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UBSAN: array-index-out-of-bounds in fs/jfs/jfs_dmap.c:2862:31
index -3 is out of range for type 's8 [1365]'
CPU: 1 PID: 1967 Comm: syz-executor.4 Not tainted 6.1.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 ubsan_epilogue+0xb/0x50 lib/ubsan.c:151
 __ubsan_handle_out_of_bounds.cold+0x62/0x6c lib/ubsan.c:283
 dbAdjTree+0x30c/0x360 fs/jfs/jfs_dmap.c:2862
 dbAdjCtl+0x35c/0x900 fs/jfs/jfs_dmap.c:2498
 dbAllocDmap+0xb7/0x110 fs/jfs/jfs_dmap.c:2009
 dbAllocNext+0x34a/0x410 fs/jfs/jfs_dmap.c:1152
 dbAlloc+0x323/0xa70 fs/jfs/jfs_dmap.c:786
 extBalloc fs/jfs/jfs_extent.c:321 [inline]
 extAlloc+0x4e7/0xeb0 fs/jfs/jfs_extent.c:122
 jfs_get_block+0x661/0xa90 fs/jfs/inode.c:248
 __block_write_begin_int+0x3b9/0x14b0 fs/buffer.c:1991
 __block_write_begin fs/buffer.c:2041 [inline]
 block_write_begin+0xb5/0x4d0 fs/buffer.c:2102
 jfs_write_begin+0x2d/0xd0 fs/jfs/inode.c:304
 generic_perform_write+0x252/0x570 mm/filemap.c:3753
 __generic_file_write_iter+0x2aa/0x4d0 mm/filemap.c:3881
 generic_file_write_iter+0xdf/0x350 mm/filemap.c:3913
 __kernel_write_iter+0x25e/0x730 fs/read_write.c:517
 dump_emit_page fs/coredump.c:857 [inline]
 dump_user_range+0x230/0x700 fs/coredump.c:908
 elf_core_dump+0x26de/0x3510 fs/binfmt_elf.c:2311
 do_coredump+0x26c5/0x3bc0 fs/coredump.c:755
 get_signal+0x1be1/0x2430 kernel/signal.c:2844
 arch_do_signal_or_restart+0x82/0x2300 arch/x86/kernel/signal.c:869
 exit_to_user_mode_loop kernel/entry/common.c:168 [inline]
 exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:203
 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
 syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:296
 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f3143e3d757
Code: 08 89 3c 24 48 89 4c 24 18 e8 e5 f8 ff ff 4c 8b 54 24 18 48 8b 54 24 10 41 89 c0 48 8b 74 24 08 8b 3c 24 b8 12 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 04 24 e8 15 f9 ff ff 48 8b
RSP: 002b:00007f3144f85f00 EFLAGS: 00000293 ORIG_RAX: 0000000000000012
RAX: ffffffffffffffe5 RBX: 0000000000000322 RCX: 00007f3143e3d757
RDX: 0000000700000007 RSI: 0000000400000009 RDI: 0000000000000007
RBP: 0000000000000007 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000100000000 R11: 0000000000000293 R12: 0000000000000007
R13: 0000000020000200 R14: 0000000000000000 R15: 00007f3143ed5a20
 </TASK>
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