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BUG: KMSAN: uninit-value in __netif_receive_skb_core+0x692/0x63b0 net/core/dev.c:5233
 __netif_receive_skb_core+0x692/0x63b0 net/core/dev.c:5233
 __netif_receive_skb_one_core net/core/dev.c:5403 [inline]
 __netif_receive_skb+0xc8/0x5d0 net/core/dev.c:5519
 process_backlog+0x45a/0x890 net/core/dev.c:5847
 __napi_poll+0xe6/0x920 net/core/dev.c:6413
 napi_poll net/core/dev.c:6480 [inline]
 net_rx_action+0x720/0x17e0 net/core/dev.c:6567
 __do_softirq+0x1cc/0x7fb kernel/softirq.c:558
 do_softirq+0x13d/0x1e0 kernel/softirq.c:459
 __local_bh_enable_ip+0x93/0xa0 kernel/softirq.c:383
 local_bh_enable+0x24/0x30 include/linux/bottom_half.h:33
 tun_rx_batched+0x83c/0x930
 tun_get_user+0x3f44/0x4530 drivers/net/tun.c:1985
 tun_chr_write_iter+0x3ab/0x5d0 drivers/net/tun.c:2015
 call_write_iter include/linux/fs.h:2050 [inline]
 new_sync_write fs/read_write.c:504 [inline]
 vfs_write+0xcf0/0x1810 fs/read_write.c:591
 ksys_write+0x21b/0x4e0 fs/read_write.c:644
 __do_sys_write fs/read_write.c:656 [inline]
 __se_sys_write fs/read_write.c:653 [inline]
 __x64_sys_write+0x8f/0xd0 fs/read_write.c:653
 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+0x44/0xae

Uninit was stored to memory at:
 __copy_skb_header+0x753/0x8c0 net/core/skbuff.c:1018
 __skb_clone+0x57/0x650 net/core/skbuff.c:1059
 skb_clone+0x356/0x550 net/core/skbuff.c:1527
 hsr_get_untagged_frame+0x618/0x850 net/hsr/hsr_forward.c:164
 hsr_forward_skb+0x19bb/0x3040 net/hsr/hsr_forward.c:623
 hsr_handle_frame+0x995/0xab0 net/hsr/hsr_slave.c:69
 __netif_receive_skb_core+0x214d/0x63b0 net/core/dev.c:5297
 __netif_receive_skb_one_core net/core/dev.c:5403 [inline]
 __netif_receive_skb+0xc8/0x5d0 net/core/dev.c:5519
 netif_receive_skb_internal+0x174/0x340 net/core/dev.c:5605
 netif_receive_skb+0x35/0x350 net/core/dev.c:5664
 tun_rx_batched+0x837/0x930
 tun_get_user+0x3f44/0x4530 drivers/net/tun.c:1985
 tun_chr_write_iter+0x3ab/0x5d0 drivers/net/tun.c:2015
 call_write_iter include/linux/fs.h:2050 [inline]
 new_sync_write fs/read_write.c:504 [inline]
 vfs_write+0xcf0/0x1810 fs/read_write.c:591
 ksys_write+0x21b/0x4e0 fs/read_write.c:644
 __do_sys_write fs/read_write.c:656 [inline]
 __se_sys_write fs/read_write.c:653 [inline]
 __x64_sys_write+0x8f/0xd0 fs/read_write.c:653
 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+0x44/0xae

Uninit was stored to memory at:
 create_stripped_skb_hsr net/hsr/hsr_forward.c:145 [inline]
 hsr_get_untagged_frame+0x757/0x850 net/hsr/hsr_forward.c:155
 hsr_forward_skb+0x19bb/0x3040 net/hsr/hsr_forward.c:623
 hsr_handle_frame+0x995/0xab0 net/hsr/hsr_slave.c:69
 __netif_receive_skb_core+0x214d/0x63b0 net/core/dev.c:5297
 __netif_receive_skb_one_core net/core/dev.c:5403 [inline]
 __netif_receive_skb+0xc8/0x5d0 net/core/dev.c:5519
 netif_receive_skb_internal+0x174/0x340 net/core/dev.c:5605
 netif_receive_skb+0x35/0x350 net/core/dev.c:5664
 tun_rx_batched+0x837/0x930
 tun_get_user+0x3f44/0x4530 drivers/net/tun.c:1985
 tun_chr_write_iter+0x3ab/0x5d0 drivers/net/tun.c:2015
 call_write_iter include/linux/fs.h:2050 [inline]
 new_sync_write fs/read_write.c:504 [inline]
 vfs_write+0xcf0/0x1810 fs/read_write.c:591
 ksys_write+0x21b/0x4e0 fs/read_write.c:644
 __do_sys_write fs/read_write.c:656 [inline]
 __se_sys_write fs/read_write.c:653 [inline]
 __x64_sys_write+0x8f/0xd0 fs/read_write.c:653
 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+0x44/0xae

Uninit was created at:
 slab_post_alloc_hook mm/slab.h:754 [inline]
 slab_alloc_node mm/slub.c:3232 [inline]
 __kmalloc_node_track_caller+0x86c/0x1230 mm/slub.c:4963
 kmalloc_reserve net/core/skbuff.c:354 [inline]
 __alloc_skb+0x353/0xce0 net/core/skbuff.c:426
 __pskb_copy_fclone+0xd1/0x1780 net/core/skbuff.c:1625
 __pskb_copy include/linux/skbuff.h:1364 [inline]
 create_stripped_skb_hsr net/hsr/hsr_forward.c:128 [inline]
 hsr_get_untagged_frame+0x153/0x850 net/hsr/hsr_forward.c:155
 hsr_forward_skb+0x19bb/0x3040 net/hsr/hsr_forward.c:623
 hsr_handle_frame+0x995/0xab0 net/hsr/hsr_slave.c:69
 __netif_receive_skb_core+0x214d/0x63b0 net/core/dev.c:5297
 __netif_receive_skb_one_core net/core/dev.c:5403 [inline]
 __netif_receive_skb+0xc8/0x5d0 net/core/dev.c:5519
 netif_receive_skb_internal+0x174/0x340 net/core/dev.c:5605
 netif_receive_skb+0x35/0x350 net/core/dev.c:5664
 tun_rx_batched+0x837/0x930
 tun_get_user+0x3f44/0x4530 drivers/net/tun.c:1985
 tun_chr_write_iter+0x3ab/0x5d0 drivers/net/tun.c:2015
 call_write_iter include/linux/fs.h:2050 [inline]
 new_sync_write fs/read_write.c:504 [inline]
 vfs_write+0xcf0/0x1810 fs/read_write.c:591
 ksys_write+0x21b/0x4e0 fs/read_write.c:644
 __do_sys_write fs/read_write.c:656 [inline]
 __se_sys_write fs/read_write.c:653 [inline]
 __x64_sys_write+0x8f/0xd0 fs/read_write.c:653
 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+0x44/0xae

CPU: 1 PID: 20189 Comm: syz-executor.0 Not tainted 5.18.0-syzkaller-16266-gfb61e40b30d1 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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