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Date:   Wed, 13 Jun 2018 20:13:22 +0200
From:   Daniel Borkmann <>
To:     syzbot <>,,,,,
Subject: Re: KASAN: slab-out-of-bounds Read in bpf_skb_vlan_push

On 06/13/2018 06:17 PM, syzbot wrote:
> Hello,
> syzbot found the following crash on:
> HEAD commit:    75d4e704fa8d netdev-FAQ: clarify DaveM's position for stab..
> git tree:       bpf-next
> console output:
> kernel config:
> dashboard link:
> compiler:       gcc (GCC) 8.0.1 20180413 (experimental)
> syzkaller repro:
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by:
> IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
> IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
> 8021q: adding VLAN 0 to HW filter on device team0
> 8021q: adding VLAN 0 to HW filter on device team0
> ==================================================================
> BUG: KASAN: slab-out-of-bounds in skb_at_tc_ingress include/net/sch_generic.h:535 [inline]
> BUG: KASAN: slab-out-of-bounds in bpf_push_mac_rcsum net/core/filter.c:1625 [inline]
> BUG: KASAN: slab-out-of-bounds in ____bpf_skb_vlan_push net/core/filter.c:2446 [inline]
> BUG: KASAN: slab-out-of-bounds in bpf_skb_vlan_push+0x6b7/0x720 net/core/filter.c:2437
> Read of size 5 at addr ffff8801b77347d0 by task syz-executor6/6529

Should be fixed already by:

#syz test: git://

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