[v5.15] WARNING in br_nf_local_in (2)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 91786f140358 Linux 5.15.175
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=12ba54b0580000
kernel config: https://syzkaller.appspot.com/x/.config?x=792c138814af56fb
dashboard link: https://syzkaller.appspot.com/bug?extid=e59a203c1efd4ba4e6f8
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: arm64

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/703bce36932e/disk-91786f14.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/f72d0cd34063/vmlinux-91786f14.xz
kernel image: https://storage.googleapis.com/syzbot-assets/3ea47692ed8c/Image-91786f14.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+e59a20...@syzkaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 0 PID: 8056 at net/bridge/br_netfilter_hooks.c:634 br_nf_local_in+0x42c/0x4a4 net/bridge/br_netfilter_hooks.c:634
Modules linked in:
CPU: 0 PID: 8056 Comm: syz.2.964 Not tainted 5.15.175-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : br_nf_local_in+0x42c/0x4a4 net/bridge/br_netfilter_hooks.c:634
lr : br_nf_local_in+0x42c/0x4a4 net/bridge/br_netfilter_hooks.c:634
sp : ffff800020a368d0
x29: ffff800020a368f0
x28: ffff0000e957f510 x27: 0000000000000010
x26: 0000000000000180 x25: 1fffe0001eb3c418 x24: dfff800000000000
x23: ffff8000137160c0 x22: ffff0000f59e20c0 x21: ffff0000f73073c0
x20: 0000000000000000
x19: 0000000000000180 x18: 0000000000000402
x17: 0000000000000000 x16: ffff8000084c43f0 x15: 0000000000000088
x14: 1ffff0000296e06c x13: dfff800000000000 x12: 0000000000000003
x11: 0000000000000200 x10: 0000000000000000 x9 : ffff0000d3160000
x8 : ffff800010d1538c x7 : 0000000000000000 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff800008046154
x2 : 0000000000000001
x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
br_nf_local_in+0x42c/0x4a4 net/bridge/br_netfilter_hooks.c:634
nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline]
nf_hook_slow+0xc8/0x1f4 net/netfilter/core.c:584
nf_hook include/linux/netfilter.h:257 [inline]
NF_HOOK+0x2b0/0x3e0 include/linux/netfilter.h:300
br_pass_frame_up+0x29c/0x3ec net/bridge/br_input.c:70
br_handle_frame_finish+0xe94/0x1264
br_nf_pre_routing_finish+0x1190/0x1a4c net/bridge/br_netfilter_hooks.c:429
NF_HOOK+0x690/0x740 include/linux/netfilter.h:302
br_nf_pre_routing+0xb04/0x102c net/bridge/br_netfilter_hooks.c:538
nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline]
nf_hook_bridge_pre net/bridge/br_input.c:242 [inline]
br_handle_frame+0x86c/0xedc net/bridge/br_input.c:384
__netif_receive_skb_core+0xf10/0x341c net/core/dev.c:5387
__netif_receive_skb_one_core net/core/dev.c:5491 [inline]
__netif_receive_skb+0x114/0x400 net/core/dev.c:5607
netif_receive_skb_internal net/core/dev.c:5693 [inline]
netif_receive_skb+0x1e0/0x8c4 net/core/dev.c:5752
tun_rx_batched+0x568/0x6e4
tun_get_user+0x2320/0x3774 drivers/net/tun.c:1989
tun_chr_write_iter+0xfc/0x20c drivers/net/tun.c:2019
call_write_iter include/linux/fs.h:2174 [inline]
new_sync_write fs/read_write.c:507 [inline]
vfs_write+0x884/0xb44 fs/read_write.c:594
ksys_write+0x15c/0x26c fs/read_write.c:647
__do_sys_write fs/read_write.c:659 [inline]
__se_sys_write fs/read_write.c:656 [inline]
__arm64_sys_write+0x7c/0x90 fs/read_write.c:656
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
irq event stamp: 167
hardirqs last enabled at (166): [<ffff8000081b59a4>] __local_bh_enable_ip+0x230/0x470 kernel/softirq.c:388
hardirqs last disabled at (167): [<ffff800011b4a1ac>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:396
softirqs last enabled at (80): [<ffff80000c9b4030>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:31
softirqs last disabled at (82): [<ffff80000c9b3ffc>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:18
---[ end trace a738a5416e23d627 ]---


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[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit: 91786f140358 Linux 5.15.175
git tree: linux-5.15.y

console output: https://syzkaller.appspot.com/x/log.txt?x=10b401df980000

kernel config: https://syzkaller.appspot.com/x/.config?x=792c138814af56fb
dashboard link: https://syzkaller.appspot.com/bug?extid=e59a203c1efd4ba4e6f8
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: arm64

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1426cef8580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1226cef8580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/703bce36932e/disk-91786f14.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/f72d0cd34063/vmlinux-91786f14.xz
kernel image: https://storage.googleapis.com/syzbot-assets/3ea47692ed8c/Image-91786f14.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+e59a20...@syzkaller.appspotmail.com

------------[ cut here ]------------

WARNING: CPU: 1 PID: 4086 at net/bridge/br_netfilter_hooks.c:634 br_nf_local_in+0x42c/0x4a4 net/bridge/br_netfilter_hooks.c:634
Modules linked in:
CPU: 1 PID: 4086 Comm: syz-executor303 Not tainted 5.15.175-syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : br_nf_local_in+0x42c/0x4a4 net/bridge/br_netfilter_hooks.c:634
lr : br_nf_local_in+0x42c/0x4a4 net/bridge/br_netfilter_hooks.c:634

sp : ffff8000204d68d0
x29: ffff8000204d68f0 x28: ffff0000e4bde010 x27: 0000000000000010
x26: 0000000000000180 x25: 1fffe00018f3ecd8 x24: dfff800000000000
x23: ffff8000137160c0 x22: ffff0000c79f66c0 x21: ffff0000e49f5640
x20: 0000000000000000 x19: 0000000000000180 x18: ffff8000204d6460
x17: 0000000000000000 x16: ffff8000084c43f0 x15: 000000000001164a
x14: ffff8000171ff500 x13: dfff800000000000 x12: 0000000000000003
x11: 0000000000000200 x10: 0000000000000000 x9 : ffff0000cc7051c0

irq event stamp: 293
hardirqs last enabled at (292): [<ffff8000081b59a4>] __local_bh_enable_ip+0x230/0x470 kernel/softirq.c:388
hardirqs last disabled at (293): [<ffff800011b4a1ac>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:396
softirqs last enabled at (152): [<ffff80000c9b4030>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:31
softirqs last disabled at (154): [<ffff80000c9b3ffc>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:18
---[ end trace f1ccb3f10ed2ad6a ]---
Zero length message leads to an empty skb


---
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[syzbot]

Auto-closing this bug as obsolete.
No recent activity, existing reproducers are no longer triggering the issue.