netlink: 'syz-executor.4': attribute type 1 has an invalid length. ================================================================== BUG: KASAN: use-after-free in __fb_pad_aligned_buffer include/linux/fb.h:674 [inline] BUG: KASAN: use-after-free in bit_putcs_aligned drivers/video/fbdev/core/bitblit.c:96 [inline] BUG: KASAN: use-after-free in bit_putcs+0xd5d/0xf10 drivers/video/fbdev/core/bitblit.c:185 Read of size 1 at addr ffff888063cad488 by task syz-executor.0/3662 CPU: 0 PID: 3662 Comm: syz-executor.0 Not tainted 4.19.96-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+0x197/0x210 lib/dump_stack.c:118 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report mm/kasan/report.c:412 [inline] kasan_report.cold+0x8c/0x2ba mm/kasan/report.c:396 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report.c:430 __fb_pad_aligned_buffer include/linux/fb.h:674 [inline] bit_putcs_aligned drivers/video/fbdev/core/bitblit.c:96 [inline] bit_putcs+0xd5d/0xf10 drivers/video/fbdev/core/bitblit.c:185 fbcon_putcs+0x42b/0x4f0 drivers/video/fbdev/core/fbcon.c:1320 con_flush drivers/tty/vt/vt.c:2522 [inline] do_con_write.part.0+0xfb1/0x1eb0 drivers/tty/vt/vt.c:2772 do_con_write drivers/tty/vt/vt.c:2541 [inline] con_write+0x46/0xd0 drivers/tty/vt/vt.c:3110 process_output_block drivers/tty/n_tty.c:593 [inline] n_tty_write+0x3f9/0x1140 drivers/tty/n_tty.c:2331 do_tty_write drivers/tty/tty_io.c:960 [inline] tty_write+0x458/0x7a0 drivers/tty/tty_io.c:1044 do_loop_readv_writev fs/read_write.c:704 [inline] do_loop_readv_writev fs/read_write.c:688 [inline] do_iter_write fs/read_write.c:962 [inline] do_iter_write+0x488/0x5f0 fs/read_write.c:941 vfs_writev+0x1b3/0x2f0 fs/read_write.c:1005 do_writev+0x15e/0x370 fs/read_write.c:1040 __do_sys_writev fs/read_write.c:1113 [inline] __se_sys_writev fs/read_write.c:1110 [inline] __x64_sys_writev+0x75/0xb0 fs/read_write.c:1110 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45af49 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ff06b411c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045af49 RDX: 0000000000000001 RSI: 0000000020000300 RDI: 0000000000000003 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff06b4126d4 R13: 00000000004c957b R14: 00000000004e8c70 R15: 00000000ffffffff Allocated by task 3196: save_stack+0x45/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc mm/kasan/kasan.c:553 [inline] kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:531 __do_kmalloc mm/slab.c:3727 [inline] __kmalloc+0x15d/0x750 mm/slab.c:3736 kmalloc include/linux/slab.h:520 [inline] kzalloc include/linux/slab.h:709 [inline] new_dir fs/proc/proc_sysctl.c:951 [inline] get_subdir fs/proc/proc_sysctl.c:996 [inline] __register_sysctl_table+0x81c/0xef0 fs/proc/proc_sysctl.c:1339 register_net_sysctl+0x29/0x30 net/sysctl_net.c:120 __devinet_sysctl_register+0x17d/0x2c0 net/ipv4/devinet.c:2338 devinet_sysctl_register net/ipv4/devinet.c:2378 [inline] devinet_sysctl_register+0x167/0x220 net/ipv4/devinet.c:2368 inetdev_init+0x22e/0x470 net/ipv4/devinet.c:269 inetdev_event+0xe4c/0x1240 net/ipv4/devinet.c:1471 notifier_call_chain+0xc2/0x230 kernel/notifier.c:93 __raw_notifier_call_chain kernel/notifier.c:394 [inline] raw_notifier_call_chain+0x2e/0x40 kernel/notifier.c:401 call_netdevice_notifiers_info+0x3f/0x90 net/core/dev.c:1748 call_netdevice_notifiers net/core/dev.c:1766 [inline] register_netdevice+0xa4d/0xff0 net/core/dev.c:8756 register_netdev+0x30/0x50 net/core/dev.c:8847 vti6_init_net+0x518/0x820 net/ipv6/ip6_vti.c:1126 ops_init+0xb3/0x410 net/core/net_namespace.c:129 setup_net+0x2d3/0x740 net/core/net_namespace.c:315 copy_net_ns+0x1df/0x33c net/core/net_namespace.c:438 create_new_namespaces+0x400/0x7b0 kernel/nsproxy.c:107 unshare_nsproxy_namespaces+0xc2/0x200 kernel/nsproxy.c:206 ksys_unshare+0x440/0x980 kernel/fork.c:2520 __do_sys_unshare kernel/fork.c:2588 [inline] __se_sys_unshare kernel/fork.c:2586 [inline] __x64_sys_unshare+0x31/0x40 kernel/fork.c:2586 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 9: save_stack+0x45/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3503 [inline] kfree+0xcf/0x220 mm/slab.c:3822 __rcu_reclaim kernel/rcu/rcu.h:231 [inline] rcu_do_batch kernel/rcu/tree.c:2584 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2897 [inline] __rcu_process_callbacks kernel/rcu/tree.c:2864 [inline] rcu_process_callbacks+0xcb6/0x1a30 kernel/rcu/tree.c:2881 __do_softirq+0x25c/0x921 kernel/softirq.c:292 The buggy address belongs to the object at ffff888063cad300 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 392 bytes inside of 512-byte region [ffff888063cad300, ffff888063cad500) The buggy address belongs to the page: page:ffffea00018f2b40 count:1 mapcount:0 mapping:ffff88812c31c940 index:0xffff888063cada80 flags: 0xfffe0000000100(slab) raw: 00fffe0000000100 ffffea0000a0ac48 ffffea0001a06448 ffff88812c31c940 raw: ffff888063cada80 ffff888063cad080 0000000100000005 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888063cad380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888063cad400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888063cad480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888063cad500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888063cad580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================