From dc6de33674608f978ec29f5c2f7e3af458c06f78 Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Thu, 20 Apr 2006 00:10:50 -0700 Subject: [NET]: Add skb->truesize assertion checking. Add some sanity checking. truesize should be at least sizeof(struct sk_buff) plus the current packet length. If not, then truesize is seriously mangled and deserves a kernel log message. Currently we'll do the check for release of stream socket buffers. But we can add checks to more spots over time. Incorporating ideas from Herbert Xu. Signed-off-by: David S. Miller --- include/linux/skbuff.h | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'include/linux/skbuff.h') diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index c4619a428d9..f8f234708b9 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -344,6 +344,13 @@ extern void skb_over_panic(struct sk_buff *skb, int len, void *here); extern void skb_under_panic(struct sk_buff *skb, int len, void *here); +extern void skb_truesize_bug(struct sk_buff *skb); + +static inline void skb_truesize_check(struct sk_buff *skb) +{ + if (unlikely((int)skb->truesize < sizeof(struct sk_buff) + skb->len)) + skb_truesize_bug(skb); +} extern int skb_append_datato_frags(struct sock *sk, struct sk_buff *skb, int getfrag(void *from, char *to, int offset, -- cgit v1.2.3