wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready
==================================================================
BUG: KASAN: use-after-free in put_tty_queue drivers/tty/n_tty.c:304 [inline]
BUG: KASAN: use-after-free in n_tty_receive_buf_standard drivers/tty/n_tty.c:1564 [inline]
BUG: KASAN: use-after-free in __receive_buf drivers/tty/n_tty.c:1631 [inline]
BUG: KASAN: use-after-free in n_tty_receive_buf_common+0x1df0/0x2e40 drivers/tty/n_tty.c:1727
Read of size 1 at addr ffff8800947083c1 by task syz-executor.3/9536

CPU: 0 PID: 9536 Comm: syz-executor.3 Not tainted 4.18.0-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+0x15a/0x20d lib/dump_stack.c:113
 print_address_description.cold.6+0x9/0x211 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.7+0x242/0x308 mm/kasan/report.c:396
IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report.c:430
 put_tty_queue drivers/tty/n_tty.c:304 [inline]
 n_tty_receive_buf_standard drivers/tty/n_tty.c:1564 [inline]
 __receive_buf drivers/tty/n_tty.c:1631 [inline]
 n_tty_receive_buf_common+0x1df0/0x2e40 drivers/tty/n_tty.c:1727
 n_tty_receive_buf2+0xf/0x20 drivers/tty/n_tty.c:1762
 tty_ldisc_receive_buf+0x86/0x1b0 drivers/tty/tty_buffer.c:456
 paste_selection+0x253/0x3e0 drivers/tty/vt/selection.c:349
 tioclinux+0x10b/0x390 drivers/tty/vt/vt.c:2693
 vt_ioctl+0x187a/0x2120 drivers/tty/vt/vt_ioctl.c:362
 tty_ioctl+0x456/0x1280 drivers/tty/tty_io.c:2655
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x196/0x1050 fs/ioctl.c:684
 ksys_ioctl+0x62/0x90 fs/ioctl.c:701
 __do_sys_ioctl fs/ioctl.c:708 [inline]
 __se_sys_ioctl fs/ioctl.c:706 [inline]
 __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:706
 do_syscall_64+0xda/0x540 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7fd099f5f8d9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 
RSP: 002b:00007fd0996d6188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fd09a063f60 RCX: 00007fd099f5f8d9
RDX: 00000000200000c0 RSI: 000000000000541c RDI: 0000000000000005
RBP: 00007fd099fb9cb4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc27976d9f R14: 00007fd0996d6300 R15: 0000000000022000

Allocated by task 9528:
 save_stack mm/kasan/kasan.c:448 [inline]
 set_track mm/kasan/kasan.c:460 [inline]
 kasan_kmalloc.part.1+0x62/0xf0 mm/kasan/kasan.c:553
 kasan_kmalloc+0xaf/0xc0 mm/kasan/kasan.c:538
 __do_kmalloc mm/slab.c:3718 [inline]
 __kmalloc+0x151/0x400 mm/slab.c:3727
 kmalloc_array include/linux/slab.h:635 [inline]
 set_selection+0x657/0xe40 drivers/tty/vt/selection.c:283
 tioclinux+0xf6/0x390 drivers/tty/vt/vt.c:2689
 vt_ioctl+0x187a/0x2120 drivers/tty/vt/vt_ioctl.c:362
 tty_ioctl+0x456/0x1280 drivers/tty/tty_io.c:2655
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x196/0x1050 fs/ioctl.c:684
 ksys_ioctl+0x62/0x90 fs/ioctl.c:701
 __do_sys_ioctl fs/ioctl.c:708 [inline]
 __se_sys_ioctl fs/ioctl.c:706 [inline]
 __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:706
 do_syscall_64+0xda/0x540 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 9619:
 save_stack mm/kasan/kasan.c:448 [inline]
 set_track mm/kasan/kasan.c:460 [inline]
 __kasan_slab_free+0x13c/0x220 mm/kasan/kasan.c:521
 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
 __cache_free mm/slab.c:3498 [inline]
 kfree+0xcf/0x280 mm/slab.c:3813
 set_selection+0x67c/0xe40 drivers/tty/vt/selection.c:290
 tioclinux+0xf6/0x390 drivers/tty/vt/vt.c:2689
 vt_ioctl+0x187a/0x2120 drivers/tty/vt/vt_ioctl.c:362
 tty_ioctl+0x456/0x1280 drivers/tty/tty_io.c:2655
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x196/0x1050 fs/ioctl.c:684
 ksys_ioctl+0x62/0x90 fs/ioctl.c:701
 __do_sys_ioctl fs/ioctl.c:708 [inline]
 __se_sys_ioctl fs/ioctl.c:706 [inline]
 __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:706
 do_syscall_64+0xda/0x540 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8800947083c0
 which belongs to the cache kmalloc-8192 of size 8192
The buggy address is located 1 bytes inside of
 8192-byte region [ffff8800947083c0, ffff88009470a3c0)
The buggy address belongs to the page:
page:ffffea000251c200 count:1 mapcount:0 mapping:ffff8800b6002080 index:0x0 compound_mapcount: 0
flags: 0xfff00000008100(slab|head)
raw: 00fff00000008100 ffffea000252d808 ffffea0002b69408 ffff8800b6002080
raw: 0000000000000000 ffff8800947083c0 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected
page allocated via order 2, migratetype Unmovable, gfp_mask 0x442c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_COMP|__GFP_THISNODE)
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook mm/page_alloc.c:1906 [inline]
 prep_new_page mm/page_alloc.c:1914 [inline]
 get_page_from_freelist+0x2f35/0x46b0 mm/page_alloc.c:3345
 __alloc_pages_nodemask+0x39e/0x2780 mm/page_alloc.c:4369
 __alloc_pages include/linux/gfp.h:456 [inline]
 __alloc_pages_node include/linux/gfp.h:469 [inline]
 kmem_getpages mm/slab.c:1409 [inline]
 cache_grow_begin+0xa5/0x8c0 mm/slab.c:2677
 cache_alloc_refill+0x2ac/0x380 mm/slab.c:3044
 ____cache_alloc mm/slab.c:3127 [inline]
 __do_cache_alloc mm/slab.c:3349 [inline]
 slab_alloc mm/slab.c:3384 [inline]
 __do_kmalloc mm/slab.c:3716 [inline]
 __kmalloc+0x37b/0x400 mm/slab.c:3727
 kmalloc_array include/linux/slab.h:635 [inline]
 set_selection+0x657/0xe40 drivers/tty/vt/selection.c:283
 tioclinux+0xf6/0x390 drivers/tty/vt/vt.c:2689
 vt_ioctl+0x187a/0x2120 drivers/tty/vt/vt_ioctl.c:362
 tty_ioctl+0x456/0x1280 drivers/tty/tty_io.c:2655
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x196/0x1050 fs/ioctl.c:684
 ksys_ioctl+0x62/0x90 fs/ioctl.c:701
 __do_sys_ioctl fs/ioctl.c:708 [inline]
 __se_sys_ioctl fs/ioctl.c:706 [inline]
 __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:706
 do_syscall_64+0xda/0x540 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Memory state around the buggy address:
 ffff880094708280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff880094708300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff880094708380: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
                                           ^
 ffff880094708400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff880094708480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready