================================================================== BUG: KASAN: use-after-free in inet_ctl_sock_destroy include/net/inet_common.h:56 [inline] BUG: KASAN: use-after-free in tcp_sk_exit+0x203/0x230 net/ipv4/tcp_ipv4.c:2591 Read of size 8 at addr ffff88809184c57c by task kworker/u4:3/2395 CPU: 0 PID: 2395 Comm: kworker/u4:3 Not tainted 5.0.0-rc7+ #88 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x172/0x1f0 lib/dump_stack.c:113 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:135 inet_ctl_sock_destroy include/net/inet_common.h:56 [inline] tcp_sk_exit+0x203/0x230 net/ipv4/tcp_ipv4.c:2591 ops_exit_list.isra.0+0xb0/0x160 net/core/net_namespace.c:153 cleanup_net+0x3fb/0x960 net/core/net_namespace.c:551 IPVS: ftp: loaded support on port[0] = 21 process_one_work+0x98e/0x1790 kernel/workqueue.c:2173 worker_thread+0x98/0xe40 kernel/workqueue.c:2319 kthread+0x357/0x430 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Allocated by task 7631: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_kmalloc mm/kasan/common.c:495 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:468 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:503 slab_post_alloc_hook mm/slab.h:440 [inline] slab_alloc mm/slab.c:3388 [inline] kmem_cache_alloc+0x11a/0x6f0 mm/slab.c:3548 dup_mm kernel/fork.c:1311 [inline] copy_mm kernel/fork.c:1375 [inline] copy_process.part.0+0x2afe/0x79a0 kernel/fork.c:1917 copy_process kernel/fork.c:1710 [inline] _do_fork+0x257/0xfe0 kernel/fork.c:2227 __do_sys_clone kernel/fork.c:2334 [inline] __se_sys_clone kernel/fork.c:2328 [inline] __x64_sys_clone+0xbf/0x150 kernel/fork.c:2328 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 20698: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:457 kasan_slab_free+0xe/0x10 mm/kasan/common.c:465 __cache_free mm/slab.c:3494 [inline] kmem_cache_free+0x86/0x260 mm/slab.c:3754 __mmdrop+0x238/0x320 kernel/fork.c:678 mmdrop include/linux/sched/mm.h:49 [inline] __mmput kernel/fork.c:1057 [inline] mmput+0x3d6/0x4c0 kernel/fork.c:1068 exit_mm kernel/exit.c:545 [inline] do_exit+0x838/0x2fd0 kernel/exit.c:862 do_group_exit+0x135/0x370 kernel/exit.c:979 get_signal+0x399/0x1d50 kernel/signal.c:2575 do_signal+0x87/0x1940 arch/x86/kernel/signal.c:816 exit_to_usermode_loop+0x244/0x2c0 arch/x86/entry/common.c:162 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x52d/0x610 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff88809184c180 which belongs to the cache mm_struct(81:syz4) of size 1496 The buggy address is located 1020 bytes inside of 1496-byte region [ffff88809184c180, ffff88809184c758) The buggy address belongs to the page: page:ffffea0002461300 count:1 mapcount:0 mapping:ffff88806d258080 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea00018e4e08 ffffea00026bb308 ffff88806d258080 raw: 0000000000000000 ffff88809184c180 0000000100000004 ffff88809fcc2b80 page dumped because: kasan: bad access detected page->mem_cgroup:ffff88809fcc2b80 Memory state around the buggy address: ffff88809184c400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88809184c480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88809184c500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88809184c580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88809184c600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 net_ratelimit: 44213 callbacks suppressed bridge0: received packet on bridge_slave_0 with own address as source address (addr:00:00:ff:00:00:00, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:00:00:ff:00:00:00, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:00:00:ff:00:00:00, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:00:00:ff:00:00:00, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:00:00:ff:00:00:00, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:00:00:ff:00:00:00, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:00:00:ff:00:00:00, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:00:00:ff:00:00:00, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:00:00:ff:00:00:00, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:00:00:ff:00:00:00, vlan:0) IPVS: ftp: loaded support on port[0] = 21