From: Eric Dumazet <eduma...@google.com> Date: Mon, 26 Mar 2018 08:08:07 -0700
> skb mac header is not necessarily set at the time skb_network_protocol() > is called. Use skb->data instead. > > BUG: KASAN: slab-out-of-bounds in skb_network_protocol+0x46b/0x4b0 > net/core/dev.c:2739 > Read of size 2 at addr ffff8801b3097a0b by task syz-executor5/14242 > > CPU: 1 PID: 14242 Comm: syz-executor5 Not tainted 4.16.0-rc6+ #280 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > Call Trace: > __dump_stack lib/dump_stack.c:17 [inline] > dump_stack+0x194/0x24d lib/dump_stack.c:53 > print_address_description+0x73/0x250 mm/kasan/report.c:256 > kasan_report_error mm/kasan/report.c:354 [inline] > kasan_report+0x23c/0x360 mm/kasan/report.c:412 > __asan_report_load_n_noabort+0xf/0x20 mm/kasan/report.c:443 > skb_network_protocol+0x46b/0x4b0 net/core/dev.c:2739 > harmonize_features net/core/dev.c:2924 [inline] > netif_skb_features+0x509/0x9b0 net/core/dev.c:3011 > validate_xmit_skb+0x81/0xb00 net/core/dev.c:3084 > validate_xmit_skb_list+0xbf/0x120 net/core/dev.c:3142 > packet_direct_xmit+0x117/0x790 net/packet/af_packet.c:256 > packet_snd net/packet/af_packet.c:2944 [inline] > packet_sendmsg+0x3aed/0x60b0 net/packet/af_packet.c:2969 > sock_sendmsg_nosec net/socket.c:629 [inline] > sock_sendmsg+0xca/0x110 net/socket.c:639 > ___sys_sendmsg+0x767/0x8b0 net/socket.c:2047 > __sys_sendmsg+0xe5/0x210 net/socket.c:2081 > > Fixes: 19acc327258a ("gso: Handle Trans-Ether-Bridging protocol in > skb_network_protocol()") > Signed-off-by: Eric Dumazet <eduma...@google.com> > Cc: Pravin B Shelar <pshe...@ovn.org> > Reported-by: Reported-by: syzbot <syzkal...@googlegroups.com> Applied and queued up for -stable, thanks Eric.