================================================================== BUG: KMSAN: uninit-value in br_validate_ipv4+0x59a/0x9c0 net/bridge/br_netfilter_hooks.c:217 CPU: 0 PID: 25636 Comm: syz-executor4 Not tainted 4.19.0-rc8+ #70 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x306/0x460 lib/dump_stack.c:113 kmsan_report+0x1a2/0x2e0 mm/kmsan/kmsan.c:917 __msan_warning+0x7c/0xe0 mm/kmsan/kmsan_instr.c:500 br_validate_ipv4+0x59a/0x9c0 net/bridge/br_netfilter_hooks.c:217 br_nf_pre_routing+0xfca/0x1a80 net/bridge/br_netfilter_hooks.c:505 nf_hook_entry_hookfn include/linux/netfilter.h:119 [inline] nf_hook_slow+0x15c/0x3d0 net/netfilter/core.c:511 nf_hook include/linux/netfilter.h:244 [inline] NF_HOOK include/linux/netfilter.h:287 [inline] br_handle_frame+0xce6/0x1f30 net/bridge/br_input.c:303 __netif_receive_skb_core+0x20e8/0x5380 net/core/dev.c:4842 __netif_receive_skb_one_core net/core/dev.c:4911 [inline] __netif_receive_skb net/core/dev.c:5023 [inline] process_backlog+0x74a/0x11d0 net/core/dev.c:5829 napi_poll net/core/dev.c:6249 [inline] net_rx_action+0x975/0x1cf0 net/core/dev.c:6315 __do_softirq+0x601/0xa6d kernel/softirq.c:292 do_softirq_own_stack+0x49/0x80 arch/x86/entry/entry_64.S:1055 do_softirq kernel/softirq.c:336 [inline] __local_bh_enable_ip+0x139/0x170 kernel/softirq.c:189 local_bh_enable+0x36/0x40 include/linux/bottom_half.h:32 rcu_read_unlock_bh include/linux/rcupdate.h:723 [inline] __dev_queue_xmit+0x380c/0x3d90 net/core/dev.c:3851 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3857 packet_snd net/packet/af_packet.c:2928 [inline] packet_sendmsg+0x853e/0x9170 net/packet/af_packet.c:2953 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg net/socket.c:631 [inline] ___sys_sendmsg+0xe47/0x1200 net/socket.c:2116 __sys_sendmsg net/socket.c:2154 [inline] __do_sys_sendmsg net/socket.c:2163 [inline] __se_sys_sendmsg+0x307/0x460 net/socket.c:2161 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2161 do_syscall_64+0xbe/0x100 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 RIP: 0033:0x457569 Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f02ebe6fc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457569 RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000003 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f02ebe706d4 R13: 00000000004c3823 R14: 00000000004d5640 R15: 00000000ffffffff Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:255 [inline] kmsan_save_stack mm/kmsan/kmsan.c:270 [inline] kmsan_internal_chain_origin+0x136/0x240 mm/kmsan/kmsan.c:572 kmsan_memcpy_origins+0x13d/0x1b0 mm/kmsan/kmsan.c:396 __msan_memcpy+0xcf/0x150 mm/kmsan/kmsan_instr.c:286 pskb_expand_head+0x441/0x1d00 net/core/skbuff.c:1470 __skb_cow include/linux/skbuff.h:2911 [inline] skb_cow_head include/linux/skbuff.h:2945 [inline] ip_tunnel_xmit+0x3611/0x3d70 net/ipv4/ip_tunnel.c:780 __gre_xmit net/ipv4/ip_gre.c:454 [inline] ipgre_xmit+0xf59/0x1070 net/ipv4/ip_gre.c:708 __netdev_start_xmit include/linux/netdevice.h:4297 [inline] netdev_start_xmit include/linux/netdevice.h:4306 [inline] xmit_one net/core/dev.c:3238 [inline] dev_hard_start_xmit+0x6b8/0xdb0 net/core/dev.c:3254 __dev_queue_xmit+0x2e62/0x3d90 net/core/dev.c:3824 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3857 packet_snd net/packet/af_packet.c:2928 [inline] packet_sendmsg+0x853e/0x9170 net/packet/af_packet.c:2953 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg net/socket.c:631 [inline] ___sys_sendmsg+0xe47/0x1200 net/socket.c:2116 __sys_sendmsg net/socket.c:2154 [inline] __do_sys_sendmsg net/socket.c:2163 [inline] __se_sys_sendmsg+0x307/0x460 net/socket.c:2161 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2161 do_syscall_64+0xbe/0x100 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:255 [inline] kmsan_internal_poison_shadow+0xc8/0x1d0 mm/kmsan/kmsan.c:180 kmsan_kmalloc+0xa4/0x120 mm/kmsan/kmsan_hooks.c:104 kmsan_slab_alloc+0x10/0x20 mm/kmsan/kmsan_hooks.c:113 slab_post_alloc_hook mm/slab.h:446 [inline] slab_alloc_node mm/slub.c:2727 [inline] __kmalloc_node_track_caller+0xb43/0x1400 mm/slub.c:4360 __kmalloc_reserve net/core/skbuff.c:138 [inline] __alloc_skb+0x422/0xe90 net/core/skbuff.c:206 alloc_skb include/linux/skbuff.h:996 [inline] alloc_skb_with_frags+0x1d0/0xac0 net/core/skbuff.c:5275 sock_alloc_send_pskb+0xe00/0x1420 net/core/sock.c:2082 packet_alloc_skb net/packet/af_packet.c:2781 [inline] packet_snd net/packet/af_packet.c:2872 [inline] packet_sendmsg+0x6874/0x9170 net/packet/af_packet.c:2953 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg net/socket.c:631 [inline] ___sys_sendmsg+0xe47/0x1200 net/socket.c:2116 __sys_sendmsg net/socket.c:2154 [inline] __do_sys_sendmsg net/socket.c:2163 [inline] __se_sys_sendmsg+0x307/0x460 net/socket.c:2161 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2161 do_syscall_64+0xbe/0x100 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 ==================================================================