mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-11 04:18:39 +08:00
net: sched: ife: check on metadata length
This patch checks if sk buffer is available to dererence ife header. If not then NULL will returned to signal an malformed ife packet. This avoids to crashing the kernel from outside. Signed-off-by: Alexander Aring <aring@mojatatu.com> Reviewed-by: Yotam Gigi <yotam.gi@gmail.com> Acked-by: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
parent
cc74eddd0f
commit
d57493d6d1
@ -69,6 +69,9 @@ void *ife_decode(struct sk_buff *skb, u16 *metalen)
|
||||
int total_pull;
|
||||
u16 ifehdrln;
|
||||
|
||||
if (!pskb_may_pull(skb, skb->dev->hard_header_len + IFE_METAHDRLEN))
|
||||
return NULL;
|
||||
|
||||
ifehdr = (struct ifeheadr *) (skb->data + skb->dev->hard_header_len);
|
||||
ifehdrln = ntohs(ifehdr->metalen);
|
||||
total_pull = skb->dev->hard_header_len + ifehdrln;
|
||||
|
Loading…
Reference in New Issue
Block a user