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authorGlenn Ruben Bakke <glennrubenbakke@nordicsemi.no>2016-04-22 18:06:11 +0200
committerMarcel Holtmann <marcel@holtmann.org>2016-04-26 01:08:25 +0200
commit55441070ca1cbd47ce1ad2959bbf4b47aed9b83b (patch)
tree520b1520d798b485a4fafcda388331ac23c65027
parent5c0e03cd9f10d541b69b667a2b1b8980f196f432 (diff)
Bluetooth: 6lowpan: Fix memory corruption of ipv6 destination address
The memcpy of ipv6 header destination address to the skb control block (sbk->cb) in header_create() results in currupted memory when bt_xmit() is issued. The skb->cb is "released" in the return of header_create() making room for lower layer to minipulate the skb->cb. The value retrieved in bt_xmit is not persistent across header creation and sending, and the lower layer will overwrite portions of skb->cb, making the copied destination address wrong. The memory corruption will lead to non-working multicast as the first 4 bytes of the copied destination address is replaced by a value that resolves into a non-multicast prefix. This fix removes the dependency on the skb control block between header creation and send, by moving the destination address memcpy to the send function path (setup_create, which is called from bt_xmit). Signed-off-by: Glenn Ruben Bakke <glenn.ruben.bakke@nordicsemi.no> Acked-by: Jukka Rissanen <jukka.rissanen@linux.intel.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org> Cc: stable@vger.kernel.org # 4.5+
-rw-r--r--net/bluetooth/6lowpan.c11
1 files changed, 4 insertions, 7 deletions
diff --git a/net/bluetooth/6lowpan.c b/net/bluetooth/6lowpan.c
index 38e82ddd7ccd..780089d75915 100644
--- a/net/bluetooth/6lowpan.c
+++ b/net/bluetooth/6lowpan.c
@@ -434,15 +434,18 @@ static int setup_header(struct sk_buff *skb, struct net_device *netdev,
bdaddr_t *peer_addr, u8 *peer_addr_type)
{
struct in6_addr ipv6_daddr;
+ struct ipv6hdr *hdr;
struct lowpan_btle_dev *dev;
struct lowpan_peer *peer;
bdaddr_t addr, *any = BDADDR_ANY;
u8 *daddr = any->b;
int err, status = 0;
+ hdr = ipv6_hdr(skb);
+
dev = lowpan_btle_dev(netdev);
- memcpy(&ipv6_daddr, &lowpan_cb(skb)->addr, sizeof(ipv6_daddr));
+ memcpy(&ipv6_daddr, &hdr->daddr, sizeof(ipv6_daddr));
if (ipv6_addr_is_multicast(&ipv6_daddr)) {
lowpan_cb(skb)->chan = NULL;
@@ -492,15 +495,9 @@ static int header_create(struct sk_buff *skb, struct net_device *netdev,
unsigned short type, const void *_daddr,
const void *_saddr, unsigned int len)
{
- struct ipv6hdr *hdr;
-
if (type != ETH_P_IPV6)
return -EINVAL;
- hdr = ipv6_hdr(skb);
-
- memcpy(&lowpan_cb(skb)->addr, &hdr->daddr, sizeof(struct in6_addr));
-
return 0;
}