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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 ffff8880139ddfd8 by task syz-executor029/8471

CPU: 0 PID: 8471 Comm: syz-executor029 Not tainted 5.10.0-rc2-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+0x137/0x1be lib/dump_stack.c:118
 print_address_description+0x6c/0x660 mm/kasan/report.c:385
 __kasan_report mm/kasan/report.c:545 [inline]
 kasan_report+0x136/0x1e0 mm/kasan/report.c:562
 squashfs_get_id+0xb9/0x1c0 fs/squashfs/id.c:38
 squashfs_new_inode fs/squashfs/inode.c:51 [inline]
 squashfs_read_inode+0x19d/0x2690 fs/squashfs/inode.c:120
 squashfs_fill_super+0x1665/0x1c90 fs/squashfs/super.c:310
 get_tree_bdev+0x3e9/0x5f0 fs/super.c:1344
 vfs_get_tree+0x88/0x270 fs/super.c:1549
 do_new_mount fs/namespace.c:2875 [inline]
 path_mount+0x17b4/0x2a20 fs/namespace.c:3205
 do_mount fs/namespace.c:3218 [inline]
 __do_sys_mount fs/namespace.c:3426 [inline]
 __se_sys_mount+0x28c/0x320 fs/namespace.c:3403
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x446d2a
Code: b8 08 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 fd ad 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 da ad fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007ffe07d05238 EFLAGS: 00000293 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffe07d05290 RCX: 0000000000446d2a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffe07d05250
RBP: 00007ffe07d05250 R08: 00007ffe07d05290 R09: 00007ffe00000015
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000001
R13: 0000000000000004 R14: 0000000000000003 R15: 0000000000000003

Allocated by task 6638:
 kasan_save_stack mm/kasan/common.c:48 [inline]
 kasan_set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc+0x111/0x140 mm/kasan/common.c:461
 __kmalloc+0x170/0x290 mm/slub.c:3970
 kmalloc include/linux/slab.h:557 [inline]
 kzalloc+0x1d/0x30 include/linux/slab.h:664
 smk_parse_smack+0x18e/0x220 security/smack/smack_access.c:468
 smk_import_entry+0x22/0x400 security/smack/smack_access.c:564
 smk_fetch security/smack/smack_lsm.c:298 [inline]
 smack_d_instantiate+0x6af/0xcc0 security/smack/smack_lsm.c:3409
 security_d_instantiate+0xa5/0x100 security/security.c:1973
 d_instantiate+0x51/0x90 fs/dcache.c:1973
 shmem_symlink+0x53e/0x6f0 mm/shmem.c:3191
 vfs_symlink+0x36f/0x500 fs/namei.c:3960
 do_symlinkat+0x18b/0x420 fs/namei.c:3987
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

The buggy address belongs to the object at ffff8880139ddfc8
 which belongs to the cache kmalloc-8 of size 8
The buggy address is located 8 bytes to the right of
 8-byte region [ffff8880139ddfc8, ffff8880139ddfd0)
The buggy address belongs to the page:
page:0000000086e48f61 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880139dd1e0 pfn:0x139dd
flags: 0xfff00000000200(slab)
raw: 00fff00000000200 ffffea000050e180 0000000700000007 ffff888010441c80
raw: ffff8880139dd1e0 0000000080660047 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880139dde80: fc fb fc fc fc fc fb fc fc fc fc fb fc fc fc fc
 ffff8880139ddf00: fb fc fc fc fc fa fc fc fc fc fb fc fc fc fc 00
>ffff8880139ddf80: fc fc fc fc fa fc fc fc fc fb fc fc fc fc fc fc
                                                    ^
 ffff8880139de000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8880139de080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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