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SubjectRe: [syzbot] [jfs?] UBSAN: array-index-out-of-bounds in xtSearch
syzbot has found a reproducer for the following issue on:

HEAD commit: 72a85e2b0a1e Merge tag 'spi-fix-v6.2-rc1' of git://git.ker..
git tree: upstream
console output:
kernel config:
dashboard link:
compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:

Downloadable assets:
disk image:
kernel image:
mounted in repro:

IMPORTANT: if you fix the issue, please add the following tag to the commit:

UBSAN: array-index-out-of-bounds in fs/jfs/jfs_xtree.c:360:4
index 19 is out of range for type 'xad_t [18]'
CPU: 1 PID: 5414 Comm: syz-executor.0 Not tainted 6.1.0-syzkaller-14594-g72a85e2b0a1e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1b1/0x290 lib/dump_stack.c:106
ubsan_epilogue lib/ubsan.c:151 [inline]
__ubsan_handle_out_of_bounds+0xe0/0x110 lib/ubsan.c:282
xtSearch+0x709/0x1cb0 fs/jfs/jfs_xtree.c:360
xtLookup+0x235/0x880 fs/jfs/jfs_xtree.c:152
extHint+0x204/0x630 fs/jfs/jfs_extent.c:215
jfs_get_block+0x2e3/0xce0 fs/jfs/inode.c:246
get_more_blocks fs/direct-io.c:665 [inline]
do_direct_IO fs/direct-io.c:953 [inline]
__blockdev_direct_IO+0x1737/0x3bf0 fs/direct-io.c:1266
blockdev_direct_IO include/linux/fs.h:3213 [inline]
jfs_direct_IO+0xf6/0x1e0 fs/jfs/inode.c:331
generic_file_direct_write+0x294/0x610 mm/filemap.c:3696
__generic_file_write_iter+0x1c4/0x400 mm/filemap.c:3856
generic_file_write_iter+0xab/0x310 mm/filemap.c:3932
do_iter_write+0x6c2/0xc20 fs/read_write.c:861
iter_file_splice_write+0x7fc/0xfc0 fs/splice.c:686
do_splice_from fs/splice.c:764 [inline]
direct_splice_actor+0xe6/0x1c0 fs/splice.c:931
splice_direct_to_actor+0x4e4/0xc00 fs/splice.c:886
do_splice_direct+0x279/0x3d0 fs/splice.c:974
do_sendfile+0x5fb/0xf80 fs/read_write.c:1255
__do_sys_sendfile64 fs/read_write.c:1323 [inline]
__se_sys_sendfile64+0x14f/0x1b0 fs/read_write.c:1309
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
RIP: 0033:0x7f9065c8c0a9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f90669ab168 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f9065dac050 RCX: 00007f9065c8c0a9
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000007
RBP: 00007f9065ce7ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 000080001d00c0d0 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe07df477f R14: 00007f90669ab300 R15: 0000000000022000

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