diff options
| author | Eric Dumazet <eric.dumazet@gmail.com> | 2012-02-23 10:55:02 +0000 |
|---|---|---|
| committer | Willy Tarreau <w@1wt.eu> | 2012-10-07 23:37:32 +0200 |
| commit | d67f05eb15321bcfaa62d544a0f11d0015736caf (patch) | |
| tree | b12fa7d187f55e8f5aa7c0a0a82750967fa0bd79 /include | |
| parent | 3a40b4fe7b6f8b25ac3dc7af13e374ca56d9dfc8 (diff) | |
ipsec: be careful of non existing mac headers
[ Upstream commit 03606895cd98c0a628b17324fd7b5ff15db7e3cd ]
Niccolo Belli reported ipsec crashes in case we handle a frame without
mac header (atm in his case)
Before copying mac header, better make sure it is present.
Bugzilla reference: https://bugzilla.kernel.org/show_bug.cgi?id=42809
Reported-by: Niccolò Belli <darkbasic@linuxsystems.it>
Tested-by: Niccolò Belli <darkbasic@linuxsystems.it>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/skbuff.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index bcdd6606f468..4e647bbda2dd 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -1312,6 +1312,16 @@ static inline void skb_set_mac_header(struct sk_buff *skb, const int offset) } #endif /* NET_SKBUFF_DATA_USES_OFFSET */ +static inline void skb_mac_header_rebuild(struct sk_buff *skb) +{ + if (skb_mac_header_was_set(skb)) { + const unsigned char *old_mac = skb_mac_header(skb); + + skb_set_mac_header(skb, -skb->mac_len); + memmove(skb_mac_header(skb), old_mac, skb->mac_len); + } +} + static inline int skb_transport_offset(const struct sk_buff *skb) { return skb_transport_header(skb) - skb->data; |