================================================================== BUG: KASAN: slab-out-of-bounds in ipv6_addr_equal include/net/ipv6.h:508 [inline] BUG: KASAN: slab-out-of-bounds in __sctp_v6_cmp_addr+0x4c7/0x530 net/sctp/ipv6.c:580 Read of size 8 at addr ffff8801d4927e50 by task syz-executor1/7075 CPU: 0 PID: 7075 Comm: syz-executor1 Not tainted 4.17.0-rc2+ #24 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+0x1b9/0x294 lib/dump_stack.c:113 print_address_description+0x6c/0x20b mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 ipv6_addr_equal include/net/ipv6.h:508 [inline] __sctp_v6_cmp_addr+0x4c7/0x530 net/sctp/ipv6.c:580 sctp_inet6_cmp_addr+0x169/0x1a0 net/sctp/ipv6.c:898 sctp_bind_addr_conflict+0x28c/0x470 net/sctp/bind_addr.c:368 sctp_get_port_local+0x9fc/0x1540 net/sctp/socket.c:7510 sctp_do_bind+0x21c/0x5f0 net/sctp/socket.c:435 sctp_bindx_add+0x90/0x1a0 net/sctp/socket.c:529 sctp_setsockopt_bindx+0x2ad/0x320 net/sctp/socket.c:1056 sctp_setsockopt+0x12c4/0x6b00 net/sctp/socket.c:4222 sock_common_setsockopt+0x9a/0xe0 net/core/sock.c:3042 __sys_setsockopt+0x1bd/0x390 net/socket.c:1903 __do_sys_setsockopt net/socket.c:1914 [inline] __se_sys_setsockopt net/socket.c:1911 [inline] __x64_sys_setsockopt+0xbe/0x150 net/socket.c:1911 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455979 RSP: 002b:00007f33bfaaac68 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007f33bfaab6d4 RCX: 0000000000455979 RDX: 0000000000000064 RSI: 0000000000000084 RDI: 0000000000000016 RBP: 000000000072bea0 R08: 0000000000000010 R09: 0000000000000000 R10: 0000000020000140 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000005eb R14: 00000000006fcea8 R15: 0000000000000000 Allocated by task 7075: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 __do_kmalloc_node mm/slab.c:3682 [inline] __kmalloc_node+0x47/0x70 mm/slab.c:3689 kmalloc_node include/linux/slab.h:554 [inline] kvmalloc_node+0x6b/0x100 mm/util.c:421 kvmalloc include/linux/mm.h:550 [inline] vmemdup_user+0x2d/0xa0 mm/util.c:186 sctp_setsockopt_bindx+0x5d/0x320 net/sctp/socket.c:1020 sctp_setsockopt+0x12c4/0x6b00 net/sctp/socket.c:4222 sock_common_setsockopt+0x9a/0xe0 net/core/sock.c:3042 __sys_setsockopt+0x1bd/0x390 net/socket.c:1903 __do_sys_setsockopt net/socket.c:1914 [inline] __se_sys_setsockopt net/socket.c:1911 [inline] __x64_sys_setsockopt+0xbe/0x150 net/socket.c:1911 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 1: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xd9/0x260 mm/slab.c:3813 kobject_uevent_env+0x275/0xea0 lib/kobject_uevent.c:551 kobject_uevent+0x1f/0x30 lib/kobject_uevent.c:568 tty_register_device_attr+0x49a/0x730 drivers/tty/tty_io.c:2994 tty_register_device drivers/tty/tty_io.c:2907 [inline] tty_register_driver+0x50e/0xb50 drivers/tty/tty_io.c:3178 vty_init+0x3b1/0x3ee drivers/tty/vt/vt.c:3104 tty_init+0x18d/0x192 drivers/tty/tty_io.c:3336 chr_dev_init+0x146/0x158 drivers/char/mem.c:942 do_one_initcall+0x127/0x913 init/main.c:883 do_initcall_level init/main.c:951 [inline] do_initcalls init/main.c:959 [inline] do_basic_setup init/main.c:977 [inline] kernel_init_freeable+0x49b/0x58e init/main.c:1127 kernel_init+0x11/0x1b3 init/main.c:1053 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 The buggy address belongs to the object at ffff8801d4927e40 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 16 bytes inside of 32-byte region [ffff8801d4927e40, ffff8801d4927e60) The buggy address belongs to the page: page:ffffea00075249c0 count:1 mapcount:0 mapping:ffff8801d4927000 index:0xffff8801d4927fc1 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffff8801d4927000 ffff8801d4927fc1 000000010000003f raw: ffffea00075212e0 ffffea0007524ce0 ffff8801da8001c0 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801d4927d00: fb fb fb fb fc fc fc fc 04 fc fc fc fc fc fc fc ffff8801d4927d80: 05 fc fc fc fc fc fc fc 05 fc fc fc fc fc fc fc >ffff8801d4927e00: 05 fc fc fc fc fc fc fc 00 00 fc fc fc fc fc fc ^ ffff8801d4927e80: 04 fc fc fc fc fc fc fc 05 fc fc fc fc fc fc fc ffff8801d4927f00: 05 fc fc fc fc fc fc fc 06 fc fc fc fc fc fc fc ==================================================================