leandrof/linux
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

batman-adv: fix skb->data assignment

Browse Source 
skb_linearize(skb) possibly rearranges the skb internal data and then changes
the skb->data pointer value. For this reason any other pointer in the code that
was assigned skb->data before invoking skb_linearise(skb) must be re-assigned.

In the current tt_query message handling code this is not done and therefore, in
case of skb linearization, the pointer used to handle the packet header ends up
in pointing to poisoned memory. The packet is then dropped but the
translation-table mechanism is corrupted.

Signed-off-by: Antonio Quartulli <ordex@autistici.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Sven Eckelmann <sven@narfation.org>
This commit is contained in:
Antonio Quartulli 2012-06-14 22:21:28 +02:00
parent 284fefd59a
commit d2b6cc8e46
1 changed files with 2 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
net/batman-adv/routing.c
View File

@ -617,6 +617,8 @@ int recv_tt_query(struct sk_buff *skb, struct hard_iface *recv_if)
* changes */
if (skb_linearize(skb) < 0)
goto out;
/* skb_linearize() possibly changed skb->data */
tt_query = (struct tt_query_packet *)skb->data;
tt_len = tt_query->tt_data * sizeof(struct tt_change);