diff mbox series

[maint] batman-adv: Avoid uninitialized chaddr when handling DHCP

Message ID 20200722184923.6577-1-sven@narfation.org
State Accepted, archived
Delegated to: Simon Wunderlich
Headers show
Series [maint] batman-adv: Avoid uninitialized chaddr when handling DHCP | expand

Commit Message

Sven Eckelmann July 22, 2020, 6:49 p.m. UTC
The gateway client code can try to optimize the delivery of DHCP packets to
avoid broadcasting them through the whole mesh. But also transmissions to
the client can be optimized by looking up the destination via the chaddr of
the DHCP packet.

But the chaddr is currently only done when chaddr is fully inside the
non-paged area of the skbuff. Otherwise it will not be initialized and the
unoptimized path should have been taken.

But the implementation didn't handle this correctly. It didn't retrieve the
correct chaddr but still tried to perform the TT lookup with this
uninitialized memory.

Reported-by: syzbot+ab16e463b903f5a37036@syzkaller.appspotmail.com
Fixes: 2d5b555644b2 ("batman-adv: send every DHCP packet as bat-unicast")
Signed-off-by: Sven Eckelmann <sven@narfation.org>
---
 net/batman-adv/gateway_client.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

Comments

Antonio Quartulli July 22, 2020, 7:26 p.m. UTC | #1
On 22/07/2020 20:49, Sven Eckelmann wrote:
> The gateway client code can try to optimize the delivery of DHCP packets to
> avoid broadcasting them through the whole mesh. But also transmissions to
> the client can be optimized by looking up the destination via the chaddr of
> the DHCP packet.
> 
> But the chaddr is currently only done when chaddr is fully inside the
> non-paged area of the skbuff. Otherwise it will not be initialized and the
> unoptimized path should have been taken.
> 
> But the implementation didn't handle this correctly. It didn't retrieve the
> correct chaddr but still tried to perform the TT lookup with this
> uninitialized memory.
> 
> Reported-by: syzbot+ab16e463b903f5a37036@syzkaller.appspotmail.com
> Fixes: 2d5b555644b2 ("batman-adv: send every DHCP packet as bat-unicast")
> Signed-off-by: Sven Eckelmann <sven@narfation.org>

Acked-by: Antonio Quartulli <a@unstable.cc>
diff mbox series

Patch

diff --git a/net/batman-adv/gateway_client.c b/net/batman-adv/gateway_client.c
index a18dcc68..ef3f85b5 100644
--- a/net/batman-adv/gateway_client.c
+++ b/net/batman-adv/gateway_client.c
@@ -703,8 +703,10 @@  batadv_gw_dhcp_recipient_get(struct sk_buff *skb, unsigned int *header_len,
 
 	chaddr_offset = *header_len + BATADV_DHCP_CHADDR_OFFSET;
 	/* store the client address if the message is going to a client */
-	if (ret == BATADV_DHCP_TO_CLIENT &&
-	    pskb_may_pull(skb, chaddr_offset + ETH_ALEN)) {
+	if (ret == BATADV_DHCP_TO_CLIENT) {
+		if (!pskb_may_pull(skb, chaddr_offset + ETH_ALEN))
+			return BATADV_DHCP_NO;
+
 		/* check if the DHCP packet carries an Ethernet DHCP */
 		p = skb->data + *header_len + BATADV_DHCP_HTYPE_OFFSET;
 		if (*p != BATADV_DHCP_HTYPE_ETHERNET)