tree dfedd7338bb67042614d3e676f498405c1a52f98
parent 0fa963553a5c28d8f8aabd8878326d3f782045fc
author Michael Holzheu <holzheu@linux.vnet.ibm.com> 1462993993 +0200
committer Martin Schwidefsky <schwidefsky@de.ibm.com> 1463642067 +0200

s390/bpf: fix recache skb->data/hlen for skb_vlan_push/pop

In case of usage of skb_vlan_push/pop, in the prologue we store
the SKB pointer on the stack and restore it after BPF_JMP_CALL
to skb_vlan_push/pop.

Unfortunately currently there are two bugs in the code:

 1) The wrong stack slot (offset 170 instead of 176) is used
 2) The wrong register (W1 instead of B1) is saved

So fix this and use correct stack slot and register.

Fixes: 9db7f2b81880 ("s390/bpf: recache skb->data/hlen for skb_vlan_push/pop")
Cc: stable@vger.kernel.org # 4.3+
Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>