diff options
| author | Eric Dumazet <eric.dumazet@gmail.com> | 2012-02-23 10:55:02 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-02-23 16:50:45 -0500 |
| commit | 03606895cd98c0a628b17324fd7b5ff15db7e3cd (patch) | |
| tree | 26aab95243f23a5d0cff45ee0d6afd1608afe5df /include | |
| parent | 4a2258ddddefeef3291c0fc66437c73d84261a1e (diff) | |
| download | linux-03606895cd98c0a628b17324fd7b5ff15db7e3cd.tar.gz linux-03606895cd98c0a628b17324fd7b5ff15db7e3cd.tar.bz2 linux-03606895cd98c0a628b17324fd7b5ff15db7e3cd.zip | |
ipsec: be careful of non existing mac headers
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>
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 50db9b04a552..ae86adee3746 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -1465,6 +1465,16 @@ 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_checksum_start_offset(const struct sk_buff *skb) { return skb->csum_start - skb_headroom(skb); |