[syzbot] [jfs?] UBSAN: shift-out-of-bounds in dbSplit (3)

[syzbot <syzbot+4c1966e88c28fa96e053@syzkaller.appspotmail.com>]

Hello,

syzbot found the following issue on:

HEAD commit:    f1a3944c860b Merge tag 'bpf-fixes' of git://git.kernel.org..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10d550d4580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=90837c100b88a636
dashboard link: https://syzkaller.appspot.com/bug?extid=4c1966e88c28fa96e053
compiler:       Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1250a270580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14d550d4580000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-f1a3944c.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/fbe8c2bb0602/vmlinux-f1a3944c.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b4268e0ec733/bzImage-f1a3944c.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/10b2c382300e/mount_0.gz
  fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=14f49d74580000)

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+4c1966e88c28fa96e053@syzkaller.appspotmail.com

loop0: detected capacity change from 0 to 32768
------------[ cut here ]------------
UBSAN: shift-out-of-bounds in fs/jfs/jfs_dmap.c:2629:11
shift exponent 110 is too large for 32-bit type 'int'
CPU: 0 UID: 0 PID: 5303 Comm: syz-executor956 Not tainted 6.15.0-rc3-syzkaller-00283-gf1a3944c860b #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 ubsan_epilogue+0xa/0x40 lib/ubsan.c:231
 __ubsan_handle_shift_out_of_bounds+0x386/0x410 lib/ubsan.c:492
 dbSplit+0x1f8/0x200 fs/jfs/jfs_dmap.c:2629
 dbAdjCtl+0x34c/0xa20 fs/jfs/jfs_dmap.c:2521
 dbAllocDmap fs/jfs/jfs_dmap.c:2032 [inline]
 dbAllocNear+0x2ee/0x3d0 fs/jfs/jfs_dmap.c:1243
 dbAlloc+0x933/0xba0 fs/jfs/jfs_dmap.c:828
 ea_write+0x374/0xdd0 fs/jfs/xattr.c:232
 ea_put fs/jfs/xattr.c:619 [inline]
 __jfs_setxattr+0xa01/0x1120 fs/jfs/xattr.c:792
 __jfs_xattr_set+0xda/0x170 fs/jfs/xattr.c:941
 __vfs_setxattr+0x439/0x480 fs/xattr.c:200
 __vfs_setxattr_noperm+0x12d/0x660 fs/xattr.c:234
 vfs_setxattr+0x16b/0x2f0 fs/xattr.c:321
 do_setxattr fs/xattr.c:636 [inline]
 filename_setxattr+0x274/0x600 fs/xattr.c:665
 path_setxattrat+0x364/0x3a0 fs/xattr.c:713
 __do_sys_lsetxattr fs/xattr.c:754 [inline]
 __se_sys_lsetxattr fs/xattr.c:750 [inline]
 __x64_sys_lsetxattr+0xbf/0xe0 fs/xattr.c:750
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdaa19996b9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 17 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:00007fffe3d43d28 EFLAGS: 00000246 ORIG_RAX: 00000000000000bd
RAX: ffffffffffffffda RBX: 0000200000000200 RCX: 00007fdaa19996b9
RDX: 0000000000000000 RSI: 0000200000000200 RDI: 0000200000000040
RBP: 00002000000000c0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000000040
R13: 0031656c69662f2e R14: 0000000000000001 R15: 0000000000000001
 </TASK>
---[ end trace ]---


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