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BUG: KASAN: use-after-free in diFree+0x1883/0x29c0 fs/jfs/jfs_imap.c:886
Read of size 4 at addr ffff88804a386f44 by task syz-executor.3/22070

CPU: 1 PID: 22070 Comm: syz-executor.3 Not tainted 4.19.198-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256
 kasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354
 kasan_report mm/kasan/report.c:412 [inline]
 __asan_report_load4_noabort+0x88/0x90 mm/kasan/report.c:432
 diFree+0x1883/0x29c0 fs/jfs/jfs_imap.c:886
 jfs_evict_inode+0x1a1/0x210 fs/jfs/inode.c:165
 evict+0x2ed/0x760 fs/inode.c:559
 iput_final fs/inode.c:1555 [inline]
 iput+0x4f1/0x860 fs/inode.c:1581
 diFreeSpecial fs/jfs/jfs_imap.c:563 [inline]
 diFreeSpecial+0x63/0x80 fs/jfs/jfs_imap.c:555
 jfs_mount+0x23f/0x3d0 fs/jfs/jfs_mount.c:223
 jfs_fill_super+0x55c/0xb50 fs/jfs/super.c:589
 mount_bdev+0x2fc/0x3b0 fs/super.c:1158
 mount_fs+0xa3/0x310 fs/super.c:1261
 vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961
 vfs_kern_mount fs/namespace.c:951 [inline]
 do_new_mount fs/namespace.c:2469 [inline]
 do_mount+0x113c/0x2f10 fs/namespace.c:2799
 ksys_mount+0xcf/0x130 fs/namespace.c:3015
 __do_sys_mount fs/namespace.c:3029 [inline]
 __se_sys_mount fs/namespace.c:3026 [inline]
 __x64_sys_mount+0xba/0x150 fs/namespace.c:3026
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x467b0a
Code: 48 c7 c2 bc ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f7afd71cfa8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 0000000000467b0a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f7afd71d000
RBP: 00007f7afd71d040 R08: 00007f7afd71d040 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000
R13: 0000000020000100 R14: 00007f7afd71d000 R15: 0000000020000080

The buggy address belongs to the page:
page:ffffea000128e180 count:0 mapcount:0 mapping:0000000000000000 index:0xffff88804a386e40
flags: 0xfff00000000000()
raw: 00fff00000000000 0000000000000000 dead000000000200 0000000000000000
raw: ffff88804a386e40 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88804a386e00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88804a386e80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88804a386f00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                           ^
 ffff88804a386f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88804a387000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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