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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 ffff88809c2bc2e8 by task syz-executor.0/14514

CPU: 0 PID: 14514 Comm: syz-executor.0 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:51 [inline]
 squashfs_read_inode+0x155/0x2170 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:00007f0bd559ea88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f0bd559eb20 RCX: 0000000000460bca
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f0bd559eae0
RBP: 00007f0bd559eae0 R08: 00007f0bd559eb20 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000
R13: 0000000020000100 R14: 0000000020000200 R15: 0000000020010200

Allocated by task 14514:
 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:3655 [inline]
 __kmalloc+0x205/0x300 mm/slab.c:3664
 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 ffff88809c2bc2c0
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 8 bytes to the right of
 32-byte region [ffff88809c2bc2c0, ffff88809c2bc2e0)
The buggy address belongs to the page:
page:000000007ab29802 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88809c2bcfc1 pfn:0x9c2bc
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea000286e048 ffffea0002a578c8 ffff8880aa440100
raw: ffff88809c2bcfc1 ffff88809c2bc000 000000010000003f 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88809c2bc180: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
 ffff88809c2bc200: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
>ffff88809c2bc280: fa fb fb fb fc fc fc fc 00 fc fc fc fc fc fc fc
                                                          ^
 ffff88809c2bc300: fa fb fb fb fc fc fc fc 06 fc fc fc fc fc fc fc
 ffff88809c2bc380: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
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