diff options
| author | Ang Way Chuang <wcang@nrg.cs.usm.my> | 2006-10-13 18:01:44 +0200 |
|---|---|---|
| committer | Adrian Bunk <bunk@stusta.de> | 2006-10-13 18:01:44 +0200 |
| commit | 1d82cce6f3d3119c33aed88ed8c94f93341f995a (patch) | |
| tree | dac375939d4320d0880ab29e34b1b3338954dc39 | |
| parent | cc3c0a32e3ed8d40a8d14522bfb3efe62c11c0af (diff) | |
dvb-core: Proper handling ULE SNDU length of 0 (CVE-2006-4623)
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 has been tested on version 2.6.17.11. This bug is 100%
reproducible and the modified source code (GPL) used to produce this bug
will be posted on http://nrg.cs.usm.my/downloads.htm shortly. The
kernel will produce a dump during CRC32 checking on faulty ULE packet.
Signed-off-by: Ang Way Chuang <wcang@nrg.cs.usm.my>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
| -rw-r--r-- | drivers/media/dvb/dvb-core/dvb_net.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/media/dvb/dvb-core/dvb_net.c b/drivers/media/dvb/dvb-core/dvb_net.c index 6711eb6a058c..bdc491452dad 100644 --- a/drivers/media/dvb/dvb-core/dvb_net.c +++ b/drivers/media/dvb/dvb-core/dvb_net.c @@ -492,7 +492,8 @@ static void dvb_net_ule( struct net_device *dev, const u8 *buf, size_t buf_len ) } 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; |