================================================================== 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:182 [inline] BUG: KASAN: slab-use-after-free in __refcount_inc include/linux/refcount.h:239 [inline] BUG: KASAN: slab-use-after-free in refcount_inc include/linux/refcount.h:256 [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 ffff888021ebc080 by task kworker/1:5/5160 CPU: 1 PID: 5160 Comm: kworker/1:5 Not tainted 6.8.0-rc7-syzkaller-02088-g15d2540e0d62 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024 Workqueue: events sco_sock_timeout Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:377 [inline] print_report+0x167/0x540 mm/kasan/report.c:488 kasan_report+0x142/0x180 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:182 [inline] __refcount_inc include/linux/refcount.h:239 [inline] refcount_inc include/linux/refcount.h:256 [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:2633 [inline] process_scheduled_works+0x913/0x1420 kernel/workqueue.c:2706 worker_thread+0xa5f/0x1000 kernel/workqueue.c:2787 kthread+0x2ef/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243 Allocated by task 4517: 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+0x1d6/0x360 mm/slub.c:4012 kmalloc include/linux/slab.h:590 [inline] syslog_print+0x121/0x9c0 kernel/printk/printk.c:1550 do_syslog+0x509/0x890 kernel/printk/printk.c:1728 __do_sys_syslog kernel/printk/printk.c:1820 [inline] __se_sys_syslog kernel/printk/printk.c:1818 [inline] __x64_sys_syslog+0x7c/0x90 kernel/printk/printk.c:1818 do_syscall_64+0xf9/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 Freed by task 4517: 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:589 poison_slab_object+0xa6/0xe0 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:2121 [inline] slab_free mm/slub.c:4299 [inline] kfree+0x14a/0x380 mm/slub.c:4409 syslog_print+0x91d/0x9c0 kernel/printk/printk.c:1642 do_syslog+0x509/0x890 kernel/printk/printk.c:1728 __do_sys_syslog kernel/printk/printk.c:1820 [inline] __se_sys_syslog kernel/printk/printk.c:1818 [inline] __x64_sys_syslog+0x7c/0x90 kernel/printk/printk.c:1818 do_syscall_64+0xf9/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 The buggy address belongs to the object at ffff888021ebc000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 128 bytes inside of freed 2048-byte region [ffff888021ebc000, ffff888021ebc800) The buggy address belongs to the physical page: page:ffffea000087ae00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888021ebe000 pfn:0x21eb8 head:ffffea000087ae00 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000a40(workingset|slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000a40 ffff888014c42000 ffffea0001081810 ffffea0000e89610 raw: ffff888021ebe000 0000000000080004 00000001ffffffff 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 5838, tgid 5838 (syz-executor.4), ts 228581520035, free_ts 221683267152 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1ea/0x210 mm/page_alloc.c:1533 prep_new_page mm/page_alloc.c:1540 [inline] get_page_from_freelist+0x33ea/0x3580 mm/page_alloc.c:3311 __alloc_pages+0x255/0x680 mm/page_alloc.c:4567 __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:2190 allocate_slab mm/slub.c:2354 [inline] new_slab+0x84/0x2f0 mm/slub.c:2407 ___slab_alloc+0xd17/0x13e0 mm/slub.c:3540 __slab_alloc mm/slub.c:3625 [inline] __slab_alloc_node mm/slub.c:3678 [inline] slab_alloc_node mm/slub.c:3850 [inline] __do_kmalloc_node mm/slub.c:3980 [inline] __kmalloc_node_track_caller+0x2d1/0x4e0 mm/slub.c:4001 kmalloc_reserve+0xf3/0x260 net/core/skbuff.c:603 pskb_expand_head+0x202/0x1350 net/core/skbuff.c:2251 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:2599 rtnl_notify net/core/rtnetlink.c:757 [inline] rtmsg_ifinfo_send net/core/rtnetlink.c:4081 [inline] rtmsg_ifinfo_event net/core/rtnetlink.c:4097 [inline] rtnetlink_event+0x21d/0x260 net/core/rtnetlink.c:6649 notifier_call_chain+0x18f/0x3b0 kernel/notifier.c:93 call_netdevice_notifiers_extack net/core/dev.c:1988 [inline] call_netdevice_notifiers net/core/dev.c:2002 [inline] dev_set_mac_address+0x3d9/0x510 net/core/dev.c:8959 dev_set_mac_address_user+0x31/0x50 net/core/dev.c:8973 page last free pid 5106 tgid 5106 stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1140 [inline] free_unref_page_prepare+0x968/0xa90 mm/page_alloc.c:2346 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2486 __slab_free+0x349/0x410 mm/slub.c:4211 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_kmalloc+0x23/0xb0 mm/kasan/common.c:378 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slub.c:3981 [inline] __kmalloc+0x22e/0x490 mm/slub.c:3994 kmalloc include/linux/slab.h:594 [inline] kzalloc include/linux/slab.h:711 [inline] lsm_cred_alloc security/security.c:614 [inline] security_prepare_creds+0x4c/0x140 security/security.c:3047 prepare_creds+0x466/0x640 kernel/cred.c:242 copy_creds+0x109/0x9c0 kernel/cred.c:312 copy_process+0x9a8/0x3fc0 kernel/fork.c:2361 kernel_clone+0x21d/0x8d0 kernel/fork.c:2902 __do_sys_clone kernel/fork.c:3045 [inline] __se_sys_clone kernel/fork.c:3029 [inline] __x64_sys_clone+0x258/0x2a0 kernel/fork.c:3029 do_syscall_64+0xf9/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 Memory state around the buggy address: ffff888021ebbf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888021ebc000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888021ebc080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888021ebc100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888021ebc180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================