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BUG: KMSAN: kernel-network-infoleak-after-free in __netdev_start_xmit include/linux/netdevice.h:4841 [inline]
BUG: KMSAN: kernel-network-infoleak-after-free in netdev_start_xmit include/linux/netdevice.h:4857 [inline]
BUG: KMSAN: kernel-network-infoleak-after-free in xmit_one+0x100/0x5f0 net/core/dev.c:3590
 __netdev_start_xmit include/linux/netdevice.h:4841 [inline]
 netdev_start_xmit include/linux/netdevice.h:4857 [inline]
 xmit_one+0x100/0x5f0 net/core/dev.c:3590
 dev_hard_start_xmit+0xe5/0x370 net/core/dev.c:3606
 __dev_queue_xmit+0x1dec/0x31f0 net/core/dev.c:4256
 dev_queue_xmit include/linux/netdevice.h:3009 [inline]
 __netlink_deliver_tap_skb net/netlink/af_netlink.c:307 [inline]
 __netlink_deliver_tap+0x7f6/0xca0 net/netlink/af_netlink.c:325
 netlink_deliver_tap net/netlink/af_netlink.c:338 [inline]
 netlink_deliver_tap_kernel net/netlink/af_netlink.c:347 [inline]
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x10fb/0x1270 net/netlink/af_netlink.c:1345
 netlink_sendmsg+0x127d/0x1430 net/netlink/af_netlink.c:1921
 sock_sendmsg_nosec net/socket.c:714 [inline]
 sock_sendmsg net/socket.c:734 [inline]
 ____sys_sendmsg+0xa8e/0xe70 net/socket.c:2482
 ___sys_sendmsg+0x2a1/0x3f0 net/socket.c:2536
 __sys_sendmsg net/socket.c:2565 [inline]
 __do_sys_sendmsg net/socket.c:2574 [inline]
 __se_sys_sendmsg net/socket.c:2572 [inline]
 __x64_sys_sendmsg+0x367/0x540 net/socket.c:2572
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Uninit was stored to memory at:
 skb_put_data include/linux/skbuff.h:2579 [inline]
 netlink_to_full_skb net/netlink/af_netlink.c:181 [inline]
 __netlink_deliver_tap_skb net/netlink/af_netlink.c:298 [inline]
 __netlink_deliver_tap+0x575/0xca0 net/netlink/af_netlink.c:325
 netlink_deliver_tap net/netlink/af_netlink.c:338 [inline]
 netlink_deliver_tap_kernel net/netlink/af_netlink.c:347 [inline]
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x10fb/0x1270 net/netlink/af_netlink.c:1345
 netlink_sendmsg+0x127d/0x1430 net/netlink/af_netlink.c:1921
 sock_sendmsg_nosec net/socket.c:714 [inline]
 sock_sendmsg net/socket.c:734 [inline]
 ____sys_sendmsg+0xa8e/0xe70 net/socket.c:2482
 ___sys_sendmsg+0x2a1/0x3f0 net/socket.c:2536
 __sys_sendmsg net/socket.c:2565 [inline]
 __do_sys_sendmsg net/socket.c:2574 [inline]
 __se_sys_sendmsg net/socket.c:2572 [inline]
 __x64_sys_sendmsg+0x367/0x540 net/socket.c:2572
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Uninit was created at:
 free_pages_prepare mm/page_alloc.c:1410 [inline]
 free_pcp_prepare+0x40/0x640 mm/page_alloc.c:1532
 free_unref_page_prepare mm/page_alloc.c:3387 [inline]
 free_unref_page+0x41/0x940 mm/page_alloc.c:3483
 free_the_page mm/page_alloc.c:770 [inline]
 __free_pages+0x78/0x1c0 mm/page_alloc.c:5644
 free_pages+0x96/0xb0 mm/page_alloc.c:5655
 _pgd_free arch/x86/mm/pgtable.c:420 [inline]
 pgd_free+0x1f6/0x2a0 arch/x86/mm/pgtable.c:476
 mm_free_pgd kernel/fork.c:734 [inline]
 __mmdrop+0xd4/0x7c0 kernel/fork.c:785
 mmdrop include/linux/sched/mm.h:50 [inline]
 __mmput+0x4a7/0x510 kernel/fork.c:1196
 mmput+0x76/0x80 kernel/fork.c:1207
 exit_mm+0x1b8/0x360 kernel/exit.c:516
 do_exit+0xe28/0x3f70 kernel/exit.c:807
 do_group_exit+0x2f9/0x390 kernel/exit.c:950
 get_signal+0x19e8/0x2050 kernel/signal.c:2858
 arch_do_signal_or_restart+0x56/0xae0 arch/x86/kernel/signal.c:869
 exit_to_user_mode_loop+0xea/0x320 kernel/entry/common.c:168
 exit_to_user_mode_prepare+0x16e/0x220 kernel/entry/common.c:203
 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
 syscall_exit_to_user_mode+0x23/0x40 kernel/entry/common.c:296
 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Bytes 3780-3839 of 3840 are uninitialized
Memory access of size 3840 starts at ffff8880984e2000

CPU: 1 PID: 3616 Comm: syz-executor.2 Not tainted 6.1.0-syzkaller-64311-g5c6259d6d19f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
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