R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 000000000000000b R14: 00007f41c619bf80 R15: 00007fffe3d307c8 dccp_parse_options: DCCP(ffff888026989580): 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+0x1902/0x2070 net/dccp/ccids/ccid2.c:592 Read of size 1 at addr ffff88802e6a2494 by task syz-executor.0/5511 CPU: 0 PID: 5511 Comm: syz-executor.0 Not tainted 6.9.0-rc4-next-20240416-syzkaller-06520-g66e4190e92ce #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 dccp_ackvec_runlen net/dccp/ccids/../ackvec.h:43 [inline] ccid2_hc_tx_packet_recv+0x1902/0x2070 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+0x295/0x320 net/dccp/input.c:374 dccp_v4_do_rcv+0xff/0x1f0 net/dccp/ipv4.c:675 sk_backlog_rcv include/net/sock.h:1106 [inline] __release_sock+0x243/0x350 net/core/sock.c:2983 release_sock+0x61/0x1f0 net/core/sock.c:3549 dccp_sendmsg+0x4ee/0xba0 net/dccp/proto.c:803 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x1a6/0x270 net/socket.c:745 ____sys_sendmsg+0x525/0x7d0 net/socket.c:2584 ___sys_sendmsg net/socket.c:2638 [inline] __sys_sendmmsg+0x3b2/0x740 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+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f41c607bdb9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f41c6d230c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007f41c619bf80 RCX: 00007f41c607bdb9 RDX: 04000000000001e6 RSI: 0000000020000c00 RDI: 0000000000000005 RBP: 00007f41c6d23120 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 000000000000000b R14: 00007f41c619bf80 R15: 00007fffe3d307c8 Allocated by task 5511: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slub.c:4078 [inline] kmalloc_node_track_caller_noprof+0x22a/0x440 mm/slub.c:4098 kmalloc_reserve+0x111/0x2a0 net/core/skbuff.c:600 __alloc_skb+0x1f3/0x440 net/core/skbuff.c:669 alloc_skb include/linux/skbuff.h:1313 [inline] dccp_send_ack+0xaa/0x310 net/dccp/output.c:585 ccid2_hc_rx_packet_recv+0x10c/0x1c0 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+0x1bb/0x320 net/dccp/input.c:374 dccp_v4_do_rcv+0xff/0x1f0 net/dccp/ipv4.c:675 sk_backlog_rcv include/net/sock.h:1106 [inline] __sk_receive_skb+0x823/0x8a0 net/core/sock.c:569 ip_protocol_deliver_rcu+0x2e0/0x430 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x33f/0x5f0 net/ipv4/ip_input.c:233 NF_HOOK+0x3a4/0x450 include/linux/netfilter.h:314 NF_HOOK+0x3a4/0x450 include/linux/netfilter.h:314 __netif_receive_skb_one_core net/core/dev.c:5605 [inline] __netif_receive_skb+0x2bf/0x650 net/core/dev.c:5719 process_backlog+0x391/0x7d0 net/core/dev.c:6048 __napi_poll+0xcb/0x490 net/core/dev.c:6702 napi_poll net/core/dev.c:6771 [inline] net_rx_action+0x7bb/0x10a0 net/core/dev.c:6887 __do_softirq+0x2c6/0x980 kernel/softirq.c:554 Freed by task 5511: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579 poison_slab_object+0xe0/0x150 mm/kasan/common.c:240 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2190 [inline] slab_free mm/slub.c:4393 [inline] kfree+0x149/0x350 mm/slub.c:4514 skb_kfree_head net/core/skbuff.c:1036 [inline] skb_free_head net/core/skbuff.c:1048 [inline] skb_release_data+0x690/0x890 net/core/skbuff.c:1075 skb_release_all net/core/skbuff.c:1140 [inline] __kfree_skb net/core/skbuff.c:1154 [inline] kfree_skb_reason+0x1a3/0x3b0 net/core/skbuff.c:1190 kfree_skb include/linux/skbuff.h:1262 [inline] dccp_v4_do_rcv+0x143/0x1f0 net/dccp/ipv4.c:710 sk_backlog_rcv include/net/sock.h:1106 [inline] __release_sock+0x243/0x350 net/core/sock.c:2983 release_sock+0x61/0x1f0 net/core/sock.c:3549 dccp_sendmsg+0x4ee/0xba0 net/dccp/proto.c:803 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x1a6/0x270 net/socket.c:745 ____sys_sendmsg+0x525/0x7d0 net/socket.c:2584 ___sys_sendmsg net/socket.c:2638 [inline] __sys_sendmmsg+0x3b2/0x740 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+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88802e6a2000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1172 bytes inside of freed 2048-byte region [ffff88802e6a2000, ffff88802e6a2800) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2e6a0 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff80000000040(head|node=0|zone=1|lastcpupid=0xfff) page_type: 0xffffefff(slab) raw: 00fff80000000040 ffff888015042000 ffffea0000b98200 dead000000000002 raw: 0000000000000000 0000000000080008 00000001ffffefff 0000000000000000 head: 00fff80000000040 ffff888015042000 ffffea0000b98200 dead000000000002 head: 0000000000000000 0000000000080008 00000001ffffefff 0000000000000000 head: 00fff80000000003 ffffea0000b9a801 ffffffffffffffff 0000000000000000 head: 0000000000000008 0000000000000000 00000000ffffffff 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 0x1d28c0(GFP_NOWAIT|__GFP_IO|__GFP_FS|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 1032, tgid 1797468944 (kworker/u8:5), ts 1032, free_ts 61884747530 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1476 prep_new_page mm/page_alloc.c:1484 [inline] get_page_from_freelist+0x2ce2/0x2d90 mm/page_alloc.c:3446 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4704 __alloc_pages_node_noprof include/linux/gfp.h:244 [inline] alloc_pages_node_noprof include/linux/gfp.h:271 [inline] alloc_slab_page+0x5f/0x120 mm/slub.c:2259 allocate_slab+0x5a/0x2e0 mm/slub.c:2422 new_slab mm/slub.c:2475 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3624 __slab_alloc+0x58/0xa0 mm/slub.c:3714 __slab_alloc_node mm/slub.c:3767 [inline] slab_alloc_node mm/slub.c:3945 [inline] __do_kmalloc_node mm/slub.c:4077 [inline] kmalloc_node_track_caller_noprof+0x286/0x440 mm/slub.c:4098 kmalloc_reserve+0x111/0x2a0 net/core/skbuff.c:600 pskb_expand_head+0x1f0/0x13d0 net/core/skbuff.c:2189 netlink_trim+0x183/0x220 net/netlink/af_netlink.c:1317 netlink_broadcast_filtered+0x76/0x1290 net/netlink/af_netlink.c:1523 nlmsg_multicast_filtered include/net/netlink.h:1125 [inline] nlmsg_multicast include/net/netlink.h:1144 [inline] nlmsg_notify+0xfb/0x1c0 net/netlink/af_netlink.c:2602 rtnl_notify net/core/rtnetlink.c:757 [inline] rtmsg_ifinfo_send net/core/rtnetlink.c:4078 [inline] rtmsg_ifinfo_event net/core/rtnetlink.c:4094 [inline] rtnetlink_event+0x21d/0x260 net/core/rtnetlink.c:6645 notifier_call_chain+0x19f/0x3e0 kernel/notifier.c:93 __netdev_upper_dev_unlink+0x2ba/0x8e0 net/core/dev.c:7964 page last free pid 5172 tgid 5172 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1096 [inline] free_unref_page+0xd22/0xea0 mm/page_alloc.c:2609 discard_slab mm/slub.c:2521 [inline] __put_partials+0xeb/0x130 mm/slub.c:2989 put_cpu_partial+0x17c/0x250 mm/slub.c:3064 __slab_free+0x2ea/0x3d0 mm/slub.c:4263 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9e/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:322 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3897 [inline] slab_alloc_node mm/slub.c:3957 [inline] kmem_cache_alloc_noprof+0x135/0x290 mm/slub.c:3964 vm_area_alloc+0x24/0x1d0 kernel/fork.c:467 mmap_region+0xc47/0x2060 mm/mmap.c:2873 do_mmap+0x8ad/0xfa0 mm/mmap.c:1397 vm_mmap_pgoff+0x1dd/0x3d0 mm/util.c:573 ksys_mmap_pgoff+0x4f1/0x720 mm/mmap.c:1443 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff88802e6a2380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802e6a2400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88802e6a2480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802e6a2500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802e6a2580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================