linux-kernel - [101/114] Staging: batman-adv: Dont write in not allocated packet

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Date:	Tue, 24 Aug 2010 15:45:46 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Sven Eckelmann <sven.eckelmann@....de>
Subject: [101/114] Staging: batman-adv: Dont write in not allocated packet_buff

2.6.35-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Sven Eckelmann <sven.eckelmann@....de>

commit f86b9984250fa2b71ce36d4693a939a58579583b upstream.

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@....de>
Reported-by: Kazuki Shimada <zukky@...banban.jp>
Signed-off-by: Sven Eckelmann <sven.eckelmann@....de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/staging/batman-adv/hard-interface.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/staging/batman-adv/hard-interface.c
+++ b/drivers/staging/batman-adv/hard-interface.c
@@ -128,6 +128,9 @@ static bool hardif_is_iface_up(struct ba
 
 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,
@@ -338,6 +341,7 @@ static struct batman_if *hardif_add_inte
 	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);


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