R13: 000000000000000b R14: 00007f28ddd9bf80 R15: 00007ffc6b911898 dccp_parse_options: DCCP(ffff8880299b1580): Option 32 (len=7) error=9 ================================================================== BUG: KASAN: slab-use-after-free in dccp_ackvec_runlen net/dccp/ccids/../ackvec.h:43 [inline] BUG: KASAN: slab-use-after-free in ccid2_hc_tx_packet_recv+0x18fe/0x2070 net/dccp/ccids/ccid2.c:592 Read of size 1 at addr ffff88802daa6494 by task syz-executor.0/5469 CPU: 1 PID: 5469 Comm: syz-executor.0 Not tainted 6.8.0-rc2-syzkaller-00031-g861c0981648f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:377 [inline] print_report+0x163/0x540 mm/kasan/report.c:488 kasan_report+0x142/0x170 mm/kasan/report.c:601 dccp_ackvec_runlen net/dccp/ccids/../ackvec.h:43 [inline] ccid2_hc_tx_packet_recv+0x18fe/0x2070 net/dccp/ccids/ccid2.c:592 ccid_hc_tx_packet_recv net/dccp/ccid.h:189 [inline] dccp_deliver_input_to_ccids net/dccp/input.c:182 [inline] dccp_rcv_established+0x28b/0x310 net/dccp/input.c:374 dccp_v4_do_rcv+0xff/0x1f0 net/dccp/ipv4.c:675 sk_backlog_rcv include/net/sock.h:1092 [inline] __release_sock+0x19c/0x4c0 net/core/sock.c:2973 release_sock+0x61/0x1d0 net/core/sock.c:3539 dccp_sendmsg+0x4de/0xb70 net/dccp/proto.c:803 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] ____sys_sendmsg+0x592/0x890 net/socket.c:2584 ___sys_sendmsg net/socket.c:2638 [inline] __sys_sendmmsg+0x3b2/0x730 net/socket.c:2724 __do_sys_sendmmsg net/socket.c:2753 [inline] __se_sys_sendmmsg net/socket.c:2750 [inline] __x64_sys_sendmmsg+0xa0/0xb0 net/socket.c:2750 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7f28ddc7c859 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 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 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f28deac60c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007f28ddd9bf80 RCX: 00007f28ddc7c859 RDX: 04000000000001e6 RSI: 0000000020000c00 RDI: 0000000000000005 RBP: 00007f28deac6120 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 000000000000000b R14: 00007f28ddd9bf80 R15: 00007ffc6b911898 Allocated by task 5469: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x70 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:372 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:389 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slub.c:3981 [inline] __kmalloc_node_track_caller+0x249/0x4e0 mm/slub.c:4001 kmalloc_reserve+0xf3/0x260 net/core/skbuff.c:582 __alloc_skb+0x1b1/0x420 net/core/skbuff.c:651 alloc_skb include/linux/skbuff.h:1296 [inline] dccp_send_ack+0xa6/0x310 net/dccp/output.c:585 ccid2_hc_rx_packet_recv+0x10c/0x1b0 net/dccp/ccids/ccid2.c:771 ccid_hc_rx_packet_recv net/dccp/ccid.h:182 [inline] dccp_deliver_input_to_ccids net/dccp/input.c:176 [inline] dccp_rcv_established+0x1b7/0x310 net/dccp/input.c:374 dccp_v4_do_rcv+0xff/0x1f0 net/dccp/ipv4.c:675 sk_backlog_rcv include/net/sock.h:1092 [inline] __sk_receive_skb+0x41e/0x9d0 net/core/sock.c:568 ip_protocol_deliver_rcu+0x208/0x3f0 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x2b6/0x500 net/ipv4/ip_input.c:233 NF_HOOK+0x3a1/0x450 include/linux/netfilter.h:314 NF_HOOK+0x3a1/0x450 include/linux/netfilter.h:314 __netif_receive_skb_one_core net/core/dev.c:5534 [inline] __netif_receive_skb+0x1ca/0x530 net/core/dev.c:5648 process_backlog+0x385/0x760 net/core/dev.c:5976 __napi_poll+0xc7/0x480 net/core/dev.c:6576 napi_poll net/core/dev.c:6645 [inline] net_rx_action+0x78b/0x1010 net/core/dev.c:6778 __do_softirq+0x2b8/0x939 kernel/softirq.c:553 Freed by task 5469: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x70 mm/kasan/common.c:68 kasan_save_free_info+0x4e/0x60 mm/kasan/generic.c:640 poison_slab_object+0xa6/0xe0 mm/kasan/common.c:241 __kasan_slab_free+0x34/0x60 mm/kasan/common.c:257 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2121 [inline] slab_free mm/slub.c:4299 [inline] kfree+0x14a/0x380 mm/slub.c:4409 skb_kfree_head net/core/skbuff.c:986 [inline] skb_free_head net/core/skbuff.c:998 [inline] skb_release_data+0x660/0x850 net/core/skbuff.c:1028 skb_release_all net/core/skbuff.c:1094 [inline] __kfree_skb net/core/skbuff.c:1108 [inline] kfree_skb_reason+0x195/0x390 net/core/skbuff.c:1144 kfree_skb include/linux/skbuff.h:1244 [inline] dccp_v4_do_rcv+0x143/0x1f0 net/dccp/ipv4.c:710 sk_backlog_rcv include/net/sock.h:1092 [inline] __release_sock+0x19c/0x4c0 net/core/sock.c:2973 release_sock+0x61/0x1d0 net/core/sock.c:3539 dccp_sendmsg+0x4de/0xb70 net/dccp/proto.c:803 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] ____sys_sendmsg+0x592/0x890 net/socket.c:2584 ___sys_sendmsg net/socket.c:2638 [inline] __sys_sendmmsg+0x3b2/0x730 net/socket.c:2724 __do_sys_sendmmsg net/socket.c:2753 [inline] __se_sys_sendmmsg net/socket.c:2750 [inline] __x64_sys_sendmmsg+0xa0/0xb0 net/socket.c:2750 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b The buggy address belongs to the object at ffff88802daa6000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1172 bytes inside of freed 2048-byte region [ffff88802daa6000, ffff88802daa6800) The buggy address belongs to the physical page: page:ffffea0000b6a800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2daa0 head:ffffea0000b6a800 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000840 ffff888013042000 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 4838, tgid 4838 (kworker/0:3), ts 88729761992, free_ts 88669368141 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1e6/0x210 mm/page_alloc.c:1533 prep_new_page mm/page_alloc.c:1540 [inline] get_page_from_freelist+0x33ea/0x3570 mm/page_alloc.c:3311 __alloc_pages+0x255/0x680 mm/page_alloc.c:4567 __alloc_pages_node include/linux/gfp.h:238 [inline] alloc_pages_node include/linux/gfp.h:261 [inline] alloc_slab_page+0x5f/0x160 mm/slub.c:2190 allocate_slab mm/slub.c:2354 [inline] new_slab+0x84/0x2f0 mm/slub.c:2407 ___slab_alloc+0xd17/0x13d0 mm/slub.c:3540 __slab_alloc mm/slub.c:3625 [inline] __slab_alloc_node mm/slub.c:3678 [inline] slab_alloc_node mm/slub.c:3850 [inline] __do_kmalloc_node mm/slub.c:3980 [inline] __kmalloc_node_track_caller+0x2cd/0x4e0 mm/slub.c:4001 kmalloc_reserve+0xf3/0x260 net/core/skbuff.c:582 __alloc_skb+0x1b1/0x420 net/core/skbuff.c:651 alloc_skb include/linux/skbuff.h:1296 [inline] alloc_skb_with_frags+0xc3/0x780 net/core/skbuff.c:6394 sock_alloc_send_pskb+0x919/0xa50 net/core/sock.c:2784 sock_alloc_send_skb include/net/sock.h:1855 [inline] mld_newpack+0x1c3/0xa90 net/ipv6/mcast.c:1746 add_grhead net/ipv6/mcast.c:1849 [inline] add_grec+0x148e/0x19a0 net/ipv6/mcast.c:1987 mld_send_cr net/ipv6/mcast.c:2113 [inline] mld_ifc_work+0x6bf/0xb20 net/ipv6/mcast.c:2650 process_one_work kernel/workqueue.c:2633 [inline] process_scheduled_works+0x90f/0x1420 kernel/workqueue.c:2706 worker_thread+0xa5f/0x1000 kernel/workqueue.c:2787 page last free pid 5466 tgid 5466 stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1140 [inline] free_unref_page_prepare+0x959/0xa80 mm/page_alloc.c:2346 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2486 discard_slab mm/slub.c:2453 [inline] __put_partials+0xeb/0x130 mm/slub.c:2922 put_cpu_partial+0x17b/0x250 mm/slub.c:2997 __slab_free+0x2fe/0x410 mm/slub.c:4166 qlink_free mm/kasan/quarantine.c:160 [inline] qlist_free_all+0x6d/0xd0 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x14b/0x160 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x23/0x70 mm/kasan/common.c:324 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3813 [inline] slab_alloc_node mm/slub.c:3860 [inline] kmem_cache_alloc+0x16f/0x340 mm/slub.c:3867 vm_area_alloc+0x24/0x1d0 kernel/fork.c:465 mmap_region+0xbd8/0x1f90 mm/mmap.c:2806 do_mmap+0x7ae/0xe60 mm/mmap.c:1379 vm_mmap_pgoff+0x1e2/0x420 mm/util.c:556 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b Memory state around the buggy address: ffff88802daa6380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802daa6400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88802daa6480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802daa6500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802daa6580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================