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 --- net/core/skbuff.c | 8 ++++++++ net/core/stream.c | 1 + 2 files changed, 9 insertions(+) (limited to 'net/core') diff --git a/net/core/skbuff.c b/net/core/skbuff.c index 09464fa8d72f..fb3770f9c094 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -112,6 +112,14 @@ void skb_under_panic(struct sk_buff *skb, int sz, void *here) BUG(); } +void skb_truesize_bug(struct sk_buff *skb) +{ + printk(KERN_ERR "SKB BUG: Invalid truesize (%u) " + "len=%u, sizeof(sk_buff)=%Zd\n", + skb->truesize, skb->len, sizeof(struct sk_buff)); +} +EXPORT_SYMBOL(skb_truesize_bug); + /* Allocate a new skbuff. We do this ourselves so we can fill in a few * 'private' fields and also do memory statistics to find all the * [BEEP] leaks. diff --git a/net/core/stream.c b/net/core/stream.c index 35e25259fd95..e9489696f694 100644 --- a/net/core/stream.c +++ b/net/core/stream.c @@ -176,6 +176,7 @@ void sk_stream_rfree(struct sk_buff *skb) { struct sock *sk = skb->sk; + skb_truesize_check(skb); atomic_sub(skb->truesize, &sk->sk_rmem_alloc); sk->sk_forward_alloc += skb->truesize; } -- cgit v1.2.3