syzbot

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BUG: KASAN: use-after-free in memset include/linux/fortify-string.h:209 [inline]
BUG: KASAN: use-after-free in tcp_cdg_cwnd_event+0x189/0x300 net/ipv4/tcp_cdg.c:355
Write of size 64 at addr ffff88804a934900 by task kworker/1:10/9742

CPU: 1 PID: 9742 Comm: kworker/1:10 Not tainted 5.16.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events mptcp_worker
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 print_address_description.constprop.0.cold+0x8d/0x320 mm/kasan/report.c:247
 __kasan_report mm/kasan/report.c:433 [inline]
 kasan_report.cold+0x83/0xdf mm/kasan/report.c:450
 check_region_inline mm/kasan/generic.c:183 [inline]
 kasan_check_range+0x13d/0x180 mm/kasan/generic.c:189
 memset+0x20/0x40 mm/kasan/shadow.c:44
 memset include/linux/fortify-string.h:209 [inline]
 tcp_cdg_cwnd_event+0x189/0x300 net/ipv4/tcp_cdg.c:355
 tcp_ca_event include/net/tcp.h:1156 [inline]
 tcp_cwnd_restart+0x108/0x4a0 net/ipv4/tcp_output.c:147
 tcp_slow_start_after_idle_check include/net/tcp.h:1405 [inline]
 tcp_skb_entail+0x5c2/0x710 net/ipv4/tcp.c:666
 __mptcp_alloc_tx_skb net/mptcp/protocol.c:1197 [inline]
 mptcp_alloc_tx_skb net/mptcp/protocol.c:1214 [inline]
 mptcp_sendmsg_frag+0x5ca/0x2190 net/mptcp/protocol.c:1279
 __mptcp_push_pending+0x232/0x720 net/mptcp/protocol.c:1545
 mptcp_release_cb+0xfe/0x200 net/mptcp/protocol.c:2975
 release_sock+0xb4/0x1b0 net/core/sock.c:3312
 mptcp_worker+0x51e/0xc20 net/mptcp/protocol.c:2443
 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2445
 kthread+0x405/0x4f0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>

Allocated by task 25784:
 kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:434 [inline]
 ____kasan_kmalloc mm/kasan/common.c:513 [inline]
 ____kasan_kmalloc mm/kasan/common.c:472 [inline]
 __kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:522
 kmalloc_array include/linux/slab.h:630 [inline]
 kcalloc include/linux/slab.h:661 [inline]
 tcp_cdg_init+0x10d/0x170 net/ipv4/tcp_cdg.c:380
 tcp_init_congestion_control+0xab/0x550 net/ipv4/tcp_cong.c:183
 tcp_reinit_congestion_control net/ipv4/tcp_cong.c:207 [inline]
 tcp_set_congestion_control+0x96c/0xaa0 net/ipv4/tcp_cong.c:381
 do_tcp_setsockopt net/ipv4/tcp.c:3401 [inline]
 tcp_setsockopt+0x620/0x2520 net/ipv4/tcp.c:3688
 mptcp_setsockopt+0x914/0x2050 net/mptcp/sockopt.c:735
 __sys_setsockopt+0x2db/0x610 net/socket.c:2176
 __do_sys_setsockopt net/socket.c:2187 [inline]
 __se_sys_setsockopt net/socket.c:2184 [inline]
 __x64_sys_setsockopt+0xba/0x150 net/socket.c:2184
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Freed by task 8:
 kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38
 kasan_set_track+0x21/0x30 mm/kasan/common.c:46
 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370
 ____kasan_slab_free mm/kasan/common.c:366 [inline]
 ____kasan_slab_free mm/kasan/common.c:328 [inline]
 __kasan_slab_free+0xff/0x130 mm/kasan/common.c:374
 kasan_slab_free include/linux/kasan.h:235 [inline]
 slab_free_hook mm/slub.c:1723 [inline]
 slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1749
 slab_free mm/slub.c:3513 [inline]
 kfree+0xf6/0x560 mm/slub.c:4561
 tcp_cleanup_congestion_control+0x70/0x120 net/ipv4/tcp_cong.c:216
 tcp_v4_destroy_sock+0xe2/0x760 net/ipv4/tcp_ipv4.c:2260
 tcp_v6_destroy_sock+0x11/0x20 net/ipv6/tcp_ipv6.c:1971
 inet_csk_destroy_sock+0x196/0x440 net/ipv4/inet_connection_sock.c:1010
 tcp_done+0x23b/0x340 net/ipv4/tcp.c:4452
 tcp_reset+0x16f/0x4a0 net/ipv4/tcp_input.c:4312
 tcp_validate_incoming+0xfc1/0x1c40 net/ipv4/tcp_input.c:5720
 tcp_rcv_established+0x5af/0x2130 net/ipv4/tcp_input.c:5932
 tcp_v6_do_rcv+0x461/0x1320 net/ipv6/tcp_ipv6.c:1522
 tcp_v6_rcv+0x23be/0x2d10 net/ipv6/tcp_ipv6.c:1766
 ip6_protocol_deliver_rcu+0x2e9/0x1cc0 net/ipv6/ip6_input.c:422
 ip6_input_finish+0x62/0x170 net/ipv6/ip6_input.c:463
 NF_HOOK include/linux/netfilter.h:307 [inline]
 NF_HOOK include/linux/netfilter.h:301 [inline]
 ip6_input+0x9c/0xd0 net/ipv6/ip6_input.c:472
 dst_input include/net/dst.h:460 [inline]
 ip6_rcv_finish+0x1ca/0x300 net/ipv6/ip6_input.c:76
 ip_sabotage_in net/bridge/br_netfilter_hooks.c:873 [inline]
 ip_sabotage_in+0x1fa/0x260 net/bridge/br_netfilter_hooks.c:864
 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline]
 nf_hook_slow+0xc5/0x1e0 net/netfilter/core.c:619
 nf_hook.constprop.0+0x3ac/0x650 include/linux/netfilter.h:262
 NF_HOOK include/linux/netfilter.h:305 [inline]
 ipv6_rcv+0x9e/0x3b0 net/ipv6/ip6_input.c:297
 __netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:5343
 __netif_receive_skb+0x24/0x1b0 net/core/dev.c:5457
 netif_receive_skb_internal net/core/dev.c:5543 [inline]
 netif_receive_skb+0x13e/0x8e0 net/core/dev.c:5602
 NF_HOOK include/linux/netfilter.h:307 [inline]
 NF_HOOK include/linux/netfilter.h:301 [inline]
 br_pass_frame_up+0x2d2/0x3e0 net/bridge/br_input.c:61
 br_handle_frame_finish+0x694/0x1850 net/bridge/br_input.c:174
 br_nf_hook_thresh+0x2a5/0x360 net/bridge/br_netfilter_hooks.c:1025
 br_nf_pre_routing_finish_ipv6+0x684/0xe00 net/bridge/br_netfilter_ipv6.c:206
 NF_HOOK include/linux/netfilter.h:307 [inline]
 br_nf_pre_routing_ipv6+0x42c/0x7b0 net/bridge/br_netfilter_ipv6.c:236
 br_nf_pre_routing+0x1477/0x1ec0 net/bridge/br_netfilter_hooks.c:505
 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline]
 nf_hook_bridge_pre net/bridge/br_input.c:230 [inline]
 br_handle_frame+0x8f8/0x1180 net/bridge/br_input.c:370
 __netif_receive_skb_core+0x9e1/0x3770 net/core/dev.c:5237
 __netif_receive_skb_one_core+0xae/0x180 net/core/dev.c:5341
 __netif_receive_skb+0x24/0x1b0 net/core/dev.c:5457
 process_backlog+0x2a5/0x6c0 net/core/dev.c:5789
 __napi_poll+0xaf/0x440 net/core/dev.c:6357
 napi_poll net/core/dev.c:6424 [inline]
 net_rx_action+0x801/0xb40 net/core/dev.c:6511
 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558

The buggy address belongs to the object at ffff88804a934900
 which belongs to the cache kmalloc-64 of size 64
The buggy address is located 0 bytes inside of
 64-byte region [ffff88804a934900, ffff88804a934940)
The buggy address belongs to the page:
page:ffffea00012a4d00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88804a934a00 pfn:0x4a934
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 ffffea000123f888 ffffea00010cd8c8 ffff888010c41640
raw: ffff88804a934a00 000000000020001e 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 25001, ts 372471882560, free_ts 372200334362
 prep_new_page mm/page_alloc.c:2418 [inline]
 get_page_from_freelist+0xa72/0x2f50 mm/page_alloc.c:4149
 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5369
 alloc_pages+0x1a7/0x300 mm/mempolicy.c:2191
 alloc_slab_page mm/slub.c:1793 [inline]
 allocate_slab mm/slub.c:1930 [inline]
 new_slab+0x32d/0x4a0 mm/slub.c:1993
 ___slab_alloc+0x918/0xfe0 mm/slub.c:3022
 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3109
 slab_alloc_node mm/slub.c:3200 [inline]
 slab_alloc mm/slub.c:3242 [inline]
 __kmalloc_track_caller+0x2e7/0x320 mm/slub.c:4925
 __do_krealloc mm/slab_common.c:1200 [inline]
 krealloc+0x87/0xf0 mm/slab_common.c:1233
 push_jmp_history kernel/bpf/verifier.c:2267 [inline]
 is_state_visited kernel/bpf/verifier.c:11000 [inline]
 do_check kernel/bpf/verifier.c:11140 [inline]
 do_check_common+0x33c9/0xc8e0 kernel/bpf/verifier.c:13416
 do_check_main kernel/bpf/verifier.c:13479 [inline]
 bpf_check+0x7389/0xbef0 kernel/bpf/verifier.c:14046
 bpf_prog_load+0xf4c/0x21e0 kernel/bpf/syscall.c:2343
 __sys_bpf+0x674/0x5980 kernel/bpf/syscall.c:4633
 __do_sys_bpf kernel/bpf/syscall.c:4737 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:4735 [inline]
 __x64_sys_bpf+0x75/0xb0 kernel/bpf/syscall.c:4735
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1338 [inline]
 free_pcp_prepare+0x374/0x870 mm/page_alloc.c:1389
 free_unref_page_prepare mm/page_alloc.c:3309 [inline]
 free_unref_page+0x19/0x690 mm/page_alloc.c:3388
 qlink_free mm/kasan/quarantine.c:146 [inline]
 qlist_free_all+0x5a/0xc0 mm/kasan/quarantine.c:165
 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:272
 ____kasan_kmalloc mm/kasan/common.c:479 [inline]
 __kasan_krealloc+0x131/0x170 mm/kasan/common.c:581
 kasan_krealloc include/linux/kasan.h:289 [inline]
 __do_krealloc mm/slab_common.c:1196 [inline]
 krealloc+0x54/0xf0 mm/slab_common.c:1233
 push_jmp_history kernel/bpf/verifier.c:2267 [inline]
 is_state_visited kernel/bpf/verifier.c:11000 [inline]
 do_check kernel/bpf/verifier.c:11140 [inline]
 do_check_common+0x33c9/0xc8e0 kernel/bpf/verifier.c:13416
 do_check_main kernel/bpf/verifier.c:13479 [inline]
 bpf_check+0x7389/0xbef0 kernel/bpf/verifier.c:14046
 bpf_prog_load+0xf4c/0x21e0 kernel/bpf/syscall.c:2343
 __sys_bpf+0x674/0x5980 kernel/bpf/syscall.c:4633
 __do_sys_bpf kernel/bpf/syscall.c:4737 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:4735 [inline]
 __x64_sys_bpf+0x75/0xb0 kernel/bpf/syscall.c:4735
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Memory state around the buggy address:
 ffff88804a934800: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff88804a934880: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff88804a934900: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
                   ^
 ffff88804a934980: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff88804a934a00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
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