Whenever we want to access headers only, we do not need to linearise the whole packet. Instead we can use pskb_may_pull()
Signed-off-by: Antonio Quartulli ordex@autistici.org --- net/batman-adv/routing.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c index 7ed9d8f..4c6467d 100644 --- a/net/batman-adv/routing.c +++ b/net/batman-adv/routing.c @@ -916,8 +916,9 @@ static int check_unicast_ttvn(struct bat_priv *bat_priv,
/* Check whether I have to reroute the packet */ if (seq_before(unicast_packet->ttvn, curr_ttvn) || tt_poss_change) { - /* Linearize the skb before accessing it */ - if (skb_linearize(skb) < 0) + /* check if there is enough data before accessing it */ + if (pskb_may_pull(skb, sizeof(struct unicast_packet) + + ETH_HLEN) < 0) return 0;
ethhdr = (struct ethhdr *)(skb->data +