Re: Re: KASAN: slab-out-of-bounds Read in bpf_skb_vlan_push

[syzbot]

> On 06/13/2018 06:17 PM, syzbot wrote:
> > Hello,

> > syzbot found the following crash on:

> > HEAD commit:ÂÂÂ 75d4e704fa8d netdev-FAQ: clarify DaveM's position for  
> > stab..
> > git tree:ÂÂÂÂÂÂ bpf-next
> > console output: https://syzkaller.appspot.com/x/log.txt?x=1754783f800000
> > kernel config:Â  
> > https://syzkaller.appspot.com/x/.config?x=a601a80fec461d44
> > dashboard link:  
> > https://syzkaller.appspot.com/bug?extid=76de61614cb1abdd73fc
> > compiler:ÂÂÂÂÂÂ gcc (GCC) 8.0.1 20180413 (experimental)
> > syzkaller  
> > repro:https://syzkaller.appspot.com/x/repro.syz?x=12c1e1bf800000

> > IMPORTANT: if you fix the bug, please add the following tag to the  
> > commit:
> > Reported-by: syzbot+76de61614cb1abdd73fc@xxxxxxxxxxxxxxxxxxxxxxxxx

> > 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:

>     
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=58990d1ff3f7896ee341030e9a7c2e4002570683


> #syz test:  
> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git

want 2 args (repo, branch), got 1