UPSTREAM: ipv6: raw: Deduct extension header length in rawv6_push_pending_frames
commit cb3e9864cdbe35ff6378966660edbcbac955fe17 upstream.
The total cork length created by ip6_append_data includes extension
headers, so we must exclude them when comparing them against the
IPV6_CHECKSUM offset which does not include extension headers.
Reported-by: Kyle Zeng <zengyhkyle@gmail.com>
Fixes: 357b40a18b04 ("[IPV6]: IPV6_CHECKSUM socket option can corrupt kernel memory")
Change-Id: I73cf556998cab122229e1a361d186925775aad61
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 35ed8ba485544a31a4ab9b92a1c68e406ab66a47)
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c
index f3caf95..a91e643 100644
--- a/net/ipv6/raw.c
+++ b/net/ipv6/raw.c
@@ -539,6 +539,7 @@
static int rawv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
struct raw6_sock *rp)
{
+ struct ipv6_txoptions *opt;
struct sk_buff *skb;
int err = 0;
int offset;
@@ -556,6 +557,9 @@
offset = rp->offset;
total_len = inet_sk(sk)->cork.base.length;
+ opt = inet6_sk(sk)->cork.opt;
+ total_len -= opt ? opt->opt_flen : 0;
+
if (offset >= total_len - 1) {
err = -EINVAL;
ip6_flush_pending_frames(sk);