batman-adv: Unify fragment size calculation

The fragmentation code was replaced in 610bfc6bc99bc83680d190ebc69359a05fc7f605
("batman-adv: Receive fragmented packets and merge") by an implementation which
can handle up to 16 fragments of a packet. The packet is prepared for the split
in fragments by the function batadv_frag_send_packet and the actual split is
done by batadv_frag_create.

Both functions calculate the size of a fragment themself. But their calculation
differs because batadv_frag_send_packet also subtracts ETH_HLEN. Therefore,
the check in batadv_frag_send_packet "can a full fragment can be created?" may
return true even when batadv_frag_create cannot create a full fragment.

The function batadv_frag_create doesn't check the size of the skb before
splitting it and therefore might try to create a larger fragment than the
remaining buffer. This creates an integer underflow and an invalid len is given
to skb_split.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/batman-adv/fragmentation.c b/net/batman-adv/fragmentation.c
index 8af3461..00f9e14 100644 (file)
--- a/net/batman-adv/fragmentation.c
+++ b/net/batman-adv/fragmentation.c
@@ -434,7 +434,7 @@ bool batadv_frag_send_packet(struct sk_buff *skb,
         * fragments larger than BATADV_FRAG_MAX_FRAG_SIZE
         */
        mtu = min_t(unsigned, mtu, BATADV_FRAG_MAX_FRAG_SIZE);
-       max_fragment_size = (mtu - header_size - ETH_HLEN);
+       max_fragment_size = mtu - header_size;
        max_packet_size = max_fragment_size * BATADV_FRAG_MAX_FRAGMENTS;
 
        /* Don't even try to fragment, if we need more than 16 fragments */