================================================================== 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:165 [inline] BUG: KASAN: slab-use-after-free in unix_del_edges+0x148/0x630 net/unix/garbage.c:237 Read of size 8 at addr ffff888062536e40 by task kworker/u8:4/62 CPU: 1 PID: 62 Comm: kworker/u8:4 Not tainted 6.9.0-rc4-next-20240418-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+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 unix_edge_successor net/unix/garbage.c:109 [inline] unix_del_edge net/unix/garbage.c:165 [inline] unix_del_edges+0x148/0x630 net/unix/garbage.c:237 unix_destroy_fpl+0x59/0x210 net/unix/garbage.c:298 unix_detach_fds net/unix/af_unix.c:1811 [inline] unix_destruct_scm+0x13e/0x210 net/unix/af_unix.c:1826 skb_release_head_state+0x100/0x250 net/core/skbuff.c:1127 skb_release_all net/core/skbuff.c:1138 [inline] __kfree_skb net/core/skbuff.c:1154 [inline] kfree_skb_reason+0x16d/0x3b0 net/core/skbuff.c:1190 __skb_queue_purge_reason include/linux/skbuff.h:3251 [inline] __skb_queue_purge include/linux/skbuff.h:3256 [inline] __unix_gc+0x1732/0x1830 net/unix/garbage.c:575 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:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Allocated by task 10111: 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:3897 [inline] slab_alloc_node mm/slub.c:3957 [inline] kmem_cache_alloc_noprof+0x135/0x290 mm/slub.c:3964 sk_prot_alloc+0x58/0x210 net/core/sock.c:2074 sk_alloc+0x38/0x370 net/core/sock.c:2133 unix_create1+0xb4/0x770 unix_create+0x14e/0x200 net/unix/af_unix.c:1034 __sock_create+0x490/0x920 net/socket.c:1571 sock_create net/socket.c:1622 [inline] __sys_socketpair+0x33e/0x720 net/socket.c:1773 __do_sys_socketpair net/socket.c:1822 [inline] __se_sys_socketpair net/socket.c:1819 [inline] __x64_sys_socketpair+0x9b/0xb0 net/socket.c:1819 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 5157: 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:2190 [inline] slab_free mm/slub.c:4393 [inline] kmem_cache_free+0x145/0x340 mm/slub.c:4468 sk_prot_free net/core/sock.c:2114 [inline] __sk_destruct+0x467/0x5f0 net/core/sock.c:2208 sock_put include/net/sock.h:1948 [inline] unix_release_sock+0xa8b/0xd20 net/unix/af_unix.c:665 unix_release+0x91/0xc0 net/unix/af_unix.c:1049 __sock_release net/socket.c:659 [inline] sock_close+0xbc/0x240 net/socket.c:1421 __fput+0x406/0x8b0 fs/file_table.c:422 delayed_fput+0x59/0x80 fs/file_table.c:445 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:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 The buggy address belongs to the object at ffff888062536800 which belongs to the cache UNIX of size 1920 The buggy address is located 1600 bytes inside of freed 1920-byte region [ffff888062536800, ffff888062536f80) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x62530 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff8880235a4501 flags: 0xfff80000000040(head|node=0|zone=1|lastcpupid=0xfff) page_type: 0xffffefff(slab) raw: 00fff80000000040 ffff8880177cb3c0 ffffea0001f32400 0000000000000002 raw: 0000000000000000 0000000080100010 00000001ffffefff ffff8880235a4501 head: 00fff80000000040 ffff8880177cb3c0 ffffea0001f32400 0000000000000002 head: 0000000000000000 0000000080100010 00000001ffffefff ffff8880235a4501 head: 00fff80000000003 ffffea0001894c01 ffffffffffffffff 0000000000000000 head: 0000000000000008 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 7369, tgid -1730756757 (syz-executor.3), ts 7369, free_ts 204371224637 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1476 prep_new_page mm/page_alloc.c:1484 [inline] get_page_from_freelist+0x2ce2/0x2d90 mm/page_alloc.c:3446 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4704 __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:2259 allocate_slab+0x5a/0x2e0 mm/slub.c:2422 new_slab mm/slub.c:2475 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3624 __slab_alloc+0x58/0xa0 mm/slub.c:3714 __slab_alloc_node mm/slub.c:3767 [inline] slab_alloc_node mm/slub.c:3945 [inline] kmem_cache_alloc_noprof+0x1c1/0x290 mm/slub.c:3964 sk_prot_alloc+0x58/0x210 net/core/sock.c:2074 sk_alloc+0x38/0x370 net/core/sock.c:2133 unix_create1+0xb4/0x770 unix_create+0x14e/0x200 net/unix/af_unix.c:1034 __sock_create+0x490/0x920 net/socket.c:1571 sock_create net/socket.c:1622 [inline] __sys_socket_create net/socket.c:1659 [inline] __sys_socket+0x150/0x3c0 net/socket.c:1706 __do_sys_socket net/socket.c:1720 [inline] __se_sys_socket net/socket.c:1718 [inline] __x64_sys_socket+0x7a/0x90 net/socket.c:1718 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 page last free pid 4533 tgid 4533 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1096 [inline] free_unref_page+0xd22/0xea0 mm/page_alloc.c:2609 discard_slab mm/slub.c:2521 [inline] __put_partials+0xeb/0x130 mm/slub.c:2989 put_cpu_partial+0x17c/0x250 mm/slub.c:3064 __slab_free+0x2ea/0x3d0 mm/slub.c:4263 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9e/0x140 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:3897 [inline] slab_alloc_node mm/slub.c:3957 [inline] kmem_cache_alloc_node_noprof+0x16b/0x310 mm/slub.c:4000 __alloc_skb+0x1c3/0x440 net/core/skbuff.c:659 alloc_skb include/linux/skbuff.h:1313 [inline] alloc_skb_with_frags+0xc3/0x770 net/core/skbuff.c:6446 sock_alloc_send_pskb+0x91a/0xa60 net/core/sock.c:2794 unix_dgram_sendmsg+0x6d3/0x1f80 net/unix/af_unix.c:1973 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:745 __sys_sendto+0x3a4/0x4f0 net/socket.c:2191 __do_sys_sendto net/socket.c:2203 [inline] __se_sys_sendto net/socket.c:2199 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2199 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 Memory state around the buggy address: ffff888062536d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888062536d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888062536e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888062536e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888062536f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================