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| author | Haishuang Yan <yanhaishuang@cmss.chinamobile.com> | 2016-04-03 22:09:24 +0800 |
|---|---|---|
| committer | Sasha Levin <sasha.levin@oracle.com> | 2016-07-12 08:47:43 -0400 |
| commit | 6eebc66dba8331624cc45d65af5a7aeffe9319a6 (patch) | |
| tree | b43fcaa386611ce629ecb4f7ff34214f93c9e96f /net/l2tp | |
| parent | 1f0b56ff5361768123488667d0051f280dd91b14 (diff) | |
| download | linux-stable-6eebc66dba8331624cc45d65af5a7aeffe9319a6.tar.gz linux-stable-6eebc66dba8331624cc45d65af5a7aeffe9319a6.tar.bz2 linux-stable-6eebc66dba8331624cc45d65af5a7aeffe9319a6.zip | |
ipv6: l2tp: fix a potential issue in l2tp_ip6_recv
[ Upstream commit be447f305494e019dfc37ea4cdf3b0e4200b4eba ]
pskb_may_pull() can change skb->data, so we have to load ptr/optr at the
right place.
Signed-off-by: Haishuang Yan <yanhaishuang@cmss.chinamobile.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Diffstat (limited to 'net/l2tp')
| -rw-r--r-- | net/l2tp/l2tp_ip6.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/net/l2tp/l2tp_ip6.c b/net/l2tp/l2tp_ip6.c index 38658826175c..b8e469b832df 100644 --- a/net/l2tp/l2tp_ip6.c +++ b/net/l2tp/l2tp_ip6.c @@ -135,12 +135,11 @@ static int l2tp_ip6_recv(struct sk_buff *skb) struct l2tp_tunnel *tunnel = NULL; int length; - /* Point to L2TP header */ - optr = ptr = skb->data; - if (!pskb_may_pull(skb, 4)) goto discard; + /* Point to L2TP header */ + optr = ptr = skb->data; session_id = ntohl(*((__be32 *) ptr)); ptr += 4; @@ -168,6 +167,9 @@ static int l2tp_ip6_recv(struct sk_buff *skb) if (!pskb_may_pull(skb, length)) goto discard; + /* Point to L2TP header */ + optr = ptr = skb->data; + ptr += 4; pr_debug("%s: ip recv\n", tunnel->name); print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, ptr, length); } |