================================================================== BUG: KASAN: slab-use-after-free in unix_edge_successor net/unix/garbage.c:109 [inline] BUG: KASAN: slab-use-after-free in unix_del_edge net/unix/garbage.c:162 [inline] BUG: KASAN: slab-use-after-free in unix_del_edges+0x12b/0x540 net/unix/garbage.c:232 Read of size 8 at addr ffff888112144630 by task kworker/u8:7/600 CPU: 1 PID: 600 Comm: kworker/u8:7 Not tainted 6.9.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Workqueue: events_unbound __unix_gc Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x108/0x280 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 unix_edge_successor net/unix/garbage.c:109 [inline] unix_del_edge net/unix/garbage.c:162 [inline] unix_del_edges+0x12b/0x540 net/unix/garbage.c:232 unix_destroy_fpl+0x44/0x1d0 net/unix/garbage.c:283 unix_detach_fds net/unix/af_unix.c:1825 [inline] unix_destruct_scm+0x15b/0x310 net/unix/af_unix.c:1885 skb_release_head_state+0x90/0x150 net/core/skbuff.c:1187 skb_release_all net/core/skbuff.c:1199 [inline] __kfree_skb net/core/skbuff.c:1215 [inline] kfree_skb_reason+0xd5/0x2d0 net/core/skbuff.c:1251 __skb_queue_purge_reason include/linux/skbuff.h:3242 [inline] __skb_queue_purge include/linux/skbuff.h:3247 [inline] __unix_gc+0x18e4/0x19f0 net/unix/garbage.c:660 process_one_work kernel/workqueue.c:3254 [inline] process_scheduled_works+0x8b6/0x12f0 kernel/workqueue.c:3335 worker_thread+0x869/0xca0 kernel/workqueue.c:3416 kthread+0x268/0x2c0 kernel/kthread.c:388 ret_from_fork+0x32/0x60 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243 Allocated by task 7049: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:312 [inline] __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:338 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3798 [inline] slab_alloc_node mm/slub.c:3845 [inline] kmem_cache_alloc+0x15f/0x390 mm/slub.c:3852 sk_prot_alloc+0x52/0x1c0 net/core/sock.c:2074 sk_alloc+0x35/0x560 net/core/sock.c:2133 unix_create1+0x8c/0x730 unix_create+0x114/0x1d0 net/unix/af_unix.c:1036 __sock_create+0x33c/0x6e0 net/socket.c:1571 sock_create net/socket.c:1622 [inline] __sys_socketpair+0x245/0x5f0 net/socket.c:1773 __do_sys_socketpair net/socket.c:1822 [inline] __se_sys_socketpair net/socket.c:1819 [inline] __x64_sys_socketpair+0x96/0xb0 net/socket.c:1819 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x95/0x180 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x6d/0x75 Freed by task 9: 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+0xee/0x1a0 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:2106 [inline] slab_free mm/slub.c:4280 [inline] kmem_cache_free+0x136/0x330 mm/slub.c:4344 sk_prot_free net/core/sock.c:2114 [inline] __sk_destruct+0x390/0x550 net/core/sock.c:2208 sock_put include/net/sock.h:1948 [inline] unix_release_sock+0x98d/0xba0 net/unix/af_unix.c:665 unix_release+0x87/0xb0 net/unix/af_unix.c:1051 __sock_release net/socket.c:659 [inline] sock_close+0xb4/0x220 net/socket.c:1421 __fput+0x301/0x670 fs/file_table.c:422 delayed_fput+0x3f/0x70 fs/file_table.c:445 process_one_work kernel/workqueue.c:3254 [inline] process_scheduled_works+0x8b6/0x12f0 kernel/workqueue.c:3335 worker_thread+0x869/0xca0 kernel/workqueue.c:3416 kthread+0x268/0x2c0 kernel/kthread.c:388 ret_from_fork+0x32/0x60 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 ffff888112144000 which belongs to the cache UNIX of size 1920 The buggy address is located 1584 bytes inside of freed 1920-byte region [ffff888112144000, ffff888112144780) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x112140 head: order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff8881077b4701 flags: 0x200000000000840(slab|head|node=0|zone=2) page_type: 0xffffffff() raw: 0200000000000840 ffff888101e8e780 dead000000000100 dead000000000122 raw: 0000000000000000 0000000080100010 00000001ffffffff ffff8881077b4701 head: 0200000000000840 ffff888101e8e780 dead000000000100 dead000000000122 head: 0000000000000000 0000000080100010 00000001ffffffff ffff8881077b4701 head: 0200000000000003 ffffea0004485001 ffffea0004485048 00000000ffffffff head: 0000000800000000 0000000000000000 00000000ffffffff 0000000000000000 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 2381, tgid 2380 (syz-executor.0), ts 56726001357, free_ts 56721450037 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x10f/0x130 mm/page_alloc.c:1534 prep_new_page mm/page_alloc.c:1541 [inline] get_page_from_freelist+0x32cd/0x36a0 mm/page_alloc.c:3317 __alloc_pages+0x256/0x670 mm/page_alloc.c:4575 __alloc_pages_node include/linux/gfp.h:238 [inline] alloc_pages_node include/linux/gfp.h:261 [inline] alloc_slab_page+0x5f/0x160 mm/slub.c:2175 allocate_slab mm/slub.c:2338 [inline] new_slab+0x70/0x270 mm/slub.c:2391 ___slab_alloc+0xb0d/0x1040 mm/slub.c:3525 __slab_alloc mm/slub.c:3610 [inline] __slab_alloc_node mm/slub.c:3663 [inline] slab_alloc_node mm/slub.c:3835 [inline] kmem_cache_alloc+0x23a/0x390 mm/slub.c:3852 sk_prot_alloc+0x52/0x1c0 net/core/sock.c:2074 sk_alloc+0x35/0x560 net/core/sock.c:2133 unix_create1+0x8c/0x730 unix_create+0x114/0x1d0 net/unix/af_unix.c:1036 __sock_create+0x33c/0x6e0 net/socket.c:1571 sock_create net/socket.c:1622 [inline] __sys_socketpair+0x1d5/0x5f0 net/socket.c:1769 __do_sys_socketpair net/socket.c:1822 [inline] __se_sys_socketpair net/socket.c:1819 [inline] __x64_sys_socketpair+0x96/0xb0 net/socket.c:1819 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x95/0x180 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x6d/0x75 page last free pid 1415 tgid 1415 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1141 [inline] free_unref_page_prepare+0x7ce/0x8f0 mm/page_alloc.c:2347 free_unref_page+0x34/0x230 mm/page_alloc.c:2487 discard_slab mm/slub.c:2437 [inline] __put_partials+0x18e/0x1d0 mm/slub.c:2906 put_cpu_partial+0x151/0x1b0 mm/slub.c:2981 __slab_free+0x2b8/0x3a0 mm/slub.c:4151 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x5e/0xc0 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:322 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3798 [inline] slab_alloc_node mm/slub.c:3845 [inline] kmem_cache_alloc+0x15f/0x390 mm/slub.c:3852 getname_flags+0xa1/0x440 fs/namei.c:139 vfs_fstatat+0x65/0xa0 fs/stat.c:303 __do_sys_newfstatat fs/stat.c:468 [inline] __se_sys_newfstatat+0xc5/0x750 fs/stat.c:462 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x95/0x180 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x6d/0x75 Memory state around the buggy address: ffff888112144500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888112144580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888112144600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888112144680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888112144700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 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