pskb_may_pull() returns 1 on success and 0 in case of failure, therefore checking for the return value being negative does not make sense at all.
This way if the function fails we will probably read beyond the current skb data buffer. Fix this by doing the proper check.
Signed-off-by: Antonio Quartulli antonio@meshcoding.com Signed-off-by: Marek Lindner mareklindner@neomailbox.ch --- net/batman-adv/routing.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c index 1ed9f7c..c26f073 100644 --- a/net/batman-adv/routing.c +++ b/net/batman-adv/routing.c @@ -688,7 +688,7 @@ static int batadv_check_unicast_ttvn(struct batadv_priv *bat_priv, int is_old_ttvn;
/* check if there is enough data before accessing it */ - if (pskb_may_pull(skb, hdr_len + ETH_HLEN) < 0) + if (!pskb_may_pull(skb, hdr_len + ETH_HLEN)) return 0;
/* create a copy of the skb (in case of for re-routing) to modify it. */