================================================================== BUG: KASAN: slab-use-after-free in instrument_atomic_read_write include/linux/instrumented.h:96 [inline] BUG: KASAN: slab-use-after-free in atomic_fetch_add_relaxed include/linux/atomic/atomic-instrumented.h:252 [inline] BUG: KASAN: slab-use-after-free in __refcount_add include/linux/refcount.h:184 [inline] BUG: KASAN: slab-use-after-free in __refcount_inc include/linux/refcount.h:241 [inline] BUG: KASAN: slab-use-after-free in refcount_inc include/linux/refcount.h:258 [inline] BUG: KASAN: slab-use-after-free in sock_hold include/net/sock.h:774 [inline] BUG: KASAN: slab-use-after-free in sco_sock_timeout+0x67/0x240 net/bluetooth/sco.c:88 Write of size 4 at addr ffff88802a70c080 by task kworker/1:0/24 CPU: 1 PID: 24 Comm: kworker/1:0 Not tainted 6.9.0-rc1-next-20240328-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Workqueue: events sco_sock_timeout 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 kasan_check_range+0x282/0x290 mm/kasan/generic.c:189 instrument_atomic_read_write include/linux/instrumented.h:96 [inline] atomic_fetch_add_relaxed include/linux/atomic/atomic-instrumented.h:252 [inline] __refcount_add include/linux/refcount.h:184 [inline] __refcount_inc include/linux/refcount.h:241 [inline] refcount_inc include/linux/refcount.h:258 [inline] sock_hold include/net/sock.h:774 [inline] sco_sock_timeout+0x67/0x240 net/bluetooth/sco.c:88 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 Allocated by task 6642: 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] __do_kmalloc_node mm/slub.c:4048 [inline] __kmalloc_noprof+0x200/0x410 mm/slub.c:4061 kmalloc_noprof include/linux/slab.h:664 [inline] sk_prot_alloc+0xe0/0x210 net/core/sock.c:2080 sk_alloc+0x38/0x370 net/core/sock.c:2133 bt_sock_alloc+0x3c/0x340 net/bluetooth/af_bluetooth.c:148 sco_sock_alloc net/bluetooth/sco.c:496 [inline] sco_sock_create+0xbb/0x390 net/bluetooth/sco.c:527 bt_sock_create+0x161/0x230 net/bluetooth/af_bluetooth.c:132 __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_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 Freed by task 6642: 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:4363 [inline] kfree+0x149/0x350 mm/slub.c:4484 sk_prot_free net/core/sock.c:2116 [inline] __sk_destruct+0x476/0x5f0 net/core/sock.c:2208 sco_sock_release+0x25e/0x320 net/bluetooth/sco.c:1257 __sock_release net/socket.c:659 [inline] sock_close+0xbc/0x240 net/socket.c:1421 __fput+0x429/0x8a0 fs/file_table.c:422 task_work_run+0x24f/0x310 kernel/task_work.c:180 get_signal+0x15e6/0x1740 kernel/signal.c:2683 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:111 [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+0xc9/0x360 kernel/entry/common.c:218 do_syscall_64+0x10a/0x240 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x6d/0x75 The buggy address belongs to the object at ffff88802a70c000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 128 bytes inside of freed 2048-byte region [ffff88802a70c000, ffff88802a70c800) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88802a70c000 pfn:0x2a708 head: order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff80000000240(workingset|head|node=0|zone=1|lastcpupid=0xfff) page_type: 0xffffefff(slab) raw: 00fff80000000240 ffff888015042000 ffffea000095f010 ffffea0000873e10 raw: ffff88802a70c000 0000000000080001 00000001ffffefff 0000000000000000 head: 00fff80000000240 ffff888015042000 ffffea000095f010 ffffea0000873e10 head: ffff88802a70c000 0000000000080001 00000001ffffefff 0000000000000000 head: 00fff80000000003 ffffea0000a9c201 ffffea0000a9c248 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 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5096, tgid -389426193 (syz-executor.4), ts 5096, free_ts 59687096919 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1487 prep_new_page mm/page_alloc.c:1495 [inline] get_page_from_freelist+0x2e8a/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+0xea8/0x1430 mm/slub.c:3599 __slab_alloc+0x58/0xa0 mm/slub.c:3684 __slab_alloc_node mm/slub.c:3737 [inline] slab_alloc_node mm/slub.c:3915 [inline] __do_kmalloc_node mm/slub.c:4047 [inline] kmalloc_node_track_caller_noprof+0x286/0x450 mm/slub.c:4068 kmalloc_reserve+0x111/0x2a0 net/core/skbuff.c:599 pskb_expand_head+0x202/0x1390 net/core/skbuff.c:2245 netlink_trim+0x183/0x220 net/netlink/af_netlink.c:1317 netlink_broadcast_filtered+0x76/0x1290 net/netlink/af_netlink.c:1523 nlmsg_multicast_filtered include/net/netlink.h:1111 [inline] nlmsg_multicast include/net/netlink.h:1130 [inline] nlmsg_notify+0xfb/0x1c0 net/netlink/af_netlink.c:2602 __dev_notify_flags+0xf7/0x400 net/core/dev.c:8769 rtnl_newlink_create net/core/rtnetlink.c:3502 [inline] __rtnl_newlink net/core/rtnetlink.c:3714 [inline] rtnl_newlink+0x1a43/0x20a0 net/core/rtnetlink.c:3727 rtnetlink_rcv_msg+0x89b/0x10d0 net/core/rtnetlink.c:6595 page last free pid 5089 tgid 5089 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:4233 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:3867 [inline] slab_alloc_node mm/slub.c:3927 [inline] kmem_cache_alloc_node_noprof+0x16b/0x310 mm/slub.c:3970 __alloc_skb+0x1c3/0x440 net/core/skbuff.c:658 alloc_skb include/linux/skbuff.h:1318 [inline] nlmsg_new include/net/netlink.h:1010 [inline] netlink_ack+0x399/0x12b0 net/netlink/af_netlink.c:2496 netlink_rcv_skb+0x262/0x430 net/netlink/af_netlink.c:2565 netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline] netlink_unicast+0x7ea/0x980 net/netlink/af_netlink.c:1361 netlink_sendmsg+0x8e1/0xcb0 net/netlink/af_netlink.c:1905 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 Memory state around the buggy address: ffff88802a70bf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802a70c000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88802a70c080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802a70c100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802a70c180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================