9pnet: Found fid 1 not clunked ================================================================== BUG: KASAN: slab-use-after-free in p9_fid_destroy net/9p/client.c:885 [inline] BUG: KASAN: slab-use-after-free in p9_client_destroy+0x183/0x660 net/9p/client.c:1071 Read of size 8 at addr ffff88801aac4880 by task syz-executor.1/8080 CPU: 1 PID: 8080 Comm: syz-executor.1 Not tainted 6.9.0-rc2-next-20240404-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 p9_fid_destroy net/9p/client.c:885 [inline] p9_client_destroy+0x183/0x660 net/9p/client.c:1071 v9fs_session_close+0x51/0x210 fs/9p/v9fs.c:506 v9fs_kill_super+0x5c/0x90 fs/9p/vfs_super.c:196 deactivate_locked_super+0xc4/0x130 fs/super.c:472 cleanup_mnt+0x426/0x4c0 fs/namespace.c:1267 task_work_run+0x24f/0x310 kernel/task_work.c:180 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x168/0x360 kernel/entry/common.c:218 do_syscall_64+0x10a/0x240 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x72/0x7a RIP: 0033:0x7ff814e7f197 Code: b0 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 b0 ff ff ff f7 d8 64 89 02 b8 RSP: 002b:00007ffca6892918 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007ff814e7f197 RDX: 0000000000000000 RSI: 000000000000000a RDI: 00007ffca68929d0 RBP: 00007ffca68929d0 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffca6893a90 R13: 00007ff814ec93b9 R14: 00000000000403b3 R15: 0000000000000015 Allocated by task 9076: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] kmalloc_trace_noprof+0x19c/0x2b0 mm/slub.c:4100 kmalloc_noprof include/linux/slab.h:660 [inline] kzalloc_noprof include/linux/slab.h:775 [inline] p9_fid_create+0x4f/0x230 net/9p/client.c:854 p9_client_walk+0x103/0x690 net/9p/client.c:1155 clone_fid fs/9p/fid.h:23 [inline] v9fs_fid_clone fs/9p/fid.h:33 [inline] v9fs_file_open+0x285/0xa60 fs/9p/vfs_file.c:56 do_dentry_open+0x907/0x15a0 fs/open.c:955 do_open fs/namei.c:3642 [inline] path_openat+0x2860/0x3240 fs/namei.c:3799 do_filp_open+0x235/0x490 fs/namei.c:3826 do_sys_openat2+0x13e/0x1d0 fs/open.c:1406 do_sys_open fs/open.c:1421 [inline] __do_sys_creat fs/open.c:1497 [inline] __se_sys_creat fs/open.c:1491 [inline] __x64_sys_creat+0x123/0x170 fs/open.c:1491 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x72/0x7a Freed by task 12: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579 poison_slab_object+0xe0/0x150 mm/kasan/common.c:240 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2180 [inline] slab_free mm/slub.c:4384 [inline] kfree+0x149/0x350 mm/slub.c:4505 p9_fid_destroy net/9p/client.c:890 [inline] p9_client_clunk+0x1ce/0x260 net/9p/client.c:1457 netfs_free_request+0x244/0x5e0 fs/netfs/objects.c:133 netfs_write_collection_worker+0x5079/0x5630 fs/netfs/write_collect.c:706 process_one_work kernel/workqueue.c:3218 [inline] process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3299 worker_thread+0x86d/0xd70 kernel/workqueue.c:3380 kthread+0x2f0/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243 The buggy address belongs to the object at ffff88801aac4880 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 0 bytes inside of freed 96-byte region [ffff88801aac4880, ffff88801aac48e0) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1aac4 flags: 0xfff80000000000(node=0|zone=1|lastcpupid=0xfff) page_type: 0xffffefff(slab) raw: 00fff80000000000 ffff888015041780 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000200020 00000001ffffefff 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 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 1, tgid -502740099 (swapper/0), ts 1, free_ts 3753409963 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1490 prep_new_page mm/page_alloc.c:1498 [inline] get_page_from_freelist+0x2e7e/0x2f40 mm/page_alloc.c:3454 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4712 __alloc_pages_node_noprof include/linux/gfp.h:244 [inline] alloc_pages_node_noprof include/linux/gfp.h:271 [inline] alloc_slab_page+0x5f/0x120 mm/slub.c:2249 allocate_slab+0x5a/0x2e0 mm/slub.c:2412 new_slab mm/slub.c:2465 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3615 __slab_alloc+0x58/0xa0 mm/slub.c:3705 __slab_alloc_node mm/slub.c:3758 [inline] slab_alloc_node mm/slub.c:3936 [inline] kmalloc_trace_noprof+0x1d5/0x2b0 mm/slub.c:4095 kmalloc_noprof include/linux/slab.h:660 [inline] kzalloc_noprof include/linux/slab.h:775 [inline] acpi_os_allocate_zeroed include/acpi/platform/aclinuxex.h:57 [inline] acpi_ut_evaluate_object+0x108/0x4a0 drivers/acpi/acpica/uteval.c:50 acpi_ut_execute_CID+0xd1/0x740 drivers/acpi/acpica/utids.c:214 acpi_ns_get_device_callback+0x33e/0x5a0 drivers/acpi/acpica/nsxfeval.c:694 acpi_ns_walk_namespace+0x294/0x4f0 acpi_get_devices+0x143/0x1a0 drivers/acpi/acpica/nsxfeval.c:805 acpi_processor_init+0xe/0x30 drivers/acpi/acpi_processor.c:769 acpi_scan_init+0xb7/0x730 drivers/acpi/scan.c:2675 acpi_init+0x159/0x240 drivers/acpi/bus.c:1448 page last free pid 1 tgid 1 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1110 [inline] free_unref_page+0xd3c/0xec0 mm/page_alloc.c:2617 discard_slab mm/slub.c:2511 [inline] __put_partials+0xeb/0x130 mm/slub.c:2980 put_cpu_partial+0x17c/0x250 mm/slub.c:3055 __slab_free+0x2ea/0x3d0 mm/slub.c:4254 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9e/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_remove_cache+0x169/0x190 mm/kasan/quarantine.c:378 kmem_cache_shrink+0xd/0x20 mm/slab_common.c:518 acpi_os_purge_cache+0x15/0x20 drivers/acpi/osl.c:1573 acpi_purge_cached_objects+0xb8/0xc0 drivers/acpi/acpica/utxface.c:240 acpi_initialize_objects+0x2e/0xa0 drivers/acpi/acpica/utxfinit.c:250 acpi_bus_init+0xda/0xbc0 drivers/acpi/bus.c:1350 acpi_init+0xb4/0x240 drivers/acpi/bus.c:1435 do_one_initcall+0x248/0x880 init/main.c:1258 do_initcall_level+0x157/0x210 init/main.c:1320 do_initcalls+0x3f/0x80 init/main.c:1336 kernel_init_freeable+0x435/0x5d0 init/main.c:1569 Memory state around the buggy address: ffff88801aac4780: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc ffff88801aac4800: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc >ffff88801aac4880: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff88801aac4900: 00 00 00 00 00 00 00 00 06 fc fc fc fc fc fc fc ffff88801aac4980: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ==================================================================