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BUG: KASAN: slab-out-of-bounds in squashfs_get_id+0xb9/0x1c0 fs/squashfs/id.c:38
Read of size 8 at addr ffff888040893718 by task syz-executor.5/15154

CPU: 0 PID: 15154 Comm: syz-executor.5 Not tainted 5.9.0-rc6-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+0x1d6/0x29e lib/dump_stack.c:118
 print_address_description+0x66/0x620 mm/kasan/report.c:383
 __kasan_report mm/kasan/report.c:513 [inline]
 kasan_report+0x132/0x1d0 mm/kasan/report.c:530
 squashfs_get_id+0xb9/0x1c0 fs/squashfs/id.c:38
 squashfs_new_inode fs/squashfs/inode.c:55 [inline]
 squashfs_read_inode+0x19b/0x2170 fs/squashfs/inode.c:120
 squashfs_fill_super+0x1478/0x1790 fs/squashfs/super.c:310
 get_tree_bdev+0x3e9/0x5f0 fs/super.c:1342
 vfs_get_tree+0x88/0x270 fs/super.c:1547
 do_new_mount fs/namespace.c:2875 [inline]
 path_mount+0x179d/0x29e0 fs/namespace.c:3192
 do_mount fs/namespace.c:3205 [inline]
 __do_sys_mount fs/namespace.c:3413 [inline]
 __se_sys_mount+0x126/0x180 fs/namespace.c:3390
 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x460bca
Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 dd 87 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 ba 87 fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007f83be7c1a88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f83be7c1b20 RCX: 0000000000460bca
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f83be7c1ae0
RBP: 00007f83be7c1ae0 R08: 00007f83be7c1b20 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000
R13: 0000000020000100 R14: 0000000020000200 R15: 0000000020010200

Allocated by task 15154:
 kasan_save_stack mm/kasan/common.c:48 [inline]
 kasan_set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc+0x100/0x130 mm/kasan/common.c:461
 __do_kmalloc mm/slab.c:3659 [inline]
 __kmalloc+0x205/0x300 mm/slab.c:3668
 kmalloc include/linux/slab.h:559 [inline]
 squashfs_read_table+0x2b/0x370 fs/squashfs/cache.c:413
 squashfs_read_id_index_table+0x56/0xd0 fs/squashfs/id.c:77
 squashfs_fill_super+0xf32/0x1790 fs/squashfs/super.c:238
 get_tree_bdev+0x3e9/0x5f0 fs/super.c:1342
 vfs_get_tree+0x88/0x270 fs/super.c:1547
 do_new_mount fs/namespace.c:2875 [inline]
 path_mount+0x179d/0x29e0 fs/namespace.c:3192
 do_mount fs/namespace.c:3205 [inline]
 __do_sys_mount fs/namespace.c:3413 [inline]
 __se_sys_mount+0x126/0x180 fs/namespace.c:3390
 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

The buggy address belongs to the object at ffff888040893700
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 24 bytes inside of
 32-byte region [ffff888040893700, ffff888040893720)
The buggy address belongs to the page:
page:000000002df25d63 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888040893fc1 pfn:0x40893
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea0002992488 ffffea000116b248 ffff8880aa440100
raw: ffff888040893fc1 ffff888040893000 000000010000003f 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888040893600: fa fb fb fb fc fc fc fc 04 fc fc fc fc fc fc fc
 ffff888040893680: 04 fc fc fc fc fc fc fc 00 fc fc fc fc fc fc fc
>ffff888040893700: 00 fc fc fc fc fc fc fc 05 fc fc fc fc fc fc fc
                            ^
 ffff888040893780: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
 ffff888040893800: 00 fc fc fc fc fc fc fc fa fb fb fb fc fc fc fc
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