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    Subject[Patch] dvb-core: Proper handling ULE SNDU length of 0
    From

    ULE (Unidirectional Lightweight Encapsulation RFC 4326) decapsulation code
    has a bug that allows an attacker to send a malformed ULE packet with SNDU
    length of 0 and bring down the receiving machine. This patch fix the bug and
    apply to kernel 2.6.17.8.

    Signed-off-by: Ang Way Chuang <wcang@nrg.cs.usm.my>
    ---

    diff -uprN linux-2.6.17.8/drivers/media/dvb/dvb-core/dvb_net.c linux-2.6.17.8-fix/drivers/media/dvb/dvb-core/dvb_net.c
    --- linux-2.6.17.8/drivers/media/dvb/dvb-core/dvb_net.c 2006-08-07 12:18:54.000000000 +0800
    +++ linux-2.6.17.8-fix/drivers/media/dvb/dvb-core/dvb_net.c 2006-08-21 11:09:12.000000000 +0800
    @@ -492,7 +492,7 @@ static void dvb_net_ule( struct net_devi
    } else
    priv->ule_dbit = 0;

    - if (priv->ule_sndu_len > 32763) {
    + if (priv->ule_sndu_len > 32763 || priv->ule_sndu_len < ((priv->ule_dbit) ? 4 : 4 + ETH_ALEN)) {
    printk(KERN_WARNING "%lu: Invalid ULE SNDU length %u. "
    "Resyncing.\n", priv->ts_count, priv->ule_sndu_len);
    priv->ule_sndu_len = 0;


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