KASAN: use-after-free Read in __llc_lookup

Title	Replies (including bot)	Last reply
[PATCH 4.9 000/171] 4.9.136-stable review	176 (176)	2018/11/09 21:55
[PATCH 4.14 000/143] 4.14.79-stable review	166 (166)	2018/11/06 10:55
[PATCH 4.18 000/150] 4.18.17-stable review	156 (156)	2018/11/05 13:09
[Patch net] llc: set SOCK_RCU_FREE in llc_sap_add_socket()	2 (2)	2018/10/16 05:02
KASAN: use-after-free Read in __llc_lookup_established	0 (1)	2018/10/11 05:50

================================================================== BUG: KASAN: use-after-free in llc_estab_match net/llc/llc_conn.c:494 [inline] BUG: KASAN: use-after-free in __llc_lookup_established+0xc80/0xe10 net/llc/llc_conn.c:522 Read of size 1 at addr ffff8801c5794a7f by task syz-executor3/10277 CPU: 0 PID: 10277 Comm: syz-executor3 Not tainted 4.19.0-rc7+ #55 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+0x1c4/0x2b4 lib/dump_stack.c:113 print_address_description.cold.8+0x9/0x1ff mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.9+0x242/0x309 mm/kasan/report.c:412 net_ratelimit: 9 callbacks suppressed openvswitch: netlink: Key type 12288 is out of range max 29 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report.c:430 llc_estab_match net/llc/llc_conn.c:494 [inline] __llc_lookup_established+0xc80/0xe10 net/llc/llc_conn.c:522 openvswitch: netlink: Key type 12288 is out of range max 29 llc_lookup_established+0x36/0x60 net/llc/llc_conn.c:554 llc_ui_bind+0x810/0xdd0 net/llc/af_llc.c:381 __sys_bind+0x331/0x440 net/socket.c:1483 __do_sys_bind net/socket.c:1494 [inline] __se_sys_bind net/socket.c:1492 [inline] __x64_sys_bind+0x73/0xb0 net/socket.c:1492 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457579 Code: 1d b4 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 eb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f2a18100c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000031 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457579 RDX: 0000000000000010 RSI: 0000000020000040 RDI: 0000000000000006 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2a181016d4 R13: 00000000004bd718 R14: 00000000004cbfe0 R15: 00000000ffffffff Allocated by task 10278: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553 __do_kmalloc mm/slab.c:3718 [inline] __kmalloc+0x14e/0x760 mm/slab.c:3727 kmalloc include/linux/slab.h:518 [inline] sk_prot_alloc+0x1b0/0x2e0 net/core/sock.c:1468 sk_alloc+0x10d/0x1690 net/core/sock.c:1522 llc_sk_alloc+0x35/0x4b0 net/llc/llc_conn.c:949 llc_ui_create+0x142/0x520 net/llc/af_llc.c:173 __sock_create+0x536/0x930 net/socket.c:1277 sock_create net/socket.c:1317 [inline] __sys_socket+0x106/0x260 net/socket.c:1347 __do_sys_socket net/socket.c:1356 [inline] __se_sys_socket net/socket.c:1354 [inline] __x64_sys_socket+0x73/0xb0 net/socket.c:1354 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 10276: save_stack+0x43/0xd0 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:3498 [inline] kfree+0xcf/0x230 mm/slab.c:3813 sk_prot_free net/core/sock.c:1505 [inline] __sk_destruct+0x797/0xa80 net/core/sock.c:1587 sk_destruct+0x78/0x90 net/core/sock.c:1595 __sk_free+0xcf/0x300 net/core/sock.c:1606 sk_free+0x42/0x50 net/core/sock.c:1617 sock_put include/net/sock.h:1691 [inline] llc_sk_free+0x9d/0xb0 net/llc/llc_conn.c:1017 llc_ui_release+0x161/0x2a0 net/llc/af_llc.c:218 __sock_release+0xd7/0x250 net/socket.c:579 sock_close+0x19/0x20 net/socket.c:1141 __fput+0x385/0xa30 fs/file_table.c:278 ____fput+0x15/0x20 fs/file_table.c:309 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8801c5794600 which belongs to the cache kmalloc-2048 of size 2048 The buggy address is located 1151 bytes inside of 2048-byte region [ffff8801c5794600, ffff8801c5794e00) The buggy address belongs to the page: page:ffffea000715e500 count:1 mapcount:0 mapping:ffff8801da800c40 index:0x0 compound_mapcount: 0 flags: 0x2fffc0000008100(slab|head) raw: 02fffc0000008100 ffffea00075c0d88 ffffea0006f48908 ffff8801da800c40 raw: 0000000000000000 ffff8801c5794600 0000000100000003 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801c5794900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801c5794980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8801c5794a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8801c5794a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801c5794b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 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