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UBSAN: array-index-out-of-bounds in fs/jfs/jfs_xtree.c:622:9
index 19 is out of range for type 'xad_t[18]' (aka 'struct xad[18]')
CPU: 0 PID: 17118 Comm: syz-executor.5 Not tainted 6.6.0-rc7-syzkaller-00012-ge017769f4ce2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106
 ubsan_epilogue lib/ubsan.c:217 [inline]
 __ubsan_handle_out_of_bounds+0x11c/0x150 lib/ubsan.c:348
 xtInsert+0xf45/0xfa0 fs/jfs/jfs_xtree.c:622
 extAlloc+0xa74/0x1000 fs/jfs/jfs_extent.c:145
 jfs_get_block+0x41b/0xe60 fs/jfs/inode.c:248
 get_more_blocks fs/direct-io.c:647 [inline]
 do_direct_IO fs/direct-io.c:935 [inline]
 __blockdev_direct_IO+0x1cb9/0x4900 fs/direct-io.c:1248
 blockdev_direct_IO include/linux/fs.h:2969 [inline]
 jfs_direct_IO+0xf8/0x1e0 fs/jfs/inode.c:331
 generic_file_direct_write+0x1e3/0x3f0 mm/filemap.c:3894
 __generic_file_write_iter+0x125/0x230 mm/filemap.c:4050
 generic_file_write_iter+0xaf/0x310 mm/filemap.c:4090
 do_iter_write+0x84f/0xde0 fs/read_write.c:860
 vfs_writev fs/read_write.c:933 [inline]
 do_pwritev+0x21a/0x360 fs/read_write.c:1030
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fd74247cae9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd7431130c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000148
RAX: ffffffffffffffda RBX: 00007fd74259c050 RCX: 00007fd74247cae9
RDX: 0000000000000001 RSI: 0000000020000240 RDI: 0000000000000005
RBP: 00007fd7424c847a R08: 0000000000000000 R09: 0000000000000013
R10: 0000000000001400 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fd74259c050 R15: 00007ffd7829e2b8
 </TASK>
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