src/patches/suse-2.6.27.25/patches.kabi/abi-add-back-skb_truesize_bug-and-skb_truesize_check.patch

   1 From: Greg Kroah-Hartman <gregkh@suse.de>
   2 Subject: ABI: add back skb_truesize_bug() and skb_truesize_check()
   3
   4 These functions were removed in 2.6.27.20 as they are broken and don't
   5 really work properly.
   6
   7 But, some foolish external modules might actually be using them, so be
   8 safe and put them back in, but do not put back in the internal network
   9 checks that called them, as that's not needed.
  10
  11 Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
  12
  13 ---
  14  include/linux/skbuff.h |    9 +++++++++
  15  net/core/skbuff.c      |    8 ++++++++
  16  2 files changed, 17 insertions(+)
  17
  18 --- a/include/linux/skbuff.h
  19 +++ b/include/linux/skbuff.h
  20 @@ -395,6 +395,15 @@ extern void              skb_over_panic(struct
  21                                      void *here);
  22  extern void          skb_under_panic(struct sk_buff *skb, int len,
  23                                       void *here);
  24 +extern void          skb_truesize_bug(struct sk_buff *skb);
  25 +
  26 +static inline void skb_truesize_check(struct sk_buff *skb)
  27 +{
  28 +       int len = sizeof(struct sk_buff) + skb->len;
  29 +
  30 +       if (unlikely((int)skb->truesize < len))
  31 +               skb_truesize_bug(skb);
  32 +}
  33
  34  extern int skb_append_datato_frags(struct sock *sk, struct sk_buff *skb,
  35                         int getfrag(void *from, char *to, int offset,
  36 --- a/net/core/skbuff.c
  37 +++ b/net/core/skbuff.c
  38 @@ -143,6 +143,14 @@ void skb_under_panic(struct sk_buff *skb
  39         BUG();
  40  }
  41
  42 +void skb_truesize_bug(struct sk_buff *skb)
  43 +{
  44 +       printk(KERN_ERR "SKB BUG: Invalid truesize (%u) "
  45 +              "len=%u, sizeof(sk_buff)=%Zd\n",
  46 +              skb->truesize, skb->len, sizeof(struct sk_buff));
  47 +}
  48 +EXPORT_SYMBOL(skb_truesize_bug);
  49 +
  50  /*     Allocate a new skbuff. We do this ourselves so we can fill in a few
  51   *     'private' fields and also do memory statistics to find all the
  52   *     [BEEP] leaks.