net_device *net_dev)
batman_if->if_num = -1;
batman_if->net_dev = net_dev;
batman_if->if_status = IF_NOT_IN_USE;
+ batman_if->packet_buff = NULL;
INIT_LIST_HEAD(&batman_if->list);
check_known_mac_addr(batman_if->net_dev->dev_addr);