================================================================== BUG: KASAN: slab-out-of-bounds in squashfs_get_id+0x1ae/0x1d0 fs/squashfs/id.c:51 Read of size 8 at addr ffff8880aa918528 by task syz-executor.0/17184 CPU: 1 PID: 17184 Comm: syz-executor.0 Not tainted 4.19.164-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/0x2fe lib/dump_stack.c:118 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256 kasan_report_error.cold+0x8a/0x1c7 mm/kasan/report.c:354 kasan_report mm/kasan/report.c:412 [inline] __asan_report_load8_noabort+0x88/0x90 mm/kasan/report.c:433 squashfs_get_id+0x1ae/0x1d0 fs/squashfs/id.c:51 squashfs_new_inode fs/squashfs/inode.c:64 [inline] squashfs_read_inode+0x1b4/0x1b40 fs/squashfs/inode.c:133 squashfs_fill_super+0x1655/0x1c00 fs/squashfs/super.c:318 mount_bdev+0x2fc/0x3b0 fs/super.c:1158 mount_fs+0xa3/0x30c 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:2469 [inline] do_mount+0x113c/0x2f10 fs/namespace.c:2799 ksys_mount+0xcf/0x130 fs/namespace.c:3015 __do_sys_mount fs/namespace.c:3029 [inline] __se_sys_mount fs/namespace.c:3026 [inline] __x64_sys_mount+0xba/0x150 fs/namespace.c:3026 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x460c6a Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 ad 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 8a 89 fb ff c3 66 0f 1f 84 00 00 00 00 00 RSP: 002b:00007f160f9a9a78 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f160f9a9b10 RCX: 0000000000460c6a RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f160f9a9ad0 RBP: 00007f160f9a9ad0 R08: 00007f160f9a9b10 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000 R13: 0000000020000100 R14: 0000000020000200 R15: 0000000020010300 Allocated by task 11336: __do_kmalloc mm/slab.c:3727 [inline] __kmalloc_track_caller+0x155/0x3c0 mm/slab.c:3742 kvasprintf+0xb5/0x150 lib/kasprintf.c:25 kvasprintf_const+0x60/0x190 lib/kasprintf.c:49 kobject_set_name_vargs+0x56/0x150 lib/kobject.c:281 kobject_add_varg lib/kobject.c:376 [inline] kobject_init_and_add+0xc9/0x160 lib/kobject.c:453 rx_queue_add_kobject net/core/net-sysfs.c:937 [inline] net_rx_queue_update_kobjects+0x1bb/0x450 net/core/net-sysfs.c:970 register_queue_kobjects net/core/net-sysfs.c:1546 [inline] netdev_register_kobject+0x279/0x430 net/core/net-sysfs.c:1769 register_netdevice+0xb46/0x10f0 net/core/dev.c:8717 __ip_tunnel_create+0x398/0x580 net/ipv4/ip_tunnel.c:280 ip_tunnel_init_net+0x330/0x990 net/ipv4/ip_tunnel.c:1025 ops_init+0xb3/0x410 net/core/net_namespace.c:129 setup_net+0x2c2/0x720 net/core/net_namespace.c:315 copy_net_ns+0x1f7/0x335 net/core/net_namespace.c:438 create_new_namespaces+0x3f6/0x7b0 kernel/nsproxy.c:107 unshare_nsproxy_namespaces+0xbd/0x1f0 kernel/nsproxy.c:206 ksys_unshare+0x36c/0x9a0 kernel/fork.c:2551 __do_sys_unshare kernel/fork.c:2619 [inline] __se_sys_unshare kernel/fork.c:2617 [inline] __x64_sys_unshare+0x2d/0x40 kernel/fork.c:2617 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 7: __cache_free mm/slab.c:3503 [inline] kfree+0xcc/0x210 mm/slab.c:3822 batadv_mcast_mla_list_free net/batman-adv/multicast.c:315 [inline] __batadv_mcast_mla_update net/batman-adv/multicast.c:631 [inline] batadv_mcast_mla_update+0x868/0x1bf0 net/batman-adv/multicast.c:654 process_one_work+0x864/0x1570 kernel/workqueue.c:2155 worker_thread+0x64c/0x1130 kernel/workqueue.c:2298 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 The buggy address belongs to the object at ffff8880aa918500 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 8 bytes to the right of 32-byte region [ffff8880aa918500, ffff8880aa918520) The buggy address belongs to the page: page:ffffea0002aa4600 count:1 mapcount:0 mapping:ffff88813bff01c0 index:0xffff8880aa918fc1 flags: 0xfff00000000100(slab) raw: 00fff00000000100 ffffea00028c8748 ffffea0002a73088 ffff88813bff01c0 raw: ffff8880aa918fc1 ffff8880aa918000 0000000100000038 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880aa918400: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ffff8880aa918480: 00 00 fc fc fc fc fc fc 00 fc fc fc fc fc fc fc >ffff8880aa918500: 05 fc fc fc fc fc fc fc fb fb fb fb fc fc fc fc ^ ffff8880aa918580: 00 00 fc fc fc fc fc fc 05 fc fc fc fc fc fc fc ffff8880aa918600: fb fb fb fb fc fc fc fc 05 fc fc fc fc fc fc fc ==================================================================