From: Daniel Borkmann <dborkman@xxxxxxxxxx>
3.12-stable review patch. If anyone has any objections, please let me know.
===============
commit 965801e1eb624154fe5e9dc5d2ff0b7f1951a11c upstream.
In function lowpan_header_create(), we invoke the following code
construct:
struct ipv6hdr *hdr;
...
hdr = ipv6_hdr(skb);
...
if (...)
memcpy(hc06_ptr + 1, &hdr->flow_lbl[1], 2);
else
memcpy(hc06_ptr, &hdr, 4);
Where the else path of the condition, that is, non-compression
path, calls memcpy() with a pointer to struct ipv6hdr *hdr as
source, thus two levels of indirection. This cannot be correct,
and likely only one level of pointer was intended as source
buffer for memcpy() here.
Fixes: 44331fe2aa0d ("IEEE802.15.4: 6LoWPAN basic support")
Signed-off-by: Daniel Borkmann <dborkman@xxxxxxxxxx>
Cc: Alexander Smirnov <alex.bluesman.smirnov@xxxxxxxxx>
Cc: Dmitry Eremin-Solenikov <dbaryshkov@xxxxxxxxx>
Cc: Werner Almesberger <werner@xxxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
net/ieee802154/6lowpan.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/ieee802154/6lowpan.c b/net/ieee802154/6lowpan.c
index 70348be444c1..a377d435756e 100644
--- a/net/ieee802154/6lowpan.c
+++ b/net/ieee802154/6lowpan.c
@@ -548,7 +548,7 @@ static int lowpan_header_create(struct sk_buff *skb,
hc06_ptr += 3;
} else {
/* compress nothing */
- memcpy(hc06_ptr, &hdr, 4);
+ memcpy(hc06_ptr, hdr, 4);
/* replace the top byte with new ECN | DSCP format */
*hc06_ptr = tmp;
hc06_ptr += 4;
--
2.12.0