From 965801e1eb624154fe5e9dc5d2ff0b7f1951a11c Mon Sep 17 00:00:00 2001 From: Daniel Borkmann Date: Mon, 6 Jan 2014 01:45:50 +0100 Subject: [PATCH] net: 6lowpan: fix lowpan_header_create non-compression memcpy call 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 Cc: Alexander Smirnov Cc: Dmitry Eremin-Solenikov Cc: Werner Almesberger Signed-off-by: David S. Miller --- 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 459e200c08a4..a2d2456a557a 100644 --- a/net/ieee802154/6lowpan.c +++ b/net/ieee802154/6lowpan.c @@ -547,7 +547,7 @@ 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; -- 2.20.1