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BUG: KMSAN: uninit-value in xdp_do_check_flushed+0x41a/0x560 net/core/filter.c:4307
 xdp_do_check_flushed+0x41a/0x560 net/core/filter.c:4307
 __napi_poll+0x10d/0x980 net/core/dev.c:6774
 napi_poll net/core/dev.c:6840 [inline]
 net_rx_action+0xa5a/0x19b0 net/core/dev.c:6962
 handle_softirqs+0x1ce/0x800 kernel/softirq.c:554
 __do_softirq+0x14/0x1a kernel/softirq.c:588
 do_softirq+0x9a/0x100 kernel/softirq.c:455
 __local_bh_enable_ip+0x9f/0xb0 kernel/softirq.c:382
 local_bh_enable include/linux/bottom_half.h:33 [inline]
 tun_get_user+0x4d7a/0x6b50 drivers/net/tun.c:1936
 tun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2052
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0xb2f/0x1550 fs/read_write.c:590
 ksys_write+0x20f/0x4c0 fs/read_write.c:643
 __do_sys_write fs/read_write.c:655 [inline]
 __se_sys_write fs/read_write.c:652 [inline]
 __ia32_sys_write+0x91/0xe0 fs/read_write.c:652
 ia32_sys_call+0x2e34/0x40d0 arch/x86/include/generated/asm/syscalls_32.h:5
 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
 __do_fast_syscall_32+0xb0/0x110 arch/x86/entry/common.c:386
 do_fast_syscall_32+0x38/0x80 arch/x86/entry/common.c:411
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:449
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e

Local variable __bpf_net_ctx created at:
 do_xdp_generic+0x47/0x1560 net/core/dev.c:5129
 tun_get_user+0x4cd1/0x6b50 drivers/net/tun.c:1928

CPU: 0 UID: 0 PID: 6798 Comm: syz.3.513 Not tainted 6.10.0-syzkaller-12381-gc33ffdb70cc6 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
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