From a91e7d471e2e384035b9746ea707ccdcd353f5dd Mon Sep 17 00:00:00 2001 From: Kumar Sanghvi Date: Mon, 27 Sep 2010 23:10:42 +0000 Subject: Phonet: Correct header retrieval after pskb_may_pull MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Retrieve the header after doing pskb_may_pull since, pskb_may_pull could change the buffer structure. This is based on the comment given by Eric Dumazet on Phonet Pipe controller patch for a similar problem. Signed-off-by: Kumar Sanghvi Acked-by: Linus Walleij Acked-by: Eric Dumazet Acked-by: Rémi Denis-Courmont Signed-off-by: David S. Miller --- net/phonet/pep.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'net/phonet/pep.c') diff --git a/net/phonet/pep.c b/net/phonet/pep.c index b2a3ae6cad7..15003021f4f 100644 --- a/net/phonet/pep.c +++ b/net/phonet/pep.c @@ -225,12 +225,13 @@ static void pipe_grant_credits(struct sock *sk) static int pipe_rcv_status(struct sock *sk, struct sk_buff *skb) { struct pep_sock *pn = pep_sk(sk); - struct pnpipehdr *hdr = pnp_hdr(skb); + struct pnpipehdr *hdr; int wake = 0; if (!pskb_may_pull(skb, sizeof(*hdr) + 4)) return -EINVAL; + hdr = pnp_hdr(skb); if (hdr->data[0] != PN_PEP_TYPE_COMMON) { LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP type: %u\n", (unsigned)hdr->data[0]); -- cgit v1.2.3-70-g09d2