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+0x3d0/0x910 net/core/dev.c:2377
 dev_forward_skb_nomtu+0x3c/0xe0 net/core/dev.c:2416
 __bpf_rx_skb net/core/filter.c:2104 [inline]
 __bpf_redirect_common net/core/filter.c:2179 [inline]
 __bpf_redirect+0x13a8/0x1690 net/core/filter.c:2186
 ____bpf_clone_redirect net/core/filter.c:2460 [inline]
 bpf_clone_redirect+0x37f/0x500 net/core/filter.c:2430
 ___bpf_prog_run+0x12fd/0xf0b0 kernel/bpf/core.c:2018
 __bpf_prog_run512+0xc5/0xf0 kernel/bpf/core.c:2313
 bpf_dispatcher_nop_func include/linux/bpf.h:1316 [inline]
 __bpf_prog_run include/linux/filter.h:718 [inline]
 bpf_prog_run include/linux/filter.h:725 [inline]
 bpf_test_run+0x546/0xd20 net/bpf/test_run.c:434
 bpf_prog_test_run_skb+0x1906/0x25b0 net/bpf/test_run.c:1093
 bpf_prog_test_run+0x5e5/0xa30 kernel/bpf/syscall.c:4427
 __sys_bpf+0x6ce/0xdf0 kernel/bpf/syscall.c:5852
 __do_sys_bpf kernel/bpf/syscall.c:5941 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5939 [inline]
 __x64_sys_bpf+0xa0/0xe0 kernel/bpf/syscall.c:5939
 x64_sys_call+0x2a32/0x3c80 arch/x86/include/generated/asm/syscalls_64.h:322
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was created at:
 slab_post_alloc_hook mm/slub.c:4157 [inline]
 slab_alloc_node mm/slub.c:4200 [inline]
 kmem_cache_alloc_node_noprof+0x921/0xe10 mm/slub.c:4252
 kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:577
 pskb_expand_head+0x21f/0x1c10 net/core/skbuff.c:2247
 skb_ensure_writable+0x496/0x520 net/core/skbuff.c:6241
 __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+0x12fd/0xf0b0 kernel/bpf/core.c:2018
 __bpf_prog_run512+0xc5/0xf0 kernel/bpf/core.c:2313
 bpf_dispatcher_nop_func include/linux/bpf.h:1316 [inline]
 __bpf_prog_run include/linux/filter.h:718 [inline]
 bpf_prog_run include/linux/filter.h:725 [inline]
 bpf_test_run+0x546/0xd20 net/bpf/test_run.c:434
 bpf_prog_test_run_skb+0x1906/0x25b0 net/bpf/test_run.c:1093
 bpf_prog_test_run+0x5e5/0xa30 kernel/bpf/syscall.c:4427
 __sys_bpf+0x6ce/0xdf0 kernel/bpf/syscall.c:5852
 __do_sys_bpf kernel/bpf/syscall.c:5941 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5939 [inline]
 __x64_sys_bpf+0xa0/0xe0 kernel/bpf/syscall.c:5939
 x64_sys_call+0x2a32/0x3c80 arch/x86/include/generated/asm/syscalls_64.h:322
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 0 UID: 0 PID: 5810 Comm: syz-executor300 Not tainted 6.14.0-syzkaller-13524-gf4d2ef48250a #0 PREEMPT(undef) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
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