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BUG: KASAN: slab-out-of-bounds in build_sit_entries fs/f2fs/segment.c:3961 [inline]
BUG: KASAN: slab-out-of-bounds in f2fs_build_segment_manager+0xa926/0xad90 fs/f2fs/segment.c:4230
Read of size 4 at addr ffff88804500f424 by task syz-executor.3/14754

CPU: 0 PID: 14754 Comm: syz-executor.3 Not tainted 4.19.210-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
 build_sit_entries fs/f2fs/segment.c:3961 [inline]
 f2fs_build_segment_manager+0xa926/0xad90 fs/f2fs/segment.c:4230
 f2fs_fill_super+0x31d9/0x7050 fs/f2fs/super.c:3016
 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:2492 [inline]
 do_mount+0x115c/0x2f50 fs/namespace.c:2822
 ksys_mount+0xcf/0x130 fs/namespace.c:3038
 __do_sys_mount fs/namespace.c:3052 [inline]
 __se_sys_mount fs/namespace.c:3049 [inline]
 __x64_sys_mount+0xba/0x150 fs/namespace.c:3049
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f7903124dfa
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:00007f7900699fa8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 00007f7903124dfa
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f790069a000
RBP: 00007f790069a040 R08: 00007f790069a040 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000020000000
R13: 0000000020000100 R14: 00007f790069a000 R15: 0000000020014b00

Allocated by task 14754:
 __do_kmalloc_node mm/slab.c:3689 [inline]
 __kmalloc_node+0x4c/0x70 mm/slab.c:3696
 kmalloc_node include/linux/slab.h:557 [inline]
 kvmalloc_node+0x61/0xf0 mm/util.c:423
 kvmalloc include/linux/mm.h:577 [inline]
 f2fs_kvmalloc fs/f2fs/f2fs.h:2687 [inline]
 f2fs_kvzalloc fs/f2fs/f2fs.h:2693 [inline]
 build_sit_info fs/f2fs/segment.c:3809 [inline]
 f2fs_build_segment_manager+0x213d/0xad90 fs/f2fs/segment.c:4219
 f2fs_fill_super+0x31d9/0x7050 fs/f2fs/super.c:3016
 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:2492 [inline]
 do_mount+0x115c/0x2f50 fs/namespace.c:2822
 ksys_mount+0xcf/0x130 fs/namespace.c:3038
 __do_sys_mount fs/namespace.c:3052 [inline]
 __se_sys_mount fs/namespace.c:3049 [inline]
 __x64_sys_mount+0xba/0x150 fs/namespace.c:3049
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 12868:
 __cache_free mm/slab.c:3503 [inline]
 kfree+0xcc/0x210 mm/slab.c:3822
 kvfree+0x59/0x60 mm/util.c:452
 f2fs_destroy_node_manager+0x84f/0xbd0 fs/f2fs/node.c:3121
 f2fs_put_super+0x49a/0x980 fs/f2fs/super.c:1068
 generic_shutdown_super+0x144/0x370 fs/super.c:456
 kill_block_super+0x97/0xf0 fs/super.c:1185
 kill_f2fs_super+0x241/0x330 fs/f2fs/super.c:3257
 deactivate_locked_super+0x94/0x160 fs/super.c:329
 deactivate_super+0x174/0x1a0 fs/super.c:360
 cleanup_mnt+0x1a8/0x290 fs/namespace.c:1098
 task_work_run+0x148/0x1c0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:193 [inline]
 exit_to_usermode_loop+0x251/0x2a0 arch/x86/entry/common.c:167
 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
 do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff88804500f400
 which belongs to the cache kmalloc-64 of size 64
The buggy address is located 36 bytes inside of
 64-byte region [ffff88804500f400, ffff88804500f440)
The buggy address belongs to the page:
page:ffffea00011403c0 count:1 mapcount:0 mapping:ffff88813bff0340 index:0x0
flags: 0xfff00000000100(slab)
raw: 00fff00000000100 ffffea00029b05c8 ffffea00006b3dc8 ffff88813bff0340
raw: 0000000000000000 ffff88804500f000 0000000100000020 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88804500f300: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff88804500f380: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff88804500f400: 00 00 00 00 04 fc fc fc fc fc fc fc fc fc fc fc
                               ^
 ffff88804500f480: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
 ffff88804500f500: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
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