================================================================== BUG: KASAN: double-free in tcp_disconnect+0x980/0x1e20 net/ipv4/tcp.c:3145 CPU: 1 PID: 4515 Comm: kworker/1:10 Not tainted 6.0.0-syzkaller-06475-g4c86114194e6 #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 2974: 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] tomoyo_encode2.part.0+0xe9/0x3a0 security/tomoyo/realpath.c:45 tomoyo_encode2 security/tomoyo/realpath.c:31 [inline] tomoyo_encode+0x28/0x50 security/tomoyo/realpath.c:80 tomoyo_realpath_from_path+0x181/0x600 security/tomoyo/realpath.c:283 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_perm+0x21b/0x400 security/tomoyo/file.c:822 security_inode_getattr+0xcf/0x140 security/security.c:1345 vfs_getattr fs/stat.c:158 [inline] vfs_statx+0x16e/0x430 fs/stat.c:233 vfs_fstatat+0x8c/0xb0 fs/stat.c:267 __do_sys_newfstatat+0x94/0x120 fs/stat.c:437 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 2974: 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 tomoyo_path_perm+0x23d/0x400 security/tomoyo/file.c:842 security_inode_getattr+0xcf/0x140 security/security.c:1345 vfs_getattr fs/stat.c:158 [inline] vfs_statx+0x16e/0x430 fs/stat.c:233 vfs_fstatat+0x8c/0xb0 fs/stat.c:267 __do_sys_newfstatat+0x94/0x120 fs/stat.c:437 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 The buggy address belongs to the object at ffff888079c08880 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 0 bytes inside of 64-byte region [ffff888079c08880, ffff888079c088c0) The buggy address belongs to the physical page: page:ffffea0001e70200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x79c08 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea0000825088 ffffea000075b7c8 ffff888011840200 raw: 0000000000000000 ffff888079c08000 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 0x242040(__GFP_IO|__GFP_NOWARN|__GFP_COMP|__GFP_THISNODE), pid 2975, tgid 2975 (udevadm), ts 16042010358, free_ts 16041901362 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] __do_cache_alloc mm/slab.c:3246 [inline] slab_alloc mm/slab.c:3287 [inline] __do_kmalloc mm/slab.c:3684 [inline] __kmalloc+0x3a1/0x4a0 mm/slab.c:3695 kmalloc include/linux/slab.h:605 [inline] kzalloc include/linux/slab.h:733 [inline] tomoyo_encode2.part.0+0xe9/0x3a0 security/tomoyo/realpath.c:45 tomoyo_encode2 security/tomoyo/realpath.c:31 [inline] tomoyo_encode+0x28/0x50 security/tomoyo/realpath.c:80 tomoyo_realpath_from_path+0x181/0x600 security/tomoyo/realpath.c:283 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_perm+0x21b/0x400 security/tomoyo/file.c:822 security_inode_getattr+0xcf/0x140 security/security.c:1345 vfs_getattr fs/stat.c:158 [inline] vfs_statx+0x16e/0x430 fs/stat.c:233 vfs_fstatat+0x8c/0xb0 fs/stat.c:267 __do_sys_newfstatat+0x94/0x120 fs/stat.c:437 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 selinux_genfs_get_sid security/selinux/hooks.c:1303 [inline] inode_doinit_with_dentry+0x868/0x12e0 security/selinux/hooks.c:1498 selinux_d_instantiate+0x23/0x30 security/selinux/hooks.c:6329 security_d_instantiate+0x50/0xe0 security/security.c:2061 d_splice_alias+0x8c/0xc80 fs/dcache.c:3155 kernfs_iop_lookup+0x27f/0x320 fs/kernfs/dir.c:1168 __lookup_slow+0x24c/0x460 fs/namei.c:1685 lookup_slow fs/namei.c:1702 [inline] walk_component+0x33f/0x5a0 fs/namei.c:1993 lookup_last fs/namei.c:2450 [inline] path_lookupat+0x1ba/0x840 fs/namei.c:2474 filename_lookup+0x1ce/0x590 fs/namei.c:2503 user_path_at_empty+0x42/0x60 fs/namei.c:2876 do_readlinkat+0xcd/0x2f0 fs/stat.c:468 __do_sys_readlink fs/stat.c:501 [inline] __se_sys_readlink fs/stat.c:498 [inline] __x64_sys_readlink+0x74/0xb0 fs/stat.c:498 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: ffff888079c08780: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc ffff888079c08800: 00 00 00 00 00 00 00 03 fc fc fc fc fc fc fc fc >ffff888079c08880: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff888079c08900: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888079c08980: 00 00 00 00 00 00 00 02 fc fc fc fc fc fc fc fc ==================================================================