[syzbot] UBSAN: shift-out-of-bounds in dbJoin

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    62e6e5940c0c Merge tag 'scsi-misc' of git://git.kernel.org..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=16347cc8880000
kernel config:  https://syzkaller.appspot.com/x/.config?x=4c13637ccca17699
dashboard link: https://syzkaller.appspot.com/bug?extid=411debe54d318eaed386
compiler:       Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1768f51c880000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=175885cc880000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/b4f4f04cf38f/disk-62e6e594.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/dfb013b64867/vmlinux-62e6e594.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/64992a1b07af/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+411debe54d318eaed386@xxxxxxxxxxxxxxxxxxxxxxxxx

================================================================================
UBSAN: shift-out-of-bounds in fs/jfs/jfs_dmap.c:2760:11
shift exponent 78 is too large for 32-bit type 'int'
CPU: 1 PID: 122 Comm: jfsCommit Not tainted 6.0.0-syzkaller-07362-g62e6e5940c0c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106
 ubsan_epilogue lib/ubsan.c:151 [inline]
 __ubsan_handle_shift_out_of_bounds+0x33d/0x3b0 lib/ubsan.c:322
 dbJoin+0x2e4/0x2f0 fs/jfs/jfs_dmap.c:2760
 dbAdjCtl+0x3b1/0x9c0 fs/jfs/jfs_dmap.c:2500
 dbFreeDmap fs/jfs/jfs_dmap.c:2064 [inline]
 dbFree+0x3c6/0x660 fs/jfs/jfs_dmap.c:379
 txFreeMap+0x97c/0xd70 fs/jfs/jfs_txnmgr.c:2510
 xtTruncate+0xe74/0x32d0 fs/jfs/jfs_xtree.c:2467
 jfs_free_zero_link+0x3f5/0x680 fs/jfs/namei.c:758
 jfs_evict_inode+0x35a/0x440 fs/jfs/inode.c:153
 evict+0x2a4/0x620 fs/inode.c:664
 txUpdateMap+0x8eb/0xaa0 fs/jfs/jfs_txnmgr.c:2362
 txLazyCommit fs/jfs/jfs_txnmgr.c:2659 [inline]
 jfs_lazycommit+0x433/0xba0 fs/jfs/jfs_txnmgr.c:2727
 kthread+0x266/0x300 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
 </TASK>
================================================================================


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