[PATCH 2/7] [PPP] pppoe: Fix data clobbering in __pppoe_xmit and return value
From: Herbert Xu <herbert@gondor.apana.org.au>
Date: 2007-08-31 09:11:33
Subsystem:
networking drivers, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
Possibly related (same subject, not in this thread)
- 2007-09-16 · Re: [PATCH 2/7] [PPP] pppoe: Fix data clobbering in __pppoe_xmit and return value · David Miller <davem@davemloft.net>
[PPP] pppoe: Fix data clobbering in __pppoe_xmit and return value The function __pppoe_xmit modifies the skb data and therefore it needs to copy and skb data if it's cloned. In fact, it currently allocates a new skb so that it can return 0 in case of error without freeing the original skb. This is totally wrong because returning zero is meant to indicate congestion whereupon pppoe is supposed to wake up the upper layer once the congestion subsides. This makes sense for ppp_async and ppp_sync but is out-of-place for pppoe. This patch makes it always return 1 and free the skb. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> --- drivers/net/pppoe.c | 50 +++++++++++++------------------------------------- 1 files changed, 13 insertions(+), 37 deletions(-)
diff --git a/drivers/net/pppoe.c b/drivers/net/pppoe.c
index 5ac3eff..8818253 100644
--- a/drivers/net/pppoe.c
+++ b/drivers/net/pppoe.c@@ -850,9 +850,7 @@ static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb) struct net_device *dev = po->pppoe_dev; struct pppoe_hdr hdr; struct pppoe_hdr *ph; - int headroom = skb_headroom(skb); int data_len = skb->len; - struct sk_buff *skb2; if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) goto abort;
@@ -866,53 +864,31 @@ static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb) if (!dev) goto abort; - /* Copy the skb if there is no space for the header. */ - if (headroom < (sizeof(struct pppoe_hdr) + dev->hard_header_len)) { - skb2 = dev_alloc_skb(32+skb->len + - sizeof(struct pppoe_hdr) + - dev->hard_header_len); - - if (skb2 == NULL) - goto abort; - - skb_reserve(skb2, dev->hard_header_len + sizeof(struct pppoe_hdr)); - skb_copy_from_linear_data(skb, skb_put(skb2, skb->len), - skb->len); - } else { - /* Make a clone so as to not disturb the original skb, - * give dev_queue_xmit something it can free. - */ - skb2 = skb_clone(skb, GFP_ATOMIC); - - if (skb2 == NULL) - goto abort; - } + /* Copy the data if there is no space for the header or if it's + * read-only. + */ + if (skb_cow(skb, sizeof(*ph) + dev->hard_header_len)) + goto abort; - ph = (struct pppoe_hdr *) skb_push(skb2, sizeof(struct pppoe_hdr)); + ph = (struct pppoe_hdr *) skb_push(skb, sizeof(struct pppoe_hdr)); memcpy(ph, &hdr, sizeof(struct pppoe_hdr)); - skb2->protocol = __constant_htons(ETH_P_PPP_SES); + skb->protocol = __constant_htons(ETH_P_PPP_SES); - skb_reset_network_header(skb2); + skb_reset_network_header(skb); - skb2->dev = dev; + skb->dev = dev; - dev->hard_header(skb2, dev, ETH_P_PPP_SES, + dev->hard_header(skb, dev, ETH_P_PPP_SES, po->pppoe_pa.remote, NULL, data_len); - /* We're transmitting skb2, and assuming that dev_queue_xmit - * will free it. The generic ppp layer however, is expecting - * that we give back 'skb' (not 'skb2') in case of failure, - * but free it in case of success. - */ - - if (dev_queue_xmit(skb2) < 0) + if (dev_queue_xmit(skb) < 0) goto abort; - kfree_skb(skb); return 1; abort: - return 0; + kfree_skb(skb); + return 1; }