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| author | David S. Miller <davem@sunset.davemloft.net> | 2006-04-20 07:10:50 (GMT) |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2006-04-20 07:10:50 (GMT) |
| commit | dc6de33674608f978ec29f5c2f7e3af458c06f78 (patch) | |
| tree | 1b314717cdb27cf75478c13f85249f85f6997f48 /net | |
| parent | b60b49ea6a3e1f8dcaf4148dad0daab61ab766d2 (diff) | |
| download | linux-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')
| -rw-r--r-- | net/core/skbuff.c | 8 | ||||
| -rw-r--r-- | net/core/stream.c | 1 |
2 files changed, 9 insertions, 0 deletions
diff --git a/net/core/skbuff.c b/net/core/skbuff.c index 09464fa..fb3770f 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 35e2525..e948969 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; } |