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UBSAN: array-index-out-of-bounds in fs/jfs/jfs_xtree.c:633:9
index 19 is out of range for type 'xad_t[18]' (aka 'struct xad[18]')
CPU: 1 PID: 4206 Comm: syz.1.23 Not tainted 5.15.173-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
Call trace:
 dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 dump_stack+0x1c/0x58 lib/dump_stack.c:113
 ubsan_epilogue lib/ubsan.c:151 [inline]
 __ubsan_handle_out_of_bounds+0x108/0x15c lib/ubsan.c:282
 xtInsert+0xca8/0xd28 fs/jfs/jfs_xtree.c:633
 extAlloc+0x8fc/0xe68 fs/jfs/jfs_extent.c:148
 jfs_get_block+0x34c/0xbfc fs/jfs/inode.c:258
 nobh_write_begin+0x2d8/0xa28 fs/buffer.c:2650
 jfs_write_begin+0x58/0xa0 fs/jfs/inode.c:322
 generic_perform_write+0x24c/0x520 mm/filemap.c:3785
 __generic_file_write_iter+0x230/0x454 mm/filemap.c:3912
 generic_file_write_iter+0xb4/0x1b8 mm/filemap.c:3944
 do_iter_readv_writev+0x420/0x5f8
 do_iter_write+0x1b8/0x66c fs/read_write.c:855
 vfs_iter_write+0x88/0xac fs/read_write.c:896
 iter_file_splice_write+0x618/0xc48 fs/splice.c:689
 do_splice_from fs/splice.c:767 [inline]
 direct_splice_actor+0xe4/0x1c0 fs/splice.c:936
 splice_direct_to_actor+0x408/0x9a0 fs/splice.c:891
 do_splice_direct+0x1f4/0x334 fs/splice.c:979
 do_sendfile+0x4c0/0xcb0 fs/read_write.c:1249
 __do_sys_sendfile64 fs/read_write.c:1311 [inline]
 __se_sys_sendfile64 fs/read_write.c:1303 [inline]
 __arm64_sys_sendfile64+0x264/0x408 fs/read_write.c:1303
 __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
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