================================================================== BUG: KASAN: slab-use-after-free in nla_ok include/net/netlink.h:1230 [inline] BUG: KASAN: slab-use-after-free in nla_find+0x120/0x130 lib/nlattr.c:746 Read of size 2 at addr ffff88802d891ca0 by task syz-executor.1/32590 CPU: 1 PID: 32590 Comm: syz-executor.1 Not tainted 6.7.0-rc5-syzkaller-01062-g358105ab92fc #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0xc4/0x620 mm/kasan/report.c:475 kasan_report+0xda/0x110 mm/kasan/report.c:588 nla_ok include/net/netlink.h:1230 [inline] nla_find+0x120/0x130 lib/nlattr.c:746 nla_find_nested include/net/netlink.h:1260 [inline] ____bpf_skb_get_nlattr_nest net/core/filter.c:209 [inline] bpf_skb_get_nlattr_nest+0x178/0x1f0 net/core/filter.c:192 Allocated by task 25351: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 __kasan_slab_alloc+0x81/0x90 mm/kasan/common.c:328 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook mm/slab.h:763 [inline] slab_alloc_node mm/slub.c:3478 [inline] slab_alloc mm/slub.c:3486 [inline] __kmem_cache_alloc_lru mm/slub.c:3493 [inline] kmem_cache_alloc_lru+0x219/0x6f0 mm/slub.c:3509 alloc_inode_sb include/linux/fs.h:2937 [inline] mqueue_alloc_inode+0x25/0x40 ipc/mqueue.c:501 alloc_inode+0x5d/0x220 fs/inode.c:261 new_inode_pseudo fs/inode.c:1006 [inline] new_inode+0x22/0x260 fs/inode.c:1032 mqueue_get_inode+0x2e/0xd50 ipc/mqueue.c:297 mqueue_fill_super+0x112/0x200 ipc/mqueue.c:415 vfs_get_super fs/super.c:1338 [inline] get_tree_nodev+0xd6/0x180 fs/super.c:1357 mqueue_get_tree+0xed/0x130 ipc/mqueue.c:435 vfs_get_tree+0x8c/0x370 fs/super.c:1771 fc_mount+0x16/0xc0 fs/namespace.c:1114 mq_create_mount ipc/mqueue.c:485 [inline] mq_init_ns+0x442/0x630 ipc/mqueue.c:1700 create_ipc_ns ipc/namespace.c:73 [inline] copy_ipcs+0x398/0x620 ipc/namespace.c:112 create_new_namespaces+0x20a/0xb10 kernel/nsproxy.c:90 unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:228 ksys_unshare+0x443/0x9b0 kernel/fork.c:3433 __do_sys_unshare kernel/fork.c:3504 [inline] __se_sys_unshare kernel/fork.c:3502 [inline] __x64_sys_unshare+0x31/0x40 kernel/fork.c:3502 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b Last potentially related work creation: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:492 __call_rcu_common.constprop.0+0x9a/0x7a0 kernel/rcu/tree.c:2681 destroy_inode+0x129/0x1b0 fs/inode.c:316 iput_final fs/inode.c:1777 [inline] iput.part.0+0x560/0x7b0 fs/inode.c:1803 iput+0x5c/0x80 fs/inode.c:1793 dentry_unlink_inode+0x292/0x430 fs/dcache.c:401 __dentry_kill+0x3b8/0x640 fs/dcache.c:607 dentry_kill fs/dcache.c:733 [inline] dput+0x7eb/0xd90 fs/dcache.c:913 do_one_tree fs/dcache.c:1684 [inline] shrink_dcache_for_umount+0x127/0x340 fs/dcache.c:1698 generic_shutdown_super+0x76/0x3d0 fs/super.c:668 kill_anon_super fs/super.c:1295 [inline] kill_litter_super+0x70/0xa0 fs/super.c:1305 deactivate_locked_super+0xbc/0x1a0 fs/super.c:484 deactivate_super+0xde/0x100 fs/super.c:517 cleanup_mnt+0x222/0x450 fs/namespace.c:1256 mntput_no_expire+0x820/0xaf0 fs/namespace.c:1342 mntput+0x6b/0x90 fs/namespace.c:1352 free_ipc_ns ipc/namespace.c:152 [inline] free_ipc+0x184/0x2d0 ipc/namespace.c:179 process_one_work+0x886/0x15d0 kernel/workqueue.c:2627 process_scheduled_works kernel/workqueue.c:2700 [inline] worker_thread+0x8b9/0x1290 kernel/workqueue.c:2781 kthread+0x2c6/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 The buggy address belongs to the object at ffff88802d891b00 which belongs to the cache mqueue_inode_cache of size 1600 The buggy address is located 416 bytes inside of freed 1600-byte region [ffff88802d891b00, ffff88802d892140) The buggy address belongs to the physical page: page:ffffea0000b62400 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88802d8972c0 pfn:0x2d890 head:ffffea0000b62400 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff888029bb8101 anon flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000840 ffff888140ecdc80 0000000000000000 0000000000000001 raw: ffff88802d8972c0 0000000080120000 00000001ffffffff ffff888029bb8101 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 25351, tgid 25347 (syz-executor.3), ts 966931214864, free_ts 966810677805 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2d0/0x350 mm/page_alloc.c:1544 prep_new_page mm/page_alloc.c:1551 [inline] get_page_from_freelist+0xa28/0x3730 mm/page_alloc.c:3319 __alloc_pages+0x22e/0x2420 mm/page_alloc.c:4575 alloc_pages_mpol+0x258/0x5f0 mm/mempolicy.c:2133 alloc_slab_page mm/slub.c:1870 [inline] allocate_slab mm/slub.c:2017 [inline] new_slab+0x283/0x3c0 mm/slub.c:2070 ___slab_alloc+0x979/0x1500 mm/slub.c:3223 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3322 __slab_alloc_node mm/slub.c:3375 [inline] slab_alloc_node mm/slub.c:3468 [inline] slab_alloc mm/slub.c:3486 [inline] __kmem_cache_alloc_lru mm/slub.c:3493 [inline] kmem_cache_alloc_lru+0x4a1/0x6f0 mm/slub.c:3509 alloc_inode_sb include/linux/fs.h:2937 [inline] mqueue_alloc_inode+0x25/0x40 ipc/mqueue.c:501 alloc_inode+0x5d/0x220 fs/inode.c:261 new_inode_pseudo fs/inode.c:1006 [inline] new_inode+0x22/0x260 fs/inode.c:1032 mqueue_get_inode+0x2e/0xd50 ipc/mqueue.c:297 mqueue_fill_super+0x112/0x200 ipc/mqueue.c:415 vfs_get_super fs/super.c:1338 [inline] get_tree_nodev+0xd6/0x180 fs/super.c:1357 mqueue_get_tree+0xed/0x130 ipc/mqueue.c:435 vfs_get_tree+0x8c/0x370 fs/super.c:1771 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1144 [inline] free_unref_page_prepare+0x53c/0xb80 mm/page_alloc.c:2354 free_unref_page+0x33/0x3b0 mm/page_alloc.c:2494 __unfreeze_partials+0x226/0x240 mm/slub.c:2655 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x18e/0x1d0 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x65/0x90 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook mm/slab.h:763 [inline] slab_alloc_node mm/slub.c:3478 [inline] slab_alloc mm/slub.c:3486 [inline] __kmem_cache_alloc_lru mm/slub.c:3493 [inline] kmem_cache_alloc+0x15d/0x2f0 mm/slub.c:3502 create_nsproxy kernel/nsproxy.c:56 [inline] create_new_namespaces+0x30/0xb10 kernel/nsproxy.c:74 unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:228 ksys_unshare+0x443/0x9b0 kernel/fork.c:3433 __do_sys_unshare kernel/fork.c:3504 [inline] __se_sys_unshare kernel/fork.c:3502 [inline] __x64_sys_unshare+0x31/0x40 kernel/fork.c:3502 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b Memory state around the buggy address: ffff88802d891b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802d891c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88802d891c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802d891d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802d891d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================