diff options
author | David S. Miller | 2011-10-24 18:18:09 -0400 |
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committer | David S. Miller | 2011-10-24 18:18:09 -0400 |
commit | 1805b2f04855f07afe3a71d620a68f483b0ed74f (patch) | |
tree | b823b90f37f5404fcaef70f785c70112ca74a329 /drivers/net/ppp/pptp.c | |
parent | 78d81d15b74246c7cedf84894434890b33da3907 (diff) | |
parent | f42af6c486aa5ca6ee62800cb45c5b252020509d (diff) |
Merge branch 'master' of ra.kernel.org:/pub/scm/linux/kernel/git/davem/net
Diffstat (limited to 'drivers/net/ppp/pptp.c')
-rw-r--r-- | drivers/net/ppp/pptp.c | 22 |
1 files changed, 14 insertions, 8 deletions
diff --git a/drivers/net/ppp/pptp.c b/drivers/net/ppp/pptp.c index eae542a7e987..89f829f5f725 100644 --- a/drivers/net/ppp/pptp.c +++ b/drivers/net/ppp/pptp.c @@ -285,8 +285,10 @@ static int pptp_xmit(struct ppp_channel *chan, struct sk_buff *skb) ip_send_check(iph); ip_local_out(skb); + return 1; tx_error: + kfree_skb(skb); return 1; } @@ -305,11 +307,18 @@ static int pptp_rcv_core(struct sock *sk, struct sk_buff *skb) } header = (struct pptp_gre_header *)(skb->data); + headersize = sizeof(*header); /* test if acknowledgement present */ if (PPTP_GRE_IS_A(header->ver)) { - __u32 ack = (PPTP_GRE_IS_S(header->flags)) ? - header->ack : header->seq; /* ack in different place if S = 0 */ + __u32 ack; + + if (!pskb_may_pull(skb, headersize)) + goto drop; + header = (struct pptp_gre_header *)(skb->data); + + /* ack in different place if S = 0 */ + ack = PPTP_GRE_IS_S(header->flags) ? header->ack : header->seq; ack = ntohl(ack); @@ -318,21 +327,18 @@ static int pptp_rcv_core(struct sock *sk, struct sk_buff *skb) /* also handle sequence number wrap-around */ if (WRAPPED(ack, opt->ack_recv)) opt->ack_recv = ack; + } else { + headersize -= sizeof(header->ack); } - /* test if payload present */ if (!PPTP_GRE_IS_S(header->flags)) goto drop; - headersize = sizeof(*header); payload_len = ntohs(header->payload_len); seq = ntohl(header->seq); - /* no ack present? */ - if (!PPTP_GRE_IS_A(header->ver)) - headersize -= sizeof(header->ack); /* check for incomplete packet (length smaller than expected) */ - if (skb->len - headersize < payload_len) + if (!pskb_may_pull(skb, headersize + payload_len)) goto drop; payload = skb->data + headersize; |