R10: 000000007ffff000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffca154717f R14: 00007f24a6d88300 R15: 0000000000022000 ================================================================== BUG: KASAN: invalid-free in init_file+0x195/0x200 fs/file_table.c:163 Free of addr ffff88803998d800 by task syz-executor.3/8862 CPU: 1 PID: 8862 Comm: syz-executor.3 Not tainted 6.4.0-syzkaller-10096-gdfab92f27c60 #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_splice_read+0x1a5/0x670 fs/overlayfs/file.c:447 splice_direct_to_actor+0x2c4/0x9e0 fs/splice.c:1070 do_splice_direct+0x2ac/0x3f0 fs/splice.c:1195 do_sendfile+0x623/0x1070 fs/read_write.c:1254 __do_sys_sendfile64 fs/read_write.c:1322 [inline] __se_sys_sendfile64+0x17c/0x1e0 fs/read_write.c:1308 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: 0033:0x7f24a608c389 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:00007f24a6d88168 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f24a61abf80 RCX: 00007f24a608c389 RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000005 RBP: 00007f24a6d881d0 R08: 0000000000000000 R09: 0000000000000000 R10: 000000007ffff000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffca154717f R14: 00007f24a6d88300 R15: 0000000000022000 Allocated by task 8862: 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_splice_read+0x1a5/0x670 fs/overlayfs/file.c:447 splice_direct_to_actor+0x2c4/0x9e0 fs/splice.c:1070 do_splice_direct+0x2ac/0x3f0 fs/splice.c:1195 do_sendfile+0x623/0x1070 fs/read_write.c:1254 __do_sys_sendfile64 fs/read_write.c:1322 [inline] __se_sys_sendfile64+0x17c/0x1e0 fs/read_write.c:1308 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 __call_rcu_common kernel/rcu/tree.c:2649 [inline] call_rcu+0x167/0xa70 kernel/rcu/tree.c:2763 task_work_run+0x24a/0x300 kernel/task_work.c:179 get_signal+0x160e/0x17e0 kernel/signal.c:2653 arch_do_signal_or_restart+0x91/0x670 arch/x86/kernel/signal.c:308 exit_to_user_mode_loop+0x6a/0x100 kernel/entry/common.c:168 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline] syscall_exit_to_user_mode+0x64/0x280 kernel/entry/common.c:297 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd 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 task_work_add+0x8b/0x3a0 kernel/task_work.c:48 fput+0xe6/0x1b0 fs/file_table.c:434 ovl_release+0x3b/0x40 fs/overlayfs/file.c:189 __fput+0x3f8/0x950 fs/file_table.c:378 task_work_run+0x24a/0x300 kernel/task_work.c:179 get_signal+0x160e/0x17e0 kernel/signal.c:2653 arch_do_signal_or_restart+0x91/0x670 arch/x86/kernel/signal.c:308 exit_to_user_mode_loop+0x6a/0x100 kernel/entry/common.c:168 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline] syscall_exit_to_user_mode+0x64/0x280 kernel/entry/common.c:297 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff88803998d800 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 0 bytes inside of 480-byte region [ffff88803998d800, ffff88803998d9e0) The buggy address belongs to the physical page: page:ffffea0000e66300 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3998c head:ffffea0000e66300 order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0 anon flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000010200 ffff888012841c80 0000000000000000 dead000000000001 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 5016, tgid 5016 (syz-executor.5), ts 173222559537, free_ts 0 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] new_dir fs/proc/proc_sysctl.c:964 [inline] get_subdir fs/proc/proc_sysctl.c:1008 [inline] sysctl_mkdir_p fs/proc/proc_sysctl.c:1298 [inline] __register_sysctl_table+0xaa2/0x1310 fs/proc/proc_sysctl.c:1383 __devinet_sysctl_register+0x1dd/0x2a0 net/ipv4/devinet.c:2590 devinet_sysctl_register+0x13a/0x1a0 net/ipv4/devinet.c:2630 inetdev_init+0x291/0x4c0 net/ipv4/devinet.c:286 inetdev_event+0x342/0x1580 net/ipv4/devinet.c:1538 notifier_call_chain+0x18c/0x3a0 kernel/notifier.c:93 call_netdevice_notifiers_info net/core/dev.c:1962 [inline] call_netdevice_notifiers_extack net/core/dev.c:2000 [inline] call_netdevice_notifiers+0x149/0x1c0 net/core/dev.c:2014 register_netdevice+0x1349/0x1790 net/core/dev.c:10084 page_owner free stack trace missing Memory state around the buggy address: ffff88803998d700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88803998d780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88803998d800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff88803998d880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88803998d900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================