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BUG: KASAN: slab-out-of-bounds in squashfs_get_id+0x1ae/0x1d0 fs/squashfs/id.c:38
Read of size 8 at addr ffff8880a77706b8 by task syz-executor.1/27782

CPU: 0 PID: 27782 Comm: syz-executor.1 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+0x198/0x1fd lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0xae/0x497 mm/kasan/report.c:383
 __kasan_report mm/kasan/report.c:513 [inline]
 kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530
 squashfs_get_id+0x1ae/0x1d0 fs/squashfs/id.c:38
 squashfs_new_inode fs/squashfs/inode.c:51 [inline]
 squashfs_read_inode+0x197/0x1940 fs/squashfs/inode.c:120
 squashfs_fill_super+0x1079/0x1ecf fs/squashfs/super.c:310
 get_tree_bdev+0x421/0x740 fs/super.c:1342
 vfs_get_tree+0x89/0x2f0 fs/super.c:1547
 do_new_mount fs/namespace.c:2875 [inline]
 path_mount+0x1387/0x20a0 fs/namespace.c:3192
 do_mount fs/namespace.c:3205 [inline]
 __do_sys_mount fs/namespace.c:3413 [inline]
 __se_sys_mount fs/namespace.c:3390 [inline]
 __x64_sys_mount+0x27f/0x300 fs/namespace.c:3390
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x46004a
Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 fd 89 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 89 fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007fa14ed8ea88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fa14ed8eb20 RCX: 000000000046004a
RDX: 0000000020000040 RSI: 0000000020000100 RDI: 00007fa14ed8eae0
RBP: 00007fa14ed8eae0 R08: 00007fa14ed8eb20 R09: 0000000020000040
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000040
R13: 0000000020000100 R14: 0000000020000200 R15: 0000000020000180

Allocated by task 6898:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48
 kasan_set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:461
 __do_kmalloc mm/slab.c:3655 [inline]
 __kmalloc_track_caller+0x1ae/0x360 mm/slab.c:3670
 kstrdup+0x36/0x70 mm/util.c:60
 kstrdup_const+0x53/0x80 mm/util.c:82
 __kernfs_new_node+0x9d/0x8b0 fs/kernfs/dir.c:623
 kernfs_new_node fs/kernfs/dir.c:689 [inline]
 kernfs_create_dir_ns+0x9c/0x220 fs/kernfs/dir.c:1026
 sysfs_create_dir_ns+0x127/0x290 fs/sysfs/dir.c:59
 create_dir lib/kobject.c:89 [inline]
 kobject_add_internal+0x2c3/0x940 lib/kobject.c:255
 kobject_add_varg lib/kobject.c:390 [inline]
 kobject_init_and_add+0x101/0x160 lib/kobject.c:473
 netdev_queue_add_kobject net/core/net-sysfs.c:1553 [inline]
 netdev_queue_update_kobjects+0x128/0x3c0 net/core/net-sysfs.c:1598
 register_queue_kobjects net/core/net-sysfs.c:1659 [inline]
 netdev_register_kobject+0x2ee/0x3b0 net/core/net-sysfs.c:1902
 register_netdevice+0xd6b/0x1630 net/core/dev.c:9830
 veth_newlink+0x533/0x9f0 drivers/net/veth.c:1378
 __rtnl_newlink+0x108b/0x1740 net/core/rtnetlink.c:3441
 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3500
 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5563
 netlink_rcv_skb+0x15a/0x430 net/netlink/af_netlink.c:2470
 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline]
 netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330
 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1919
 sock_sendmsg_nosec net/socket.c:651 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:671
 __sys_sendto+0x21c/0x320 net/socket.c:1992
 __do_sys_sendto net/socket.c:2004 [inline]
 __se_sys_sendto net/socket.c:2000 [inline]
 __x64_sys_sendto+0xdd/0x1b0 net/socket.c:2000
 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 ffff8880a7770680
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 24 bytes to the right of
 32-byte region [ffff8880a7770680, ffff8880a77706a0)
The buggy address belongs to the page:
page:000000000cfb9a1e refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880a7770fc1 pfn:0xa7770
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea00024a00c8 ffffea000287f848 ffff8880aa040100
raw: ffff8880a7770fc1 ffff8880a7770000 000000010000002f 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a7770580: fa fb fb fb fc fc fc fc 00 fc fc fc fc fc fc fc
 ffff8880a7770600: 00 01 fc fc fc fc fc fc fa fb fb fb fc fc fc fc
>ffff8880a7770680: 05 fc fc fc fc fc fc fc fb fb fb fb fc fc fc fc
                                        ^
 ffff8880a7770700: 00 02 fc fc fc fc fc fc 00 fc fc fc fc fc fc fc
 ffff8880a7770780: 05 fc fc fc fc fc fc fc fa fb fb fb fc fc fc fc
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