================================================================== BUG: KASAN: invalid-free in init_file+0x195/0x200 fs/file_table.c:163 Free of addr ffff88807e146c00 by task syz-executor.4/25501 CPU: 0 PID: 25501 Comm: syz-executor.4 Not tainted 6.4.0-syzkaller-09904-ga507db1d8fdc #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0x163/0x540 mm/kasan/report.c:475 kasan_report_invalid_free+0xeb/0x110 mm/kasan/report.c:550 ____kasan_slab_free+0xfb/0x120 kasan_slab_free include/linux/kasan.h:162 [inline] slab_free_hook mm/slub.c:1792 [inline] slab_free_freelist_hook mm/slub.c:1818 [inline] slab_free mm/slub.c:3801 [inline] kmem_cache_free+0x292/0x500 mm/slub.c:3823 init_file+0x195/0x200 fs/file_table.c:163 alloc_empty_backing_file+0x67/0xd0 fs/file_table.c:267 backing_file_open+0x26/0x100 fs/open.c:1171 ovl_open_realfile+0x1f6/0x350 fs/overlayfs/file.c:64 ovl_real_fdget_meta+0x3be/0x4b0 fs/overlayfs/file.c:131 ovl_real_fdget fs/overlayfs/file.c:152 [inline] ovl_flush+0x191/0x450 fs/overlayfs/file.c:711 filp_close+0xb5/0x160 fs/open.c:1517 do_dup2+0x3dd/0x470 fs/file.c:1124 __do_sys_dup3 fs/file.c:1252 [inline] __se_sys_dup3 fs/file.c:1250 [inline] __x64_sys_dup3+0x7a/0x90 fs/file.c:1250 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f4a6968c389 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f4a6a305168 EFLAGS: 00000246 ORIG_RAX: 0000000000000124 RAX: ffffffffffffffda RBX: 00007f4a697abf80 RCX: 00007f4a6968c389 RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000004 RBP: 00007f4a6a3051d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffc1c8ca32f R14: 00007f4a6a305300 R15: 0000000000022000 Allocated by task 25501: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4f/0x70 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:383 kmalloc include/linux/slab.h:579 [inline] kzalloc include/linux/slab.h:700 [inline] alloc_empty_backing_file+0x52/0xd0 fs/file_table.c:263 backing_file_open+0x26/0x100 fs/open.c:1171 ovl_open_realfile+0x1f6/0x350 fs/overlayfs/file.c:64 ovl_real_fdget_meta+0x3be/0x4b0 fs/overlayfs/file.c:131 ovl_real_fdget fs/overlayfs/file.c:152 [inline] ovl_flush+0x191/0x450 fs/overlayfs/file.c:711 filp_close+0xb5/0x160 fs/open.c:1517 do_dup2+0x3dd/0x470 fs/file.c:1124 __do_sys_dup3 fs/file.c:1252 [inline] __se_sys_dup3 fs/file.c:1250 [inline] __x64_sys_dup3+0x7a/0x90 fs/file.c:1250 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Last potentially related work creation: kasan_save_stack+0x3f/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xad/0xc0 mm/kasan/generic.c:491 insert_work+0x54/0x3d0 kernel/workqueue.c:1553 __queue_work+0xb37/0xf10 kernel/workqueue.c:1714 call_timer_fn+0x178/0x580 kernel/time/timer.c:1700 expire_timers kernel/time/timer.c:1746 [inline] __run_timers+0x67a/0x860 kernel/time/timer.c:2022 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2035 __do_softirq+0x2ab/0x908 kernel/softirq.c:553 Second to last potentially related work creation: kasan_save_stack+0x3f/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xad/0xc0 mm/kasan/generic.c:491 insert_work+0x54/0x3d0 kernel/workqueue.c:1553 __queue_work+0xb37/0xf10 kernel/workqueue.c:1714 call_timer_fn+0x178/0x580 kernel/time/timer.c:1700 expire_timers kernel/time/timer.c:1746 [inline] __run_timers+0x67a/0x860 kernel/time/timer.c:2022 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2035 __do_softirq+0x2ab/0x908 kernel/softirq.c:553 The buggy address belongs to the object at ffff88807e146c00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 0 bytes inside of 480-byte region [ffff88807e146c00, ffff88807e146de0) The buggy address belongs to the physical page: page:ffffea0001f85100 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7e144 head:ffffea0001f85100 order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0 ksm flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000010200 ffff888012841c80 ffffea0001eea600 dead000000000003 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5035, tgid 5035 (syz-executor.0), ts 206068408321, free_ts 206015313921 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1e6/0x210 mm/page_alloc.c:1570 prep_new_page mm/page_alloc.c:1577 [inline] get_page_from_freelist+0x31e8/0x3370 mm/page_alloc.c:3221 __alloc_pages+0x255/0x670 mm/page_alloc.c:4477 alloc_slab_page+0x6a/0x160 mm/slub.c:1862 allocate_slab mm/slub.c:2009 [inline] new_slab+0x84/0x2f0 mm/slub.c:2062 ___slab_alloc+0xade/0x1100 mm/slub.c:3215 __slab_alloc mm/slub.c:3314 [inline] __slab_alloc_node mm/slub.c:3367 [inline] slab_alloc_node mm/slub.c:3460 [inline] __kmem_cache_alloc_node+0x1af/0x270 mm/slub.c:3509 __do_kmalloc_node mm/slab_common.c:984 [inline] __kmalloc+0xa8/0x230 mm/slab_common.c:998 kmalloc include/linux/slab.h:583 [inline] kzalloc include/linux/slab.h:700 [inline] fib6_info_alloc+0x30/0xd0 net/ipv6/ip6_fib.c:155 ip6_route_info_create+0x446/0x12c0 net/ipv6/route.c:3746 ip6_route_add+0x26/0x120 net/ipv6/route.c:3840 addrconf_add_mroute net/ipv6/addrconf.c:2489 [inline] addrconf_add_dev+0x354/0x500 net/ipv6/addrconf.c:2507 inet6_addr_add+0x1b0/0x9f0 net/ipv6/addrconf.c:2937 inet6_rtm_newaddr+0x85b/0x26e0 net/ipv6/addrconf.c:4933 rtnetlink_rcv_msg+0x82b/0xf50 net/core/rtnetlink.c:6424 netlink_rcv_skb+0x1df/0x430 net/netlink/af_netlink.c:2549 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1161 [inline] free_unref_page_prepare+0x903/0xa30 mm/page_alloc.c:2348 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2443 discard_slab mm/slub.c:2108 [inline] __unfreeze_partials+0x1dc/0x220 mm/slub.c:2647 put_cpu_partial+0x116/0x180 mm/slub.c:2723 __slab_free+0x2b6/0x390 mm/slub.c:3671 qlist_free_all+0x22/0x60 mm/kasan/quarantine.c:185 kasan_quarantine_reduce+0x14b/0x160 mm/kasan/quarantine.c:292 __kasan_slab_alloc+0x23/0x70 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:186 [inline] slab_post_alloc_hook+0x68/0x3a0 mm/slab.h:750 slab_alloc_node mm/slub.c:3470 [inline] kmem_cache_alloc_node+0x149/0x330 mm/slub.c:3515 __alloc_skb+0x181/0x420 net/core/skbuff.c:634 alloc_skb include/linux/skbuff.h:1289 [inline] nlmsg_new include/net/netlink.h:1003 [inline] netlink_ack+0x36d/0x12a0 net/netlink/af_netlink.c:2486 netlink_rcv_skb+0x25c/0x430 net/netlink/af_netlink.c:2555 netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline] netlink_unicast+0x7c3/0x990 net/netlink/af_netlink.c:1365 netlink_sendmsg+0xa2a/0xd60 net/netlink/af_netlink.c:1914 sock_sendmsg_nosec net/socket.c:725 [inline] sock_sendmsg net/socket.c:748 [inline] __sys_sendto+0x484/0x640 net/socket.c:2134 Memory state around the buggy address: ffff88807e146b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807e146b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88807e146c00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff88807e146c80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88807e146d00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================