================================================================== BUG: KASAN: double-free in tcp_disconnect+0x980/0x1e20 net/ipv4/tcp.c:3145 CPU: 0 PID: 4380 Comm: kworker/0:9 Not tainted 6.0.0-syzkaller-06205-gffb39098bf87 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 Workqueue: events mptcp_worker Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:317 [inline] print_report.cold+0x2ba/0x6e9 mm/kasan/report.c:433 kasan_report_invalid_free+0x81/0x190 mm/kasan/report.c:462 ____kasan_slab_free+0x162/0x1a0 mm/kasan/common.c:356 kasan_slab_free include/linux/kasan.h:200 [inline] __cache_free mm/slab.c:3418 [inline] kfree+0x173/0x390 mm/slab.c:3786 tcp_disconnect+0x980/0x1e20 net/ipv4/tcp.c:3145 __mptcp_close_ssk+0x5ca/0x7e0 net/mptcp/protocol.c:2327 mptcp_do_fastclose net/mptcp/protocol.c:2592 [inline] mptcp_worker+0x78c/0xff0 net/mptcp/protocol.c:2627 process_one_work+0x991/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e4/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Allocated by task 3643: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:437 [inline] ____kasan_kmalloc mm/kasan/common.c:516 [inline] ____kasan_kmalloc mm/kasan/common.c:475 [inline] __kasan_kmalloc+0xa6/0xd0 mm/kasan/common.c:525 kasan_kmalloc include/linux/kasan.h:234 [inline] __do_kmalloc mm/slab.c:3686 [inline] __kmalloc+0x1f9/0x4a0 mm/slab.c:3695 kmalloc include/linux/slab.h:605 [inline] kzalloc include/linux/slab.h:733 [inline] ext4_htree_store_dirent+0x89/0x5f0 fs/ext4/dir.c:474 htree_dirblock_to_tree+0x734/0xcd0 fs/ext4/namei.c:1120 ext4_htree_fill_tree+0x323/0xc30 fs/ext4/namei.c:1199 ext4_dx_readdir fs/ext4/dir.c:597 [inline] ext4_readdir+0x1dfe/0x3870 fs/ext4/dir.c:142 iterate_dir+0x56a/0x6f0 fs/readdir.c:65 __do_sys_getdents64 fs/readdir.c:369 [inline] __se_sys_getdents64 fs/readdir.c:354 [inline] __x64_sys_getdents64+0x13a/0x2c0 fs/readdir.c:354 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+0x63/0xcd Freed by task 3643: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:45 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:367 [inline] ____kasan_slab_free+0x13d/0x1a0 mm/kasan/common.c:329 kasan_slab_free include/linux/kasan.h:200 [inline] __cache_free mm/slab.c:3418 [inline] kfree+0x173/0x390 mm/slab.c:3786 free_rb_tree_fname+0x7c/0xd0 fs/ext4/dir.c:426 ext4_htree_free_dir_info fs/ext4/dir.c:448 [inline] ext4_release_dir+0x41/0x60 fs/ext4/dir.c:638 __fput+0x277/0x9d0 fs/file_table.c:320 task_work_run+0xdd/0x1a0 kernel/task_work.c:177 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop kernel/entry/common.c:169 [inline] exit_to_user_mode_prepare+0x23c/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:294 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff888071fa5100 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 0 bytes inside of 64-byte region [ffff888071fa5100, ffff888071fa5140) The buggy address belongs to the physical page: page:ffffea0001c7e940 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x71fa5 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea00007fe988 ffffea0000922348 ffff888011840200 raw: 0000000000000000 ffff888071fa5000 0000000100000020 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 0x3420c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_COMP|__GFP_HARDWALL|__GFP_THISNODE), pid 3647, tgid 3647 (syz-executor.3), ts 1096375362111, free_ts 1096375298702 prep_new_page mm/page_alloc.c:2532 [inline] get_page_from_freelist+0x109b/0x2ce0 mm/page_alloc.c:4283 __alloc_pages+0x1c7/0x510 mm/page_alloc.c:5549 __alloc_pages_node include/linux/gfp.h:243 [inline] kmem_getpages mm/slab.c:1363 [inline] cache_grow_begin+0x75/0x360 mm/slab.c:2569 cache_alloc_refill+0x27f/0x380 mm/slab.c:2942 ____cache_alloc mm/slab.c:3018 [inline] ____cache_alloc mm/slab.c:3001 [inline] slab_alloc_node mm/slab.c:3220 [inline] kmem_cache_alloc_node_trace+0x50a/0x570 mm/slab.c:3601 kmalloc_node include/linux/slab.h:618 [inline] kzalloc_node include/linux/slab.h:744 [inline] __get_vm_area_node+0xed/0x3f0 mm/vmalloc.c:2477 __vmalloc_node_range+0x250/0x13a0 mm/vmalloc.c:3156 __vmalloc_node mm/vmalloc.c:3261 [inline] vzalloc+0x67/0x80 mm/vmalloc.c:3334 do_ip6t_get_ctl+0x60f/0xa10 net/ipv6/netfilter/ip6_tables.c:817 nf_getsockopt+0x72/0xd0 net/netfilter/nf_sockopt.c:116 ipv6_getsockopt+0x1eb/0x2a0 net/ipv6/ipv6_sockglue.c:1509 tcp_getsockopt+0x95/0xf0 net/ipv4/tcp.c:4399 __sys_getsockopt+0x216/0x690 net/socket.c:2296 __do_sys_getsockopt net/socket.c:2311 [inline] __se_sys_getsockopt net/socket.c:2308 [inline] __x64_sys_getsockopt+0xba/0x150 net/socket.c:2308 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+0x63/0xcd page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1449 [inline] free_pcp_prepare+0x5e4/0xd20 mm/page_alloc.c:1499 free_unref_page_prepare mm/page_alloc.c:3380 [inline] free_unref_page+0x19/0x4d0 mm/page_alloc.c:3476 __vunmap+0x85d/0xd30 mm/vmalloc.c:2696 __vfree+0x3c/0xd0 mm/vmalloc.c:2744 vfree+0x5a/0x90 mm/vmalloc.c:2775 copy_entries_to_user net/ipv6/netfilter/ip6_tables.c:884 [inline] get_entries net/ipv6/netfilter/ip6_tables.c:1041 [inline] do_ip6t_get_ctl+0x82f/0xa10 net/ipv6/netfilter/ip6_tables.c:1672 nf_getsockopt+0x72/0xd0 net/netfilter/nf_sockopt.c:116 ipv6_getsockopt+0x1eb/0x2a0 net/ipv6/ipv6_sockglue.c:1509 tcp_getsockopt+0x95/0xf0 net/ipv4/tcp.c:4399 __sys_getsockopt+0x216/0x690 net/socket.c:2296 __do_sys_getsockopt net/socket.c:2311 [inline] __se_sys_getsockopt net/socket.c:2308 [inline] __x64_sys_getsockopt+0xba/0x150 net/socket.c:2308 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+0x63/0xcd Memory state around the buggy address: ffff888071fa5000: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888071fa5080: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc >ffff888071fa5100: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff888071fa5180: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc ffff888071fa5200: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================