Re: [PATCH bpf-next] bpf: make sure skb->len != 0 when redirecting to a tunneling device

[patchwork-bot+netdevbpf@kernel.org]

Hello:

This patch was applied to bpf/bpf-next.git (master)
by Martin KaFai Lau <martin.lau@kernel.org>:

On Thu, 27 Oct 2022 15:55:37 -0700 you wrote:
> syzkaller managed to trigger another case where skb->len == 0
> when we enter __dev_queue_xmit:
> 
> WARNING: CPU: 0 PID: 2470 at include/linux/skbuff.h:2576 skb_assert_len include/linux/skbuff.h:2576 [inline]
> WARNING: CPU: 0 PID: 2470 at include/linux/skbuff.h:2576 __dev_queue_xmit+0x2069/0x35e0 net/core/dev.c:4295
> 
> Call Trace:
>  dev_queue_xmit+0x17/0x20 net/core/dev.c:4406
>  __bpf_tx_skb net/core/filter.c:2115 [inline]
>  __bpf_redirect_no_mac net/core/filter.c:2140 [inline]
>  __bpf_redirect+0x5fb/0xda0 net/core/filter.c:2163
>  ____bpf_clone_redirect net/core/filter.c:2447 [inline]
>  bpf_clone_redirect+0x247/0x390 net/core/filter.c:2419
>  bpf_prog_48159a89cb4a9a16+0x59/0x5e
>  bpf_dispatcher_nop_func include/linux/bpf.h:897 [inline]
>  __bpf_prog_run include/linux/filter.h:596 [inline]
>  bpf_prog_run include/linux/filter.h:603 [inline]
>  bpf_test_run+0x46c/0x890 net/bpf/test_run.c:402
>  bpf_prog_test_run_skb+0xbdc/0x14c0 net/bpf/test_run.c:1170
>  bpf_prog_test_run+0x345/0x3c0 kernel/bpf/syscall.c:3648
>  __sys_bpf+0x43a/0x6c0 kernel/bpf/syscall.c:5005
>  __do_sys_bpf kernel/bpf/syscall.c:5091 [inline]
>  __se_sys_bpf kernel/bpf/syscall.c:5089 [inline]
>  __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5089
>  do_syscall_64+0x54/0x70 arch/x86/entry/common.c:48
>  entry_SYSCALL_64_after_hwframe+0x61/0xc6
> 
> [...]

Here is the summary with links:
  - [bpf-next] bpf: make sure skb->len != 0 when redirecting to a tunneling device
    https://git.kernel.org/bpf/bpf-next/c/0ed041b1dd33

You are awesome, thank you!
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