sctp: [Deprecated]: syz-executor.4 (pid 31944) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead ================================================================== BUG: KASAN: slab-out-of-bounds in sctp_setsockopt_delayed_ack net/sctp/socket.c:2773 [inline] BUG: KASAN: slab-out-of-bounds in sctp_setsockopt net/sctp/socket.c:4499 [inline] BUG: KASAN: slab-out-of-bounds in sctp_setsockopt+0x91b5/0x95e0 net/sctp/socket.c:4431 Write of size 4 at addr ffff8880a86d6608 by task syz-executor.4/31944 CPU: 0 PID: 31944 Comm: syz-executor.4 Not tainted 5.8.0-rc6-next-20200724-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+0x18f/0x20d 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 sctp_setsockopt_delayed_ack net/sctp/socket.c:2773 [inline] sctp_setsockopt net/sctp/socket.c:4499 [inline] sctp_setsockopt+0x91b5/0x95e0 net/sctp/socket.c:4431 __sys_setsockopt+0x337/0x6a0 net/socket.c:2137 __do_sys_setsockopt net/socket.c:2153 [inline] __se_sys_setsockopt net/socket.c:2150 [inline] __x64_sys_setsockopt+0xba/0x150 net/socket.c:2150 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45c1f9 Code: Bad RIP value. RSP: 002b:00007fa4d8f0dc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 000000000002e900 RCX: 000000000045c1f9 RDX: 0000000000000010 RSI: 0000000000000084 RDI: 0000000000000004 RBP: 000000000078bf50 R08: 0000000000000008 R09: 0000000000000000 R10: 0000000020000100 R11: 0000000000000246 R12: 000000000078bf0c R13: 00007ffcf90711af R14: 00007fa4d8f0e9c0 R15: 000000000078bf0c Allocated by task 31944: 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+0x1a6/0x310 mm/slab.c:3670 memdup_user+0x22/0xd0 mm/util.c:172 sctp_setsockopt net/sctp/socket.c:4452 [inline] sctp_setsockopt+0x17a/0x95e0 net/sctp/socket.c:4431 __sys_setsockopt+0x337/0x6a0 net/socket.c:2137 __do_sys_setsockopt net/socket.c:2153 [inline] __se_sys_setsockopt net/socket.c:2150 [inline] __x64_sys_setsockopt+0xba/0x150 net/socket.c:2150 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff8880a86d6600 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 8 bytes inside of 32-byte region [ffff8880a86d6600, ffff8880a86d6620) The buggy address belongs to the page: page:0000000009747e5b refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880a86d6fc1 pfn:0xa86d6 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea00028a1288 ffffea00027c1808 ffff8880aa000100 raw: ffff8880a86d6fc1 ffff8880a86d6000 000000010000003f 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a86d6500: fa fb fb fb fc fc fc fc 07 fc fc fc fc fc fc fc ffff8880a86d6580: 00 07 fc fc fc fc fc fc 07 fc fc fc fc fc fc fc >ffff8880a86d6600: 00 fc fc fc fc fc fc fc 05 fc fc fc fc fc fc fc ^ ffff8880a86d6680: 00 02 fc fc fc fc fc fc 06 fc fc fc fc fc fc fc ffff8880a86d6700: 07 fc fc fc fc fc fc fc 07 fc fc fc fc fc fc fc ==================================================================