================================================================== BUG: KASAN: use-after-free in ccid_hc_tx_delete+0xde/0x100 net/dccp/ccid.c:188 Read of size 8 at addr ffff88805da03140 by task syz-executor.3/7608 CPU: 0 PID: 7608 Comm: syz-executor.3 Not tainted 5.0.0+ #14 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.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:132 ccid_hc_tx_delete+0xde/0x100 net/dccp/ccid.c:188 dccp_sk_destruct+0x3f/0x90 net/dccp/proto.c:181 __sk_destruct+0x55/0x6d0 net/core/sock.c:1699 __rcu_reclaim kernel/rcu/rcu.h:227 [inline] rcu_do_batch kernel/rcu/tree.c:2475 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2788 [inline] rcu_core+0x928/0x1390 kernel/rcu/tree.c:2769 __do_softirq+0x266/0x95a kernel/softirq.c:293 invoke_softirq kernel/softirq.c:374 [inline] irq_exit+0x180/0x1d0 kernel/softirq.c:414 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x14a/0x570 arch/x86/kernel/apic/apic.c:1062 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807 RIP: 0010:unwind_get_return_address+0x83/0xa0 arch/x86/kernel/unwind_frame.c:19 Code: 8b 7b 48 e8 4f e8 1a 00 85 c0 74 d1 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 80 3c 02 00 75 1a 48 8b 43 48 5b 41 5c <5d> c3 e8 a6 ad 77 00 eb a4 4c 89 e7 e8 bc ad 77 00 eb c2 4c 89 e7 RSP: 0018:ffff888093af7908 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: ffffffff81a831cf RBX: ffff888093af79b8 RCX: 0000000000000000 RDX: 1ffff1101275ef2c RSI: 1ffff1101275ef00 RDI: ffffffff81a831cf RBP: ffff888093af7908 R08: 0000000000000001 R09: ffff888093af7968 R10: ffff888093af7940 R11: ffff888093af7950 R12: 0000000000000000 R13: 0000000000000000 R14: ffff88809987e280 R15: ffff88808f5523c0 __save_stack_trace+0x8a/0xf0 arch/x86/kernel/stacktrace.c:45 save_stack_trace+0x1a/0x20 arch/x86/kernel/stacktrace.c:60 save_stack+0x45/0xd0 mm/kasan/common.c:75 set_track mm/kasan/common.c:87 [inline] __kasan_kmalloc mm/kasan/common.c:497 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:470 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:505 slab_post_alloc_hook mm/slab.h:436 [inline] slab_alloc mm/slab.c:3392 [inline] kmem_cache_alloc+0x11a/0x6f0 mm/slab.c:3554 shmem_alloc_inode+0x1c/0x50 mm/shmem.c:3632 alloc_inode+0x66/0x190 fs/inode.c:210 new_inode_pseudo+0x19/0xf0 fs/inode.c:903 new_inode+0x1f/0x40 fs/inode.c:932 shmem_get_inode+0x84/0x780 mm/shmem.c:2231 shmem_mknod+0x5a/0x1f0 mm/shmem.c:2866 shmem_mkdir+0x29/0x60 mm/shmem.c:2917 vfs_mkdir+0x433/0x690 fs/namei.c:3814 do_mkdirat+0x234/0x2a0 fs/namei.c:3837 __do_sys_mkdir fs/namei.c:3853 [inline] __se_sys_mkdir fs/namei.c:3851 [inline] __ia32_sys_mkdir+0x5a/0x80 fs/namei.c:3851 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline] do_fast_syscall_32+0x281/0xc98 arch/x86/entry/common.c:397 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 RIP: 0023:0xf7fac869 Code: 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 14 24 c3 8b 3c 24 c3 90 90 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:000000000845fd7c EFLAGS: 00000202 ORIG_RAX: 0000000000000027 RAX: ffffffffffffffda RBX: 000000000845fde0 RCX: 00000000000001ff RDX: 000000000000000a RSI: 00000000000fe009 RDI: 000000000845fde0 RBP: 000000000000000a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 3440: save_stack+0x45/0xd0 mm/kasan/common.c:75 set_track mm/kasan/common.c:87 [inline] __kasan_kmalloc mm/kasan/common.c:497 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:470 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:505 slab_post_alloc_hook mm/slab.h:436 [inline] slab_alloc mm/slab.c:3392 [inline] kmem_cache_alloc+0x11a/0x6f0 mm/slab.c:3554 ccid_new+0x256/0x3f0 net/dccp/ccid.c:151 dccp_hdlr_ccid+0x27/0x150 net/dccp/feat.c:44 __dccp_feat_activate+0x17a/0x270 net/dccp/feat.c:344 dccp_feat_activate_values+0x33a/0x766 net/dccp/feat.c:1538 dccp_rcv_request_sent_state_process net/dccp/input.c:472 [inline] dccp_rcv_state_process+0x116f/0x1935 net/dccp/input.c:680 dccp_v4_do_rcv+0x100/0x190 net/dccp/ipv4.c:688 sk_backlog_rcv include/net/sock.h:937 [inline] __release_sock+0x12e/0x3a0 net/core/sock.c:2413 release_sock+0x59/0x1c0 net/core/sock.c:2929 inet_wait_for_connect net/ipv4/af_inet.c:588 [inline] __inet_stream_connect+0x59f/0xea0 net/ipv4/af_inet.c:680 inet_stream_connect+0x58/0xa0 net/ipv4/af_inet.c:719 __sys_connect+0x266/0x330 net/socket.c:1685 __do_sys_connect net/socket.c:1696 [inline] __se_sys_connect net/socket.c:1693 [inline] __ia32_sys_connect+0x72/0xb0 net/socket.c:1693 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline] do_fast_syscall_32+0x281/0xc98 arch/x86/entry/common.c:397 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 Freed by task 3440: save_stack+0x45/0xd0 mm/kasan/common.c:75 set_track mm/kasan/common.c:87 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:459 kasan_slab_free+0xe/0x10 mm/kasan/common.c:467 __cache_free mm/slab.c:3498 [inline] kmem_cache_free+0x86/0x260 mm/slab.c:3764 ccid_hc_tx_delete+0xc1/0x100 net/dccp/ccid.c:190 dccp_hdlr_ccid+0x7d/0x150 net/dccp/feat.c:53 __dccp_feat_activate+0x17a/0x270 net/dccp/feat.c:344 dccp_feat_activate_values+0x33a/0x766 net/dccp/feat.c:1538 dccp_create_openreq_child+0x40c/0x570 net/dccp/minisocks.c:127 dccp_v4_request_recv_sock+0xbc/0xb80 net/dccp/ipv4.c:411 dccp_v6_request_recv_sock+0x10e7/0x1da0 net/dccp/ipv6.c:418 dccp_check_req+0x35c/0x6f0 net/dccp/minisocks.c:196 dccp_v4_rcv+0x69c/0x1bf1 net/dccp/ipv4.c:846 ip_protocol_deliver_rcu+0x60/0x8f0 net/ipv4/ip_input.c:208 ip_local_deliver_finish+0x23b/0x390 net/ipv4/ip_input.c:234 NF_HOOK include/linux/netfilter.h:289 [inline] NF_HOOK include/linux/netfilter.h:283 [inline] ip_local_deliver+0x1e9/0x520 net/ipv4/ip_input.c:255 dst_input include/net/dst.h:450 [inline] ip_rcv_finish+0x1e1/0x300 net/ipv4/ip_input.c:414 NF_HOOK include/linux/netfilter.h:289 [inline] NF_HOOK include/linux/netfilter.h:283 [inline] ip_rcv+0xe8/0x3f0 net/ipv4/ip_input.c:524 __netif_receive_skb_one_core+0x115/0x1a0 net/core/dev.c:4973 __netif_receive_skb+0x2c/0x1c0 net/core/dev.c:5083 process_backlog+0x206/0x750 net/core/dev.c:5923 napi_poll net/core/dev.c:6346 [inline] net_rx_action+0x4fa/0x1070 net/core/dev.c:6412 __do_softirq+0x266/0x95a kernel/softirq.c:293 The buggy address belongs to the object at ffff88805da03140 which belongs to the cache ccid2_hc_tx_sock of size 1240 The buggy address is located 0 bytes inside of 1240-byte region [ffff88805da03140, ffff88805da03618) The buggy address belongs to the page: page:ffffea0001768080 count:1 mapcount:0 mapping:ffff8882166e2900 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea0001659088 ffffea000255ff08 ffff8882166e2900 raw: 0000000000000000 ffff88805da020c0 0000000100000005 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88805da03000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805da03080: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88805da03100: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ^ ffff88805da03180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805da03200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================