dccp_parse_options: DCCP(ffff8880281f1580): Option 32 (len=7) error=9 ================================================================== BUG: KASAN: use-after-free in dccp_ackvec_runlen net/dccp/ccids/../ackvec.h:43 [inline] BUG: KASAN: use-after-free in ccid2_hc_tx_packet_recv+0x22aa/0x2610 net/dccp/ccids/ccid2.c:592 Read of size 1 at addr ffff88807a40d494 by task syz-executor234/5300 CPU: 0 PID: 5300 Comm: syz-executor234 Not tainted 6.1.0-rc5-next-20221116-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:253 [inline] print_report+0x15e/0x45d mm/kasan/report.c:364 kasan_report+0xbf/0x1f0 mm/kasan/report.c:464 dccp_ackvec_runlen net/dccp/ccids/../ackvec.h:43 [inline] ccid2_hc_tx_packet_recv+0x22aa/0x2610 net/dccp/ccids/ccid2.c:592 ccid_hc_tx_packet_recv net/dccp/ccid.h:189 [inline] dccp_deliver_input_to_ccids+0x1eb/0x260 net/dccp/input.c:182 dccp_rcv_established net/dccp/input.c:374 [inline] dccp_rcv_established+0x10b/0x160 net/dccp/input.c:364 dccp_v4_do_rcv+0x168/0x1a0 net/dccp/ipv4.c:687 sk_backlog_rcv include/net/sock.h:1109 [inline] __release_sock+0x133/0x3b0 net/core/sock.c:2921 release_sock+0x58/0x1b0 net/core/sock.c:3477 dccp_sendmsg+0x6d0/0xd30 net/dccp/proto.c:791 inet_sendmsg+0x9d/0xe0 net/ipv4/af_inet.c:827 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xd3/0x120 net/socket.c:734 ____sys_sendmsg+0x334/0x8c0 net/socket.c:2476 ___sys_sendmsg+0x110/0x1b0 net/socket.c:2530 __sys_sendmmsg+0x1b7/0x540 net/socket.c:2616 __do_sys_sendmmsg net/socket.c:2645 [inline] __se_sys_sendmmsg net/socket.c:2642 [inline] __x64_sys_sendmmsg+0x9d/0x100 net/socket.c:2642 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fbbefbd3d19 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 41 15 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 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff08c18228 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007fbbefbd3d19 RDX: 04000000000001e6 RSI: 0000000020000c00 RDI: 0000000000000005 RBP: 00007fff08c18290 R08: 0000000000000001 R09: 00007fff08c18257 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000006 R13: 00007fbbefc4f4a0 R14: 00007fff08c182b0 R15: 00007fff08c1827a Allocated by task 5300: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:376 [inline] ____kasan_kmalloc mm/kasan/common.c:335 [inline] __kasan_kmalloc+0xa5/0xb0 mm/kasan/common.c:385 kasan_kmalloc include/linux/kasan.h:212 [inline] __do_kmalloc_node mm/slab_common.c:955 [inline] __kmalloc_node_track_caller+0x5b/0xc0 mm/slab_common.c:975 kmalloc_reserve net/core/skbuff.c:438 [inline] __alloc_skb+0xe9/0x310 net/core/skbuff.c:511 alloc_skb include/linux/skbuff.h:1269 [inline] dccp_send_ack.part.0+0x75/0x2f0 net/dccp/output.c:585 dccp_send_ack+0x57/0x70 net/dccp/output.c:584 ccid2_hc_rx_packet_recv+0x134/0x1b0 net/dccp/ccids/ccid2.c:771 ccid_hc_rx_packet_recv net/dccp/ccid.h:182 [inline] dccp_deliver_input_to_ccids+0xe1/0x260 net/dccp/input.c:176 dccp_rcv_established net/dccp/input.c:374 [inline] dccp_rcv_established+0x10b/0x160 net/dccp/input.c:364 dccp_v4_do_rcv+0x168/0x1a0 net/dccp/ipv4.c:687 sk_backlog_rcv include/net/sock.h:1109 [inline] __sk_receive_skb+0x298/0x820 net/core/sock.c:565 dccp_v4_rcv+0xfbf/0x18e0 net/dccp/ipv4.c:910 ip_protocol_deliver_rcu+0x9f/0x7c0 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x2ec/0x4c0 net/ipv4/ip_input.c:233 NF_HOOK include/linux/netfilter.h:302 [inline] NF_HOOK include/linux/netfilter.h:296 [inline] ip_local_deliver+0x1ae/0x200 net/ipv4/ip_input.c:254 dst_input include/net/dst.h:455 [inline] ip_rcv_finish+0x1cf/0x2f0 net/ipv4/ip_input.c:449 NF_HOOK include/linux/netfilter.h:302 [inline] NF_HOOK include/linux/netfilter.h:296 [inline] ip_rcv+0xae/0xd0 net/ipv4/ip_input.c:569 __netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:5488 __netif_receive_skb+0x1f/0x1c0 net/core/dev.c:5602 process_backlog+0x3e4/0x810 net/core/dev.c:5930 __napi_poll+0xb8/0x770 net/core/dev.c:6497 napi_poll net/core/dev.c:6564 [inline] net_rx_action+0xa00/0xde0 net/core/dev.c:6675 __do_softirq+0x1fb/0xadc kernel/softirq.c:571 Freed by task 5300: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2e/0x40 mm/kasan/generic.c:518 ____kasan_slab_free mm/kasan/common.c:241 [inline] ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:205 kasan_slab_free include/linux/kasan.h:178 [inline] slab_free_hook mm/slub.c:1763 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1789 slab_free mm/slub.c:3696 [inline] __kmem_cache_free+0xaf/0x3b0 mm/slub.c:3709 skb_free_head+0xac/0x110 net/core/skbuff.c:768 skb_release_data+0x5e8/0x7f0 net/core/skbuff.c:797 skb_release_all net/core/skbuff.c:862 [inline] __kfree_skb net/core/skbuff.c:876 [inline] kfree_skb_reason+0x1ab/0x4f0 net/core/skbuff.c:902 kfree_skb include/linux/skbuff.h:1218 [inline] dccp_v4_do_rcv+0x142/0x1a0 net/dccp/ipv4.c:722 sk_backlog_rcv include/net/sock.h:1109 [inline] __release_sock+0x133/0x3b0 net/core/sock.c:2921 release_sock+0x58/0x1b0 net/core/sock.c:3477 dccp_sendmsg+0x6d0/0xd30 net/dccp/proto.c:791 inet_sendmsg+0x9d/0xe0 net/ipv4/af_inet.c:827 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xd3/0x120 net/socket.c:734 ____sys_sendmsg+0x334/0x8c0 net/socket.c:2476 ___sys_sendmsg+0x110/0x1b0 net/socket.c:2530 __sys_sendmmsg+0x1b7/0x540 net/socket.c:2616 __do_sys_sendmmsg net/socket.c:2645 [inline] __se_sys_sendmmsg net/socket.c:2642 [inline] __x64_sys_sendmmsg+0x9d/0x100 net/socket.c:2642 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff88807a40d000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1172 bytes inside of 2048-byte region [ffff88807a40d000, ffff88807a40d800) The buggy address belongs to the physical page: page:ffffea0001e90200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7a408 head:ffffea0001e90200 order:3 compound_mapcount:0 subpages_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffff888012442000 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5300, tgid 5300 (syz-executor234), ts 72299133275, free_ts 34874514007 prep_new_page mm/page_alloc.c:2561 [inline] get_page_from_freelist+0x10b5/0x2d50 mm/page_alloc.c:4310 __alloc_pages+0x1cb/0x5b0 mm/page_alloc.c:5569 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2285 alloc_slab_page mm/slub.c:1833 [inline] allocate_slab+0x25e/0x350 mm/slub.c:1980 new_slab mm/slub.c:2033 [inline] ___slab_alloc+0xa91/0x1400 mm/slub.c:3211 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3310 slab_alloc_node mm/slub.c:3395 [inline] __kmem_cache_alloc_node+0x1a9/0x430 mm/slub.c:3472 __do_kmalloc_node mm/slab_common.c:954 [inline] __kmalloc_node_track_caller+0x4b/0xc0 mm/slab_common.c:975 kmalloc_reserve net/core/skbuff.c:438 [inline] __alloc_skb+0xe9/0x310 net/core/skbuff.c:511 alloc_skb include/linux/skbuff.h:1269 [inline] alloc_skb_with_frags+0x97/0x6c0 net/core/skbuff.c:6139 sock_alloc_send_pskb+0x7a7/0x930 net/core/sock.c:2734 sock_alloc_send_skb include/net/sock.h:1884 [inline] dccp_sendmsg+0x2e9/0xd30 net/dccp/proto.c:758 inet_sendmsg+0x9d/0xe0 net/ipv4/af_inet.c:827 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xd3/0x120 net/socket.c:734 ____sys_sendmsg+0x334/0x8c0 net/socket.c:2476 ___sys_sendmsg+0x110/0x1b0 net/socket.c:2530 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1468 [inline] free_pcp_prepare+0x65c/0xc00 mm/page_alloc.c:1518 free_unref_page_prepare mm/page_alloc.c:3409 [inline] free_unref_page+0x1d/0x4d0 mm/page_alloc.c:3505 __unfreeze_partials+0x17c/0x1a0 mm/slub.c:2617 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x192/0x220 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x66/0x90 mm/kasan/common.c:307 kasan_slab_alloc include/linux/kasan.h:202 [inline] slab_post_alloc_hook mm/slab.h:761 [inline] slab_alloc_node mm/slub.c:3433 [inline] slab_alloc mm/slub.c:3441 [inline] __kmem_cache_alloc_lru mm/slub.c:3448 [inline] kmem_cache_alloc_lru+0x26c/0x760 mm/slub.c:3464 __d_alloc+0x32/0x980 fs/dcache.c:1769 d_alloc_anon fs/dcache.c:1868 [inline] d_alloc_cursor+0x3f/0xe0 fs/dcache.c:1874 dcache_dir_open+0x37/0x90 fs/libfs.c:83 do_dentry_open+0x6cc/0x13f0 fs/open.c:882 do_open fs/namei.c:3557 [inline] path_openat+0x1bbc/0x2a50 fs/namei.c:3713 do_filp_open+0x1ba/0x410 fs/namei.c:3740 do_sys_openat2+0x16d/0x4c0 fs/open.c:1310 do_sys_open fs/open.c:1326 [inline] __do_sys_openat fs/open.c:1342 [inline] __se_sys_openat fs/open.c:1337 [inline] __x64_sys_openat+0x143/0x1f0 fs/open.c:1337 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 Memory state around the buggy address: ffff88807a40d380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807a40d400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88807a40d480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807a40d500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807a40d580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================