Zero length message leads to an empty skb
------------[ cut here ]------------
kernel BUG at mm/hugetlb.c:1160!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 1 UID: 0 PID: 6599 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:resv_map_release+0x1df/0x1f0 mm/hugetlb.c:1160
Code: 57 cc a0 ff 4d 85 f6 75 1b e8 6d c7 a0 ff 48 89 df 48 83 c4 20 5b 41 5c 41 5d 41 5e 41 5f 5d e9 b7 de fa ff e8 52 c7 a0 ff 90 <0f> 0b 66 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90
RSP: 0018:ffffc90002e57778 EFLAGS: 00010293
RAX: ffffffff821f7c9e RBX: ffff88807e55c400 RCX: ffff8880259e0000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: dead000000000122 R08: ffffffff8f9e1e77 R09: 1ffffffff1f3c3ce
R10: dffffc0000000000 R11: fffffbfff1f3c3cf R12: ffff88807e55c460
R13: dffffc0000000000 R14: 0000000000000001 R15: ffff88807e55c460
FS:  0000000000000000(0000) GS:ffff888125e0b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000800000 CR3: 0000000032e2a000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 vma_close mm/internal.h:190 [inline]
 remove_vma+0x8b/0x130 mm/vma.c:464
 exit_mmap+0x537/0xb40 mm/mmap.c:1305
 __mmput+0x118/0x430 kernel/fork.c:1133
 exit_mm+0x1da/0x2c0 kernel/exit.c:582
 do_exit+0x648/0x2300 kernel/exit.c:954
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1107
 get_signal+0x1285/0x1340 kernel/signal.c:3034
 arch_do_signal_or_restart+0xa0/0x790 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop+0x72/0x130 kernel/entry/common.c:40
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
 do_syscall_64+0x2bd/0xfa0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f096c58eba9
Code: Unable to access opcode bytes at 0x7f096c58eb7f.
RSP: 002b:00007f096d4500e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f096c7d5fa8 RCX: 00007f096c58eba9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f096c7d5fa8
RBP: 00007f096c7d5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f096c7d6038 R14: 00007ffe2e2341b0 R15: 00007ffe2e234298
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:resv_map_release+0x1df/0x1f0 mm/hugetlb.c:1160
Code: 57 cc a0 ff 4d 85 f6 75 1b e8 6d c7 a0 ff 48 89 df 48 83 c4 20 5b 41 5c 41 5d 41 5e 41 5f 5d e9 b7 de fa ff e8 52 c7 a0 ff 90 <0f> 0b 66 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90
RSP: 0018:ffffc90002e57778 EFLAGS: 00010293
RAX: ffffffff821f7c9e RBX: ffff88807e55c400 RCX: ffff8880259e0000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: dead000000000122 R08: ffffffff8f9e1e77 R09: 1ffffffff1f3c3ce
R10: dffffc0000000000 R11: fffffbfff1f3c3cf R12: ffff88807e55c460
R13: dffffc0000000000 R14: 0000000000000001 R15: ffff88807e55c460
FS:  0000000000000000(0000) GS:ffff888125e0b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055e2c8266950 CR3: 0000000032e2a000 CR4: 00000000003526f0