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authorDavid S. Miller <davem@sunset.davemloft.net>2006-04-20 11:10:50 +0400
committerDavid S. Miller <davem@sunset.davemloft.net>2006-04-20 11:10:50 +0400
commitdc6de33674608f978ec29f5c2f7e3af458c06f78 (patch)
tree1b314717cdb27cf75478c13f85249f85f6997f48 /net/core
parentb60b49ea6a3e1f8dcaf4148dad0daab61ab766d2 (diff)
downloadlinux-dc6de33674608f978ec29f5c2f7e3af458c06f78.tar.xz
[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 <davem@davemloft.net>
Diffstat (limited to 'net/core')
-rw-r--r--net/core/skbuff.c8
-rw-r--r--net/core/stream.c1
2 files changed, 9 insertions, 0 deletions
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;
}