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BUG: KMSAN: uninit-value in erspan_build_header+0x16d/0x330
 erspan_build_header+0x16d/0x330
 erspan_xmit+0x11a2/0x1f00 net/ipv4/ip_gre.c:701
 __netdev_start_xmit include/linux/netdevice.h:4805 [inline]
 netdev_start_xmit include/linux/netdevice.h:4819 [inline]
 xmit_one+0x14e/0x5f0 net/core/dev.c:3590
 dev_hard_start_xmit+0xe5/0x370 net/core/dev.c:3606
 sch_direct_xmit+0x3f1/0xdb0 net/sched/sch_generic.c:342
 __dev_xmit_skb+0xbe9/0x19e0 net/core/dev.c:3817
 __dev_queue_xmit+0x12cb/0x31f0 net/core/dev.c:4221
 dev_queue_xmit include/linux/netdevice.h:2994 [inline]
 __bpf_tx_skb net/core/filter.c:2114 [inline]
 __bpf_redirect_common net/core/filter.c:2153 [inline]
 __bpf_redirect+0x1277/0x1430 net/core/filter.c:2160
 ____bpf_clone_redirect net/core/filter.c:2429 [inline]
 bpf_clone_redirect+0x324/0x470 net/core/filter.c:2401
 ___bpf_prog_run+0x7ed/0xaee0 kernel/bpf/core.c:1852
 __bpf_prog_run512+0xc2/0x110 kernel/bpf/core.c:2077
 bpf_dispatcher_nop_func include/linux/bpf.h:869 [inline]
 __bpf_prog_run include/linux/filter.h:628 [inline]
 bpf_prog_run include/linux/filter.h:635 [inline]
 bpf_test_run+0x592/0xd20 net/bpf/test_run.c:402
 bpf_prog_test_run_skb+0x1625/0x20b0 net/bpf/test_run.c:1155
 bpf_prog_test_run+0x6a0/0x730 kernel/bpf/syscall.c:3591
 __sys_bpf+0x9e8/0xeb0 kernel/bpf/syscall.c:4935
 __do_sys_bpf kernel/bpf/syscall.c:5021 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5019 [inline]
 __ia32_sys_bpf+0x9c/0xe0 kernel/bpf/syscall.c:5019
 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
 __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178
 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203
 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:246
 entry_SYSENTER_compat_after_hwframe+0x70/0x82

Uninit was created at:
 slab_post_alloc_hook mm/slab.h:755 [inline]
 slab_alloc_node mm/slub.c:3258 [inline]
 __kmalloc_node_track_caller+0x86c/0x1230 mm/slub.c:4994
 kmalloc_reserve net/core/skbuff.c:354 [inline]
 pskb_expand_head+0x1aa/0x1a00 net/core/skbuff.c:1695
 __skb_cow include/linux/skbuff.h:3633 [inline]
 skb_cow_head include/linux/skbuff.h:3667 [inline]
 erspan_xmit+0xad2/0x1f00 net/ipv4/ip_gre.c:688
 __netdev_start_xmit include/linux/netdevice.h:4805 [inline]
 netdev_start_xmit include/linux/netdevice.h:4819 [inline]
 xmit_one+0x14e/0x5f0 net/core/dev.c:3590
 dev_hard_start_xmit+0xe5/0x370 net/core/dev.c:3606
 sch_direct_xmit+0x3f1/0xdb0 net/sched/sch_generic.c:342
 __dev_xmit_skb+0xbe9/0x19e0 net/core/dev.c:3817
 __dev_queue_xmit+0x12cb/0x31f0 net/core/dev.c:4221
 dev_queue_xmit include/linux/netdevice.h:2994 [inline]
 __bpf_tx_skb net/core/filter.c:2114 [inline]
 __bpf_redirect_common net/core/filter.c:2153 [inline]
 __bpf_redirect+0x1277/0x1430 net/core/filter.c:2160
 ____bpf_clone_redirect net/core/filter.c:2429 [inline]
 bpf_clone_redirect+0x324/0x470 net/core/filter.c:2401
 ___bpf_prog_run+0x7ed/0xaee0 kernel/bpf/core.c:1852
 __bpf_prog_run512+0xc2/0x110 kernel/bpf/core.c:2077
 bpf_dispatcher_nop_func include/linux/bpf.h:869 [inline]
 __bpf_prog_run include/linux/filter.h:628 [inline]
 bpf_prog_run include/linux/filter.h:635 [inline]
 bpf_test_run+0x592/0xd20 net/bpf/test_run.c:402
 bpf_prog_test_run_skb+0x1625/0x20b0 net/bpf/test_run.c:1155
 bpf_prog_test_run+0x6a0/0x730 kernel/bpf/syscall.c:3591
 __sys_bpf+0x9e8/0xeb0 kernel/bpf/syscall.c:4935
 __do_sys_bpf kernel/bpf/syscall.c:5021 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5019 [inline]
 __ia32_sys_bpf+0x9c/0xe0 kernel/bpf/syscall.c:5019
 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
 __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178
 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203
 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:246
 entry_SYSENTER_compat_after_hwframe+0x70/0x82

CPU: 1 PID: 6936 Comm: syz-executor.2 Not tainted 5.19.0-syzkaller-32655-g1b070a5d1a2c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
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