syzbot

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BUG: KMSAN: uninit-value in eth_type_trans+0x632/0x990 net/ethernet/eth.c:176
 eth_type_trans+0x632/0x990 net/ethernet/eth.c:176
 __dev_forward_skb2+0x3cc/0x900 net/core/dev.c:2190
 dev_forward_skb_nomtu+0x3c/0xe0 net/core/dev.c:2229
 __bpf_rx_skb net/core/filter.c:2104 [inline]
 __bpf_redirect_common net/core/filter.c:2179 [inline]
 __bpf_redirect+0x13a6/0x1690 net/core/filter.c:2186
 ____bpf_clone_redirect net/core/filter.c:2460 [inline]
 bpf_clone_redirect+0x37e/0x500 net/core/filter.c:2430
 ___bpf_prog_run+0x13fe/0xe0f0 kernel/bpf/core.c:2015
 __bpf_prog_run512+0xc5/0xf0 kernel/bpf/core.c:2258
 bpf_dispatcher_nop_func include/linux/bpf.h:1290 [inline]
 __bpf_prog_run include/linux/filter.h:701 [inline]
 bpf_prog_run include/linux/filter.h:708 [inline]
 bpf_test_run+0x546/0xd20 net/bpf/test_run.c:434
 bpf_prog_test_run_skb+0x18c4/0x2570 net/bpf/test_run.c:1095
 bpf_prog_test_run+0x5e5/0xa30 kernel/bpf/syscall.c:4402
 __sys_bpf+0x6aa/0xd90 kernel/bpf/syscall.c:5808
 __do_sys_bpf kernel/bpf/syscall.c:5897 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5895 [inline]
 __x64_sys_bpf+0xa0/0xe0 kernel/bpf/syscall.c:5895
 x64_sys_call+0x329c/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:322
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was created at:
 slab_post_alloc_hook mm/slub.c:4125 [inline]
 slab_alloc_node mm/slub.c:4168 [inline]
 kmem_cache_alloc_node_noprof+0x907/0xe00 mm/slub.c:4220
 kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:587
 pskb_expand_head+0x226/0x1a60 net/core/skbuff.c:2275
 skb_ensure_writable+0x496/0x520 net/core/skbuff.c:6214
 __bpf_try_make_writable net/core/filter.c:1665 [inline]
 bpf_try_make_writable net/core/filter.c:1671 [inline]
 bpf_try_make_head_writable net/core/filter.c:1679 [inline]
 ____bpf_clone_redirect net/core/filter.c:2454 [inline]
 bpf_clone_redirect+0x1c5/0x500 net/core/filter.c:2430
 ___bpf_prog_run+0x13fe/0xe0f0 kernel/bpf/core.c:2015
 __bpf_prog_run512+0xc5/0xf0 kernel/bpf/core.c:2258
 bpf_dispatcher_nop_func include/linux/bpf.h:1290 [inline]
 __bpf_prog_run include/linux/filter.h:701 [inline]
 bpf_prog_run include/linux/filter.h:708 [inline]
 bpf_test_run+0x546/0xd20 net/bpf/test_run.c:434
 bpf_prog_test_run_skb+0x18c4/0x2570 net/bpf/test_run.c:1095
 bpf_prog_test_run+0x5e5/0xa30 kernel/bpf/syscall.c:4402
 __sys_bpf+0x6aa/0xd90 kernel/bpf/syscall.c:5808
 __do_sys_bpf kernel/bpf/syscall.c:5897 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5895 [inline]
 __x64_sys_bpf+0xa0/0xe0 kernel/bpf/syscall.c:5895
 x64_sys_call+0x329c/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:322
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 0 UID: 0 PID: 5810 Comm: syz-executor378 Not tainted 6.13.0-rc4-syzkaller-00054-gd6ef8b40d075 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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