================================================================== 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+0x8b/0x270 net/bluetooth/sco.c:92 Write of size 4 at addr ffff888025bc6080 by task kworker/0:8/9002 CPU: 0 PID: 9002 Comm: kworker/0:8 Not tainted 6.10.0-rc2-syzkaller-00010-g2ab795141095 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 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+0x8b/0x270 net/bluetooth/sco.c:92 process_one_work kernel/workqueue.c:3231 [inline] process_scheduled_works+0xa2e/0x1830 kernel/workqueue.c:3312 worker_thread+0x86d/0xd70 kernel/workqueue.c:3393 kthread+0x2f2/0x390 kernel/kthread.c:389 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Allocated by task 16856: 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/0x2c0 mm/slub.c:4152 kmalloc_noprof include/linux/slab.h:660 [inline] kzalloc_noprof include/linux/slab.h:778 [inline] do_check_common+0x190/0x1dd0 kernel/bpf/verifier.c:20745 do_check_main kernel/bpf/verifier.c:20930 [inline] bpf_check+0x14222/0x192f0 kernel/bpf/verifier.c:21600 bpf_prog_load+0x1667/0x20f0 kernel/bpf/syscall.c:2908 __sys_bpf+0x4ee/0x810 kernel/bpf/syscall.c:5687 __do_sys_bpf kernel/bpf/syscall.c:5794 [inline] __se_sys_bpf kernel/bpf/syscall.c:5792 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5792 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 16856: 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:2195 [inline] slab_free mm/slub.c:4436 [inline] kfree+0x149/0x360 mm/slub.c:4557 free_func_state kernel/bpf/verifier.c:1376 [inline] free_verifier_state+0xde/0x240 kernel/bpf/verifier.c:1392 do_check_common+0x14f5/0x1dd0 kernel/bpf/verifier.c:20845 do_check_main kernel/bpf/verifier.c:20930 [inline] bpf_check+0x14222/0x192f0 kernel/bpf/verifier.c:21600 bpf_prog_load+0x1667/0x20f0 kernel/bpf/syscall.c:2908 __sys_bpf+0x4ee/0x810 kernel/bpf/syscall.c:5687 __do_sys_bpf kernel/bpf/syscall.c:5794 [inline] __se_sys_bpf kernel/bpf/syscall.c:5792 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5792 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888025bc6000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 128 bytes inside of freed 2048-byte region [ffff888025bc6000, ffff888025bc6800) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x25bc0 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 anon flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffefff(slab) raw: 00fff00000000040 ffff888015042000 0000000000000000 dead000000000001 raw: 0000000000000000 0000000000080008 00000001ffffefff 0000000000000000 head: 00fff00000000040 ffff888015042000 0000000000000000 dead000000000001 head: 0000000000000000 0000000000080008 00000001ffffefff 0000000000000000 head: 00fff00000000003 ffffea000096f001 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 0x1d28c0(GFP_NOWAIT|__GFP_IO|__GFP_FS|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 10412, tgid 10412 (syz-executor.2), ts 372275740459, free_ts 371891779709 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1468 prep_new_page mm/page_alloc.c:1476 [inline] get_page_from_freelist+0x2e2d/0x2ee0 mm/page_alloc.c:3402 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4660 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] alloc_slab_page+0x5f/0x120 mm/slub.c:2264 allocate_slab+0x5a/0x2e0 mm/slub.c:2427 new_slab mm/slub.c:2480 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3666 __slab_alloc+0x58/0xa0 mm/slub.c:3756 __slab_alloc_node mm/slub.c:3809 [inline] slab_alloc_node mm/slub.c:3988 [inline] __do_kmalloc_node mm/slub.c:4120 [inline] kmalloc_node_track_caller_noprof+0x281/0x440 mm/slub.c:4141 kmalloc_reserve+0x111/0x2a0 net/core/skbuff.c:597 pskb_expand_head+0x202/0x1390 net/core/skbuff.c:2240 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:1125 [inline] nlmsg_multicast include/net/netlink.h:1144 [inline] nlmsg_notify+0xfb/0x1c0 net/netlink/af_netlink.c:2607 rtnl_notify net/core/rtnetlink.c:757 [inline] rtmsg_ifinfo_send net/core/rtnetlink.c:4094 [inline] rtmsg_ifinfo_event net/core/rtnetlink.c:4110 [inline] rtnetlink_event+0x21d/0x260 net/core/rtnetlink.c:6646 notifier_call_chain+0x1a1/0x3e0 kernel/notifier.c:93 __netdev_upper_dev_link+0x4c3/0x670 net/core/dev.c:7887 page last free pid 10431 tgid 10431 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1088 [inline] free_unref_page+0xd22/0xea0 mm/page_alloc.c:2565 discard_slab mm/slub.c:2526 [inline] __put_partials+0xeb/0x130 mm/slub.c:2994 put_cpu_partial+0x17c/0x250 mm/slub.c:3069 __slab_free+0x2ea/0x3d0 mm/slub.c:4306 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:3940 [inline] slab_alloc_node mm/slub.c:4000 [inline] kmalloc_trace_noprof+0x132/0x2c0 mm/slub.c:4147 kmalloc_noprof include/linux/slab.h:660 [inline] kzalloc_noprof include/linux/slab.h:778 [inline] ref_tracker_alloc+0x14b/0x490 lib/ref_tracker.c:203 register_netdevice+0x1408/0x19e0 net/core/dev.c:10394 veth_newlink+0x628/0xcd0 drivers/net/veth.c:1829 rtnl_newlink_create net/core/rtnetlink.c:3510 [inline] __rtnl_newlink net/core/rtnetlink.c:3730 [inline] rtnl_newlink+0x1591/0x20a0 net/core/rtnetlink.c:3743 rtnetlink_rcv_msg+0x89d/0x10d0 net/core/rtnetlink.c:6595 netlink_rcv_skb+0x1e5/0x430 net/netlink/af_netlink.c:2564 netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline] netlink_unicast+0x7ec/0x980 net/netlink/af_netlink.c:1361 netlink_sendmsg+0x8db/0xcb0 net/netlink/af_netlink.c:1905 Memory state around the buggy address: ffff888025bc5f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888025bc6000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888025bc6080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888025bc6100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888025bc6180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================