syzbot

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BUG: KMSAN: uninit-value in erspan_build_header+0x170/0x2f0 include/net/erspan.h:197
 erspan_build_header+0x170/0x2f0 include/net/erspan.h:197
 erspan_xmit+0x116c/0x1ea0 net/ipv4/ip_gre.c:701
 __netdev_start_xmit include/linux/netdevice.h:4865 [inline]
 netdev_start_xmit include/linux/netdevice.h:4879 [inline]
 xmit_one+0x14e/0x5f0 net/core/dev.c:3583
 dev_hard_start_xmit+0xe5/0x370 net/core/dev.c:3599
 sch_direct_xmit+0x3f1/0xdb0 net/sched/sch_generic.c:342
 __dev_xmit_skb+0xc22/0x1a30 net/core/dev.c:3810
 __dev_queue_xmit+0x12cb/0x31f0 net/core/dev.c:4215
 dev_queue_xmit include/linux/netdevice.h:3035 [inline]
 __bpf_tx_skb net/core/filter.c:2117 [inline]
 __bpf_redirect_common net/core/filter.c:2161 [inline]
 __bpf_redirect+0x135d/0x1470 net/core/filter.c:2168
 ____bpf_clone_redirect net/core/filter.c:2437 [inline]
 bpf_clone_redirect+0x324/0x470 net/core/filter.c:2409
 ___bpf_prog_run+0x7ed/0xaee0 kernel/bpf/core.c:1820
 __bpf_prog_run512+0xc2/0x110 kernel/bpf/core.c:2045
 bpf_dispatcher_nop_func include/linux/bpf.h:1082 [inline]
 __bpf_prog_run include/linux/filter.h:600 [inline]
 bpf_prog_run include/linux/filter.h:607 [inline]
 bpf_test_run+0x592/0xd20 net/bpf/test_run.c:402
 bpf_prog_test_run_skb+0x1623/0x2090 net/bpf/test_run.c:1187
 bpf_prog_test_run+0x6a0/0x730 kernel/bpf/syscall.c:3644
 __sys_bpf+0x8a3/0xe90 kernel/bpf/syscall.c:4997
 __do_sys_bpf kernel/bpf/syscall.c:5083 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5081 [inline]
 __ia32_sys_bpf+0x9c/0xe0 kernel/bpf/syscall.c:5081
 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:766 [inline]
 slab_alloc_node mm/slub.c:3452 [inline]
 __kmem_cache_alloc_node+0x71f/0xce0 mm/slub.c:3491
 __do_kmalloc_node mm/slab_common.c:967 [inline]
 __kmalloc_node_track_caller+0x114/0x3b0 mm/slab_common.c:988
 kmalloc_reserve net/core/skbuff.c:492 [inline]
 pskb_expand_head+0x27c/0x1950 net/core/skbuff.c:1899
 __skb_cow include/linux/skbuff.h:3537 [inline]
 skb_cow_head include/linux/skbuff.h:3571 [inline]
 erspan_xmit+0xa9c/0x1ea0 net/ipv4/ip_gre.c:688
 __netdev_start_xmit include/linux/netdevice.h:4865 [inline]
 netdev_start_xmit include/linux/netdevice.h:4879 [inline]
 xmit_one+0x14e/0x5f0 net/core/dev.c:3583
 dev_hard_start_xmit+0xe5/0x370 net/core/dev.c:3599
 sch_direct_xmit+0x3f1/0xdb0 net/sched/sch_generic.c:342
 __dev_xmit_skb+0xc22/0x1a30 net/core/dev.c:3810
 __dev_queue_xmit+0x12cb/0x31f0 net/core/dev.c:4215
 dev_queue_xmit include/linux/netdevice.h:3035 [inline]
 __bpf_tx_skb net/core/filter.c:2117 [inline]
 __bpf_redirect_common net/core/filter.c:2161 [inline]
 __bpf_redirect+0x135d/0x1470 net/core/filter.c:2168
 ____bpf_clone_redirect net/core/filter.c:2437 [inline]
 bpf_clone_redirect+0x324/0x470 net/core/filter.c:2409
 ___bpf_prog_run+0x7ed/0xaee0 kernel/bpf/core.c:1820
 __bpf_prog_run512+0xc2/0x110 kernel/bpf/core.c:2045
 bpf_dispatcher_nop_func include/linux/bpf.h:1082 [inline]
 __bpf_prog_run include/linux/filter.h:600 [inline]
 bpf_prog_run include/linux/filter.h:607 [inline]
 bpf_test_run+0x592/0xd20 net/bpf/test_run.c:402
 bpf_prog_test_run_skb+0x1623/0x2090 net/bpf/test_run.c:1187
 bpf_prog_test_run+0x6a0/0x730 kernel/bpf/syscall.c:3644
 __sys_bpf+0x8a3/0xe90 kernel/bpf/syscall.c:4997
 __do_sys_bpf kernel/bpf/syscall.c:5083 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5081 [inline]
 __ia32_sys_bpf+0x9c/0xe0 kernel/bpf/syscall.c:5081
 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: 0 PID: 7599 Comm: syz-executor.4 Not tainted 6.2.0-rc3-syzkaller-79340-gc9a4e3bf8138 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
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