[v5.15] BUG: unable to handle kernel NULL pointer dereference in bq_xmit_all

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 83655231580b Linux 5.15.159
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=1382be58980000
kernel config: https://syzkaller.appspot.com/x/.config?x=c49fc0ce9b46e64b
dashboard link: https://syzkaller.appspot.com/bug?extid=d1cd08dfa4381fd6c214
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/faa8b26e9d92/disk-83655231.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/dacb199b57cf/vmlinux-83655231.xz
kernel image: https://storage.googleapis.com/syzbot-assets/d7c5b8943497/Image-83655231.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d1cd08...@syzkaller.appspotmail.com

exFAT-fs (loop4): failed to load upcase table (idx : 0x000104d0, chksum : 0x60d18cac, utbl_chksum : 0xe619d30d)
Process accounting resumed
Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000
Mem abort info:
ESR = 0x0000000086000006
EC = 0x21: IABT (current EL), IL = 32 bits
SET = 0, FnV = 0
EA = 0, S1PTW = 0
FSC = 0x06: level 2 translation fault
user pgtable: 4k pages, 48-bit VAs, pgdp=000000011c630000
[0000000000000000] pgd=0800000116763003, p4d=0800000116763003, pud=080000010ca72003, pmd=0000000000000000
Internal error: Oops: 0000000086000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 7483 Comm: syz-executor.4 Not tainted 5.15.159-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : 0x0
lr : bond_xdp_xmit+0x310/0x4f4 drivers/net/bonding/bond_main.c:5235
sp : ffff80001d067360
x29: ffff80001d0674a0 x28: 1ffff00003a0ce8a x27: 1ffff00003a0ce86
x26: dfff800000000000 x25: ffff0000d90fa000 x24: ffff80001d067420
x23: ffff80001d067400 x22: ffff80001294d4d8 x21: fffffbffeff73400
x20: ffff0000d38b8140 x19: 0000000000000000 x18: 0000000000000200
x17: 0000000000000002 x16: ffff8000082e9eec x15: 0000000000000001
x14: ffff0000cc6d0000 x13: 0000000000ff0100 x12: 0000000000040000
x11: 0000000000000543 x10: ffff8000251d3000 x9 : 0000000000000544
x8 : 0000000000000000 x7 : 0000000000000000 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000001
x2 : ffff80001d067400 x1 : 0000000000000001 x0 : ffff0000d90fa000
Call trace:
0x0
bq_xmit_all+0xcf4/0x111c kernel/bpf/devmap.c:388
__dev_flush+0xc8/0x1a0 kernel/bpf/devmap.c:418
xdp_do_flush+0x14/0x28 net/core/filter.c:3942
tun_build_skb drivers/net/tun.c:1703 [inline]
tun_get_user+0x27d8/0x3774 drivers/net/tun.c:1797
tun_chr_write_iter+0xfc/0x20c drivers/net/tun.c:2019
call_write_iter include/linux/fs.h:2172 [inline]
new_sync_write fs/read_write.c:507 [inline]
vfs_write+0x87c/0xb3c 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
Code: bad PC value
---[ end trace 88228d24622f5867 ]---


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