================================================================== BUG: KASAN: use-after-free in __nf_ct_ext_exist include/net/netfilter/nf_conntrack_extend.h:53 [inline] BUG: KASAN: use-after-free in nf_ct_ext_exist include/net/netfilter/nf_conntrack_extend.h:58 [inline] BUG: KASAN: use-after-free in __nf_ct_ext_find include/net/netfilter/nf_conntrack_extend.h:63 [inline] BUG: KASAN: use-after-free in nf_ct_ecache_find include/net/netfilter/nf_conntrack_ecache.h:35 [inline] BUG: KASAN: use-after-free in nf_ct_deliver_cached_events+0x5c3/0x6d0 net/netfilter/nf_conntrack_ecache.c:205 Read of size 1 at addr ffff88809b955204 by task syz-executor245/8557 CPU: 1 PID: 8557 Comm: syz-executor245 Not tainted 5.4.0-rc4-next-20191024 #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+0x172/0x1f0 lib/dump_stack.c:113 print_address_description.constprop.0.cold+0xd4/0x30b mm/kasan/report.c:374 __kasan_report.cold+0x1b/0x41 mm/kasan/report.c:506 kasan_report+0x12/0x20 mm/kasan/common.c:634 __asan_report_load1_noabort+0x14/0x20 mm/kasan/generic_report.c:129 __nf_ct_ext_exist include/net/netfilter/nf_conntrack_extend.h:53 [inline] nf_ct_ext_exist include/net/netfilter/nf_conntrack_extend.h:58 [inline] __nf_ct_ext_find include/net/netfilter/nf_conntrack_extend.h:63 [inline] nf_ct_ecache_find include/net/netfilter/nf_conntrack_ecache.h:35 [inline] nf_ct_deliver_cached_events+0x5c3/0x6d0 net/netfilter/nf_conntrack_ecache.c:205 nf_conntrack_confirm include/net/netfilter/nf_conntrack_core.h:65 [inline] nf_confirm+0x3d8/0x4d0 net/netfilter/nf_conntrack_proto.c:154 ipv4_confirm+0x14c/0x240 net/netfilter/nf_conntrack_proto.c:169 nf_hook_entry_hookfn include/linux/netfilter.h:135 [inline] nf_hook_slow+0xbc/0x1e0 net/netfilter/core.c:512 nf_hook include/linux/netfilter.h:262 [inline] NF_HOOK_COND include/linux/netfilter.h:295 [inline] ip_output+0x40d/0x670 net/ipv4/ip_output.c:432 dst_output include/net/dst.h:436 [inline] ip_local_out+0xbb/0x1b0 net/ipv4/ip_output.c:125 ip_send_skb+0x42/0xf0 net/ipv4/ip_output.c:1559 udp_send_skb.isra.0+0x6d5/0x11b0 net/ipv4/udp.c:891 udp_sendmsg+0x1e8f/0x2810 net/ipv4/udp.c:1178 inet_sendmsg+0x9e/0xe0 net/ipv4/af_inet.c:807 sock_sendmsg_nosec net/socket.c:638 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:658 kernel_sendmsg+0x44/0x50 net/socket.c:678 rxrpc_send_data_packet+0x10cb/0x36b0 net/rxrpc/output.c:416 rxrpc_queue_packet net/rxrpc/sendmsg.c:220 [inline] rxrpc_send_data+0x1097/0x4130 net/rxrpc/sendmsg.c:427 rxrpc_do_sendmsg+0xb8e/0x1d5f net/rxrpc/sendmsg.c:736 rxrpc_sendmsg+0x4d6/0x5f0 net/rxrpc/af_rxrpc.c:585 sock_sendmsg_nosec net/socket.c:638 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:658 ___sys_sendmsg+0x3e2/0x920 net/socket.c:2312 __sys_sendmmsg+0x1bf/0x4d0 net/socket.c:2414 __do_sys_sendmmsg net/socket.c:2443 [inline] __se_sys_sendmmsg net/socket.c:2440 [inline] __x64_sys_sendmmsg+0x9d/0x100 net/socket.c:2440 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x441279 Code: e8 fc ab 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 9b 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fffcbb84fa8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441279 RDX: 0000000000000001 RSI: 0000000020005c00 RDI: 0000000000000003 RBP: 00000000000141b6 R08: 00000000004002c8 R09: 00000000004002c8 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004020a0 R13: 0000000000402130 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 8557: save_stack+0x23/0x90 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] __kasan_kmalloc mm/kasan/common.c:510 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:483 kasan_krealloc+0x84/0xc0 mm/kasan/common.c:565 __do_krealloc mm/slab_common.c:1655 [inline] krealloc+0xa6/0xd0 mm/slab_common.c:1710 nf_ct_ext_add+0x2c7/0x630 net/netfilter/nf_conntrack_extend.c:74 nf_ct_ecache_ext_add include/net/netfilter/nf_conntrack_ecache.h:55 [inline] init_conntrack.isra.0+0x5ed/0x11a0 net/netfilter/nf_conntrack_core.c:1470 resolve_normal_ct net/netfilter/nf_conntrack_core.c:1547 [inline] nf_conntrack_in+0xd94/0x1460 net/netfilter/nf_conntrack_core.c:1707 ipv4_conntrack_local+0x127/0x220 net/netfilter/nf_conntrack_proto.c:200 nf_hook_entry_hookfn include/linux/netfilter.h:135 [inline] nf_hook_slow+0xbc/0x1e0 net/netfilter/core.c:512 nf_hook include/linux/netfilter.h:262 [inline] __ip_local_out+0x403/0x870 net/ipv4/ip_output.c:114 ip_local_out+0x2d/0x1b0 net/ipv4/ip_output.c:123 ip_send_skb+0x42/0xf0 net/ipv4/ip_output.c:1559 udp_send_skb.isra.0+0x6d5/0x11b0 net/ipv4/udp.c:891 udp_sendmsg+0x1e8f/0x2810 net/ipv4/udp.c:1178 inet_sendmsg+0x9e/0xe0 net/ipv4/af_inet.c:807 sock_sendmsg_nosec net/socket.c:638 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:658 kernel_sendmsg+0x44/0x50 net/socket.c:678 rxrpc_send_data_packet+0x10cb/0x36b0 net/rxrpc/output.c:416 rxrpc_queue_packet net/rxrpc/sendmsg.c:220 [inline] rxrpc_send_data+0x1097/0x4130 net/rxrpc/sendmsg.c:427 rxrpc_do_sendmsg+0xb8e/0x1d5f net/rxrpc/sendmsg.c:736 rxrpc_sendmsg+0x4d6/0x5f0 net/rxrpc/af_rxrpc.c:585 sock_sendmsg_nosec net/socket.c:638 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:658 ___sys_sendmsg+0x3e2/0x920 net/socket.c:2312 __sys_sendmmsg+0x1bf/0x4d0 net/socket.c:2414 __do_sys_sendmmsg net/socket.c:2443 [inline] __se_sys_sendmmsg net/socket.c:2440 [inline] __x64_sys_sendmmsg+0x9d/0x100 net/socket.c:2440 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 8557: save_stack+0x23/0x90 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] kasan_set_free_info mm/kasan/common.c:332 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:471 kasan_slab_free+0xe/0x10 mm/kasan/common.c:480 __cache_free mm/slab.c:3426 [inline] kfree+0x10a/0x2c0 mm/slab.c:3757 nf_ct_ext_destroy+0x2ab/0x2e0 net/netfilter/nf_conntrack_extend.c:38 nf_conntrack_free+0x8f/0xe0 net/netfilter/nf_conntrack_core.c:1418 destroy_conntrack+0x1a2/0x270 net/netfilter/nf_conntrack_core.c:626 nf_conntrack_destroy+0xed/0x230 net/netfilter/core.c:600 nf_conntrack_put include/linux/netfilter/nf_conntrack_common.h:34 [inline] nf_conntrack_put include/linux/netfilter/nf_conntrack_common.h:31 [inline] nf_ct_resolve_clash net/netfilter/nf_conntrack_core.c:915 [inline] __nf_conntrack_confirm+0x21ca/0x2830 net/netfilter/nf_conntrack_core.c:1038 nf_conntrack_confirm include/net/netfilter/nf_conntrack_core.h:63 [inline] nf_confirm+0x3e7/0x4d0 net/netfilter/nf_conntrack_proto.c:154 ipv4_confirm+0x14c/0x240 net/netfilter/nf_conntrack_proto.c:169 nf_hook_entry_hookfn include/linux/netfilter.h:135 [inline] nf_hook_slow+0xbc/0x1e0 net/netfilter/core.c:512 nf_hook include/linux/netfilter.h:262 [inline] NF_HOOK_COND include/linux/netfilter.h:295 [inline] ip_output+0x40d/0x670 net/ipv4/ip_output.c:432 dst_output include/net/dst.h:436 [inline] ip_local_out+0xbb/0x1b0 net/ipv4/ip_output.c:125 ip_send_skb+0x42/0xf0 net/ipv4/ip_output.c:1559 udp_send_skb.isra.0+0x6d5/0x11b0 net/ipv4/udp.c:891 udp_sendmsg+0x1e8f/0x2810 net/ipv4/udp.c:1178 inet_sendmsg+0x9e/0xe0 net/ipv4/af_inet.c:807 sock_sendmsg_nosec net/socket.c:638 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:658 kernel_sendmsg+0x44/0x50 net/socket.c:678 rxrpc_send_data_packet+0x10cb/0x36b0 net/rxrpc/output.c:416 rxrpc_queue_packet net/rxrpc/sendmsg.c:220 [inline] rxrpc_send_data+0x1097/0x4130 net/rxrpc/sendmsg.c:427 rxrpc_do_sendmsg+0xb8e/0x1d5f net/rxrpc/sendmsg.c:736 rxrpc_sendmsg+0x4d6/0x5f0 net/rxrpc/af_rxrpc.c:585 sock_sendmsg_nosec net/socket.c:638 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:658 ___sys_sendmsg+0x3e2/0x920 net/socket.c:2312 __sys_sendmmsg+0x1bf/0x4d0 net/socket.c:2414 __do_sys_sendmmsg net/socket.c:2443 [inline] __se_sys_sendmmsg net/socket.c:2440 [inline] __x64_sys_sendmmsg+0x9d/0x100 net/socket.c:2440 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff88809b955200 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 4 bytes inside of 128-byte region [ffff88809b955200, ffff88809b955280) The buggy address belongs to the page: page:ffffea00026e5540 refcount:1 mapcount:0 mapping:ffff8880aa400700 index:0x0 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea0002867b48 ffffea0002a3df88 ffff8880aa400700 raw: 0000000000000000 ffff88809b955000 0000000100000010 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88809b955100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88809b955180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88809b955200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88809b955280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88809b955300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================