=====================================================
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_sendto+0x7f2/0xa60 net/socket.c:2117
 __do_sys_sendto net/socket.c:2129 [inline]
 __se_sys_sendto net/socket.c:2125 [inline]
 __x64_sys_sendto+0x121/0x1c0 net/socket.c:2125
 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_sendto+0x7f2/0xa60 net/socket.c:2117
 __do_sys_sendto net/socket.c:2129 [inline]
 __se_sys_sendto net/socket.c:2125 [inline]
 __x64_sys_sendto+0x121/0x1c0 net/socket.c:2125
 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
 __folio_put_small mm/swap.c:105 [inline]
 __folio_put+0x109/0x160 mm/swap.c:128
 folio_put include/linux/mm.h:1159 [inline]
 put_page include/linux/mm.h:1211 [inline]
 anon_pipe_buf_release+0x276/0x7f0 fs/pipe.c:138
 pipe_buf_release include/linux/pipe_fs_i.h:183 [inline]
 pipe_read+0xcbc/0x21e0 fs/pipe.c:324
 call_read_iter include/linux/fs.h:2193 [inline]
 new_sync_read fs/read_write.c:389 [inline]
 vfs_read+0x8c9/0xf40 fs/read_write.c:470
 ksys_read+0x21b/0x4e0 fs/read_write.c:613
 __do_sys_read fs/read_write.c:623 [inline]
 __se_sys_read fs/read_write.c:621 [inline]
 __x64_sys_read+0x8f/0xd0 fs/read_write.c:621
 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

Bytes 68212-68223 of 68224 are uninitialized
Memory access of size 68224 starts at ffff888131460000

CPU: 1 PID: 3526 Comm: syz-executor309 Not tainted 6.1.0-rc7-syzkaller-63931-g49a9a20768f5 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
=====================================================