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BUG: KMSAN: uninit-value in virtio_net_hdr_to_skb+0x1414/0x14f0 include/linux/virtio_net.h:86
CPU: 1 PID: 12085 Comm: syz-executor.3 Not tainted 5.12.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x24c/0x2e0 lib/dump_stack.c:120
 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:121
 __msan_warning+0x5c/0xa0 mm/kmsan/kmsan_instr.c:197
 virtio_net_hdr_to_skb+0x1414/0x14f0 include/linux/virtio_net.h:86
 packet_snd net/packet/af_packet.c:2994 [inline]
 packet_sendmsg+0x85b8/0x99d0 net/packet/af_packet.c:3031
 sock_sendmsg_nosec net/socket.c:654 [inline]
 sock_sendmsg net/socket.c:674 [inline]
 sock_write_iter+0x585/0x680 net/socket.c:1001
 call_write_iter include/linux/fs.h:1977 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1083/0x1b00 fs/read_write.c:605
 ksys_write+0x275/0x500 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __ia32_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_32_irqs_on arch/x86/entry/common.c:79 [inline]
 __do_fast_syscall_32+0x127/0x180 arch/x86/entry/common.c:142
 do_fast_syscall_32+0x77/0xd0 arch/x86/entry/common.c:168
 do_SYSENTER_32+0x73/0x90 arch/x86/entry/common.c:211
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
RIP: 0023:0xf7fd9549
Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f55d35fc EFLAGS: 00000296 ORIG_RAX: 0000000000000004
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020000100
RDX: 000000000000fdef RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

Uninit was created at:
 kmsan_save_stack_with_flags+0x3c/0x90 mm/kmsan/kmsan.c:121
 kmsan_alloc_page+0xd0/0x1e0 mm/kmsan/kmsan_shadow.c:274
 __alloc_pages_nodemask+0x827/0xf90 mm/page_alloc.c:5044
 __alloc_pages include/linux/gfp.h:525 [inline]
 alloc_page_interleave mm/mempolicy.c:2143 [inline]
 alloc_pages_current+0x5c9/0xb60 mm/mempolicy.c:2275
 alloc_pages include/linux/gfp.h:561 [inline]
 stack_depot_save+0x402/0x4c0 lib/stackdepot.c:325
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:127 [inline]
 kmsan_internal_chain_origin+0xc6/0x130 mm/kmsan/kmsan.c:289
 kmsan_memcpy_memmove_metadata+0x25e/0x2d0 mm/kmsan/kmsan.c:226
 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:246
 __msan_memcpy+0x46/0x60 mm/kmsan/kmsan_instr.c:110
 __nla_put lib/nlattr.c:994 [inline]
 nla_put+0x2eb/0x3c0 lib/nlattr.c:1052
 nla_put_string include/net/netlink.h:1477 [inline]
 nfc_genl_setup_device_added+0x13d/0x650 net/nfc/netlink.c:291
 nfc_genl_device_added+0x154/0x490 net/nfc/netlink.c:314
 nfc_register_device+0x188/0x4d0 net/nfc/core.c:1128
 nfc_digital_register_device+0x55/0x70 net/nfc/digital_core.c:822
 nfcsim_device_new+0x3c0/0xba0 drivers/nfc/nfcsim.c:408
 nfcsim_init+0x1b7/0x586 drivers/nfc/nfcsim.c:455
 do_one_initcall+0x362/0x8d0 init/main.c:1229
 do_initcall_level+0x1e7/0x35a init/main.c:1302
 do_initcalls+0x127/0x1cb init/main.c:1318
 do_basic_setup+0x33/0x36 init/main.c:1338
 kernel_init_freeable+0x287/0x3cc init/main.c:1540
 kernel_init+0x1f/0x840 init/main.c:1427
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
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