------------[ cut here ]------------
WARNING: CPU: 1 PID: 5593 at fs/gfs2/rgrp.c:2638 gfs2_check_blk_type+0x360/0x560
Modules linked in:
CPU: 1 PID: 5593 Comm: syz-executor.4 Not tainted 5.15.157-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
pstate: 80401005 (Nzcv daif +PAN -UAO -TCO -DIT +SSBS BTYPE=--)
pc : gfs2_check_blk_type+0x360/0x560
lr : rgrp_contains_block fs/gfs2/rgrp.h:87 [inline]
lr : gfs2_rbm_from_block fs/gfs2/rgrp.c:279 [inline]
lr : gfs2_check_blk_type+0x2dc/0x560 fs/gfs2/rgrp.c:2637
sp : ffff80001d347680
x29: ffff80001d347740 x28: 1fffe0001d4fe806 x27: ffff0000ea7f4000
x26: dfff800000000000 x25: ffff700003a68ed4 x24: 00000000fffffff9
x23: 0000000000000013 x22: ffff0000ea7f4034 x21: 0000000000000012
x20: 1fffe0001d4fe805 x19: ffff80001d3476c0 x18: 1fffe0003690198e
x17: 1fffe0003690198e x16: ffff8000082eaf20 x15: ffff8000149dec20
x14: 1ffff0000292806a x13: dfff800000000000 x12: 0000000000040000
x11: 0000000000005a1c x10: ffff8000201ba000 x9 : 0000000000005a1d
x8 : ffff80000a2f1510 x7 : ffff80000a293244 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff800008305a68
x2 : 0000000000000000 x1 : 0000000000000012 x0 : 0000000000000013
Call trace:
 gfs2_check_blk_type+0x360/0x560
 gfs2_inode_lookup+0x4f0/0xbd8 fs/gfs2/inode.c:177
 gfs2_lookup_by_inum+0x60/0xf8 fs/gfs2/inode.c:250
 gfs2_get_dentry fs/gfs2/export.c:139 [inline]
 gfs2_fh_to_dentry+0x128/0x1f4 fs/gfs2/export.c:162
 exportfs_decode_fh_raw+0x114/0x4b4 fs/exportfs/expfs.c:436
 exportfs_decode_fh+0x50/0x80 fs/exportfs/expfs.c:576
 do_handle_to_path fs/fhandle.c:152 [inline]
 handle_to_path fs/fhandle.c:207 [inline]
 do_handle_open+0x5b8/0x9fc fs/fhandle.c:223
 __do_sys_open_by_handle_at fs/fhandle.c:265 [inline]
 __se_sys_open_by_handle_at fs/fhandle.c:256 [inline]
 __arm64_sys_open_by_handle_at+0x80/0x94 fs/fhandle.c:256
 __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: 146238
hardirqs last  enabled at (146237): [<ffff800008269adc>] raw_spin_rq_unlock_irq kernel/sched/sched.h:1338 [inline]
hardirqs last  enabled at (146237): [<ffff800008269adc>] finish_lock_switch+0xbc/0x1e8 kernel/sched/core.c:4784
hardirqs last disabled at (146238): [<ffff800011993408>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:396
softirqs last  enabled at (146192): [<ffff80000a291934>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:31
softirqs last disabled at (146190): [<ffff80000a291900>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:18
---[ end trace f6b7f11e43d2006d ]---
Zero length message leads to an empty skb