netdev - [PATCH 1/7] [PPP] pppoe: Fix skb_unshare

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Fri, 31 Aug 2007 17:11:30 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	James Chapman <jchapman@...alix.com>,
	"David S. Miller" <davem@...emloft.net>,
	Michal Ostrowski <mostrows@...akeasy.net>,
	Paul Mackerras <paulus@...ba.org>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Toralf F?rster <toralf.foerster@....de>, netdev@...r.kernel.org
Subject: [PATCH 1/7] [PPP] pppoe: Fix skb_unshare_check call position

[PPP] pppoe: Fix skb_unshare_check call position

The skb_unshare_check call needs to be made before pskb_may_pull,
not after.

Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
---

 drivers/net/pppoe.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/pppoe.c b/drivers/net/pppoe.c
index 68631a5..5ac3eff 100644
--- a/drivers/net/pppoe.c
+++ b/drivers/net/pppoe.c
@@ -385,12 +385,12 @@ static int pppoe_rcv(struct sk_buff *skb,
 	struct pppoe_hdr *ph;
 	struct pppox_sock *po;
 
-	if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr)))
-		goto drop;
-
 	if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
 		goto out;
 
+	if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr)))
+		goto drop;
+
 	ph = pppoe_hdr(skb);
 
 	po = get_item((unsigned long) ph->sid, eth_hdr(skb)->h_source, dev->ifindex);
-
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html