===================================================== BUG: KMSAN: uninit-value in ____bpf_skb_load_helper_8 net/core/filter.c:184 [inline] BUG: KMSAN: uninit-value in bpf_skb_load_helper_8+0xe0/0x290 net/core/filter.c:178 CPU: 1 PID: 29829 Comm: syz-executor.3 Not tainted 5.7.0-rc4-syzkaller #0 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+0x1c9/0x220 lib/dump_stack.c:118 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:121 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215 ____bpf_skb_load_helper_8 net/core/filter.c:184 [inline] bpf_skb_load_helper_8+0xe0/0x290 net/core/filter.c:178 ___bpf_prog_run+0x214d/0x97a0 kernel/bpf/core.c:1516 __bpf_prog_run32+0x101/0x170 kernel/bpf/core.c:1681 bpf_dispatcher_nop_func include/linux/bpf.h:545 [inline] bpf_prog_run_pin_on_cpu include/linux/filter.h:599 [inline] bpf_prog_run_clear_cb include/linux/filter.h:721 [inline] fanout_demux_bpf net/packet/af_packet.c:1404 [inline] packet_rcv_fanout+0x51e/0x25c0 net/packet/af_packet.c:1456 dev_queue_xmit_nit+0x1199/0x1270 net/core/dev.c:2276 xmit_one net/core/dev.c:3473 [inline] dev_hard_start_xmit+0x20f/0xab0 net/core/dev.c:3493 __dev_queue_xmit+0x2f8d/0x3b20 net/core/dev.c:4052 dev_queue_xmit+0x4b/0x60 net/core/dev.c:4085 __netlink_deliver_tap_skb net/netlink/af_netlink.c:294 [inline] __netlink_deliver_tap net/netlink/af_netlink.c:312 [inline] netlink_deliver_tap+0x9d4/0xea0 net/netlink/af_netlink.c:325 __netlink_sendskb net/netlink/af_netlink.c:1247 [inline] netlink_sendskb net/netlink/af_netlink.c:1256 [inline] netlink_unicast+0xa34/0x1100 net/netlink/af_netlink.c:1344 netlink_ack+0x105c/0x11a0 net/netlink/af_netlink.c:2439 netlink_rcv_skb+0x321/0x650 net/netlink/af_netlink.c:2475 genl_rcv+0x63/0x80 net/netlink/genetlink.c:746 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0xf9e/0x1100 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x1246/0x14d0 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg net/socket.c:672 [inline] ____sys_sendmsg+0x12b6/0x1350 net/socket.c:2362 ___sys_sendmsg net/socket.c:2416 [inline] __sys_sendmsg+0x623/0x750 net/socket.c:2449 __compat_sys_sendmsg net/compat.c:658 [inline] __do_compat_sys_socketcall net/compat.c:812 [inline] __se_compat_sys_socketcall+0xff2/0x1460 net/compat.c:735 __ia32_compat_sys_socketcall+0x3e/0x60 net/compat.c:735 do_syscall_32_irqs_on arch/x86/entry/common.c:339 [inline] do_fast_syscall_32+0x3bf/0x6d0 arch/x86/entry/common.c:398 entry_SYSENTER_compat+0x68/0x77 arch/x86/entry/entry_64_compat.S:139 RIP: 0023:0xf7fe7dd9 Code: 90 e8 0b 00 00 00 f3 90 0f ae e8 eb f9 8d 74 26 00 89 3c 24 c3 90 90 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:00000000f5dc0e40 EFLAGS: 00000286 ORIG_RAX: 0000000000000066 RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 00000000f5dc0e54 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000014 RBP: 00000000f5dc1168 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline] kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:310 __msan_chain_origin+0x50/0x90 mm/kmsan/kmsan_instr.c:165 ___bpf_prog_run+0x6cbe/0x97a0 kernel/bpf/core.c:1391 __bpf_prog_run32+0x101/0x170 kernel/bpf/core.c:1681 bpf_dispatcher_nop_func include/linux/bpf.h:545 [inline] bpf_prog_run_pin_on_cpu include/linux/filter.h:599 [inline] bpf_prog_run_clear_cb include/linux/filter.h:721 [inline] fanout_demux_bpf net/packet/af_packet.c:1404 [inline] packet_rcv_fanout+0x51e/0x25c0 net/packet/af_packet.c:1456 dev_queue_xmit_nit+0x1199/0x1270 net/core/dev.c:2276 xmit_one net/core/dev.c:3473 [inline] dev_hard_start_xmit+0x20f/0xab0 net/core/dev.c:3493 __dev_queue_xmit+0x2f8d/0x3b20 net/core/dev.c:4052 dev_queue_xmit+0x4b/0x60 net/core/dev.c:4085 __netlink_deliver_tap_skb net/netlink/af_netlink.c:294 [inline] __netlink_deliver_tap net/netlink/af_netlink.c:312 [inline] netlink_deliver_tap+0x9d4/0xea0 net/netlink/af_netlink.c:325 __netlink_sendskb net/netlink/af_netlink.c:1247 [inline] netlink_sendskb net/netlink/af_netlink.c:1256 [inline] netlink_unicast+0xa34/0x1100 net/netlink/af_netlink.c:1344 netlink_ack+0x105c/0x11a0 net/netlink/af_netlink.c:2439 netlink_rcv_skb+0x321/0x650 net/netlink/af_netlink.c:2475 genl_rcv+0x63/0x80 net/netlink/genetlink.c:746 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0xf9e/0x1100 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x1246/0x14d0 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg net/socket.c:672 [inline] ____sys_sendmsg+0x12b6/0x1350 net/socket.c:2362 ___sys_sendmsg net/socket.c:2416 [inline] __sys_sendmsg+0x623/0x750 net/socket.c:2449 __compat_sys_sendmsg net/compat.c:658 [inline] __do_compat_sys_socketcall net/compat.c:812 [inline] __se_compat_sys_socketcall+0xff2/0x1460 net/compat.c:735 __ia32_compat_sys_socketcall+0x3e/0x60 net/compat.c:735 do_syscall_32_irqs_on arch/x86/entry/common.c:339 [inline] do_fast_syscall_32+0x3bf/0x6d0 arch/x86/entry/common.c:398 entry_SYSENTER_compat+0x68/0x77 arch/x86/entry/entry_64_compat.S:139 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline] kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:310 __msan_chain_origin+0x50/0x90 mm/kmsan/kmsan_instr.c:165 ___bpf_prog_run+0x6c64/0x97a0 kernel/bpf/core.c:1391 __bpf_prog_run32+0x101/0x170 kernel/bpf/core.c:1681 bpf_dispatcher_nop_func include/linux/bpf.h:545 [inline] bpf_prog_run_pin_on_cpu include/linux/filter.h:599 [inline] bpf_prog_run_clear_cb include/linux/filter.h:721 [inline] fanout_demux_bpf net/packet/af_packet.c:1404 [inline] packet_rcv_fanout+0x51e/0x25c0 net/packet/af_packet.c:1456 dev_queue_xmit_nit+0x1199/0x1270 net/core/dev.c:2276 xmit_one net/core/dev.c:3473 [inline] dev_hard_start_xmit+0x20f/0xab0 net/core/dev.c:3493 __dev_queue_xmit+0x2f8d/0x3b20 net/core/dev.c:4052 dev_queue_xmit+0x4b/0x60 net/core/dev.c:4085 __netlink_deliver_tap_skb net/netlink/af_netlink.c:294 [inline] __netlink_deliver_tap net/netlink/af_netlink.c:312 [inline] netlink_deliver_tap+0x9d4/0xea0 net/netlink/af_netlink.c:325 __netlink_sendskb net/netlink/af_netlink.c:1247 [inline] netlink_sendskb net/netlink/af_netlink.c:1256 [inline] netlink_unicast+0xa34/0x1100 net/netlink/af_netlink.c:1344 netlink_ack+0x105c/0x11a0 net/netlink/af_netlink.c:2439 netlink_rcv_skb+0x321/0x650 net/netlink/af_netlink.c:2475 genl_rcv+0x63/0x80 net/netlink/genetlink.c:746 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0xf9e/0x1100 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x1246/0x14d0 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg net/socket.c:672 [inline] ____sys_sendmsg+0x12b6/0x1350 net/socket.c:2362 ___sys_sendmsg net/socket.c:2416 [inline] __sys_sendmsg+0x623/0x750 net/socket.c:2449 __compat_sys_sendmsg net/compat.c:658 [inline] __do_compat_sys_socketcall net/compat.c:812 [inline] __se_compat_sys_socketcall+0xff2/0x1460 net/compat.c:735 __ia32_compat_sys_socketcall+0x3e/0x60 net/compat.c:735 do_syscall_32_irqs_on arch/x86/entry/common.c:339 [inline] do_fast_syscall_32+0x3bf/0x6d0 arch/x86/entry/common.c:398 entry_SYSENTER_compat+0x68/0x77 arch/x86/entry/entry_64_compat.S:139 Local variable ----regs@__bpf_prog_run32 created at: __bpf_prog_run32+0x87/0x170 kernel/bpf/core.c:1681 __bpf_prog_run32+0x87/0x170 kernel/bpf/core.c:1681 =====================================================