================================================================== 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:779 [inline] BUG: KASAN: slab-use-after-free in sco_sock_timeout+0x8b/0x270 net/bluetooth/sco.c:92 Write of size 4 at addr ffff888032846080 by task kworker/1:1/58 CPU: 1 UID: 0 PID: 58 Comm: kworker/1:1 Not tainted 6.11.0-rc5-syzkaller-00154-g9b0874286768 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Workqueue: events sco_sock_timeout Call Trace: __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119 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:779 [inline] sco_sock_timeout+0x8b/0x270 net/bluetooth/sco.c:92 process_one_work kernel/workqueue.c:3231 [inline] process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312 worker_thread+0x86d/0xd10 kernel/workqueue.c:3389 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 7436: 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:4158 [inline] __kmalloc_node_track_caller_noprof+0x225/0x440 mm/slub.c:4177 kmalloc_reserve+0x111/0x2a0 net/core/skbuff.c:605 pskb_expand_head+0x202/0x1390 net/core/skbuff.c:2259 __bpf_try_make_writable net/core/filter.c:1676 [inline] bpf_try_make_writable net/core/filter.c:1682 [inline] bpf_try_make_head_writable net/core/filter.c:1690 [inline] ____bpf_clone_redirect net/core/filter.c:2468 [inline] bpf_clone_redirect+0x132/0x3d0 net/core/filter.c:2446 0xffffffffa0002072 bpf_dispatcher_nop_func include/linux/bpf.h:1243 [inline] __bpf_prog_run include/linux/filter.h:691 [inline] bpf_prog_run include/linux/filter.h:698 [inline] bpf_test_run+0x4f0/0xa90 net/bpf/test_run.c:433 bpf_prog_test_run_skb+0xc97/0x1820 net/bpf/test_run.c:1094 bpf_prog_test_run+0x33a/0x3b0 kernel/bpf/syscall.c:4313 __sys_bpf+0x48d/0x810 kernel/bpf/syscall.c:5728 __do_sys_bpf kernel/bpf/syscall.c:5817 [inline] __se_sys_bpf kernel/bpf/syscall.c:5815 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5815 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 7436: 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:2252 [inline] slab_free mm/slub.c:4473 [inline] kfree+0x149/0x360 mm/slub.c:4594 skb_kfree_head net/core/skbuff.c:1084 [inline] skb_free_head net/core/skbuff.c:1096 [inline] skb_release_data+0x676/0x880 net/core/skbuff.c:1123 skb_release_all net/core/skbuff.c:1188 [inline] __kfree_skb net/core/skbuff.c:1202 [inline] sk_skb_reason_drop+0x1a5/0x3d0 net/core/skbuff.c:1240 kfree_skb_reason include/linux/skbuff.h:1260 [inline] kfree_skb include/linux/skbuff.h:1269 [inline] vti6_tnl_xmit+0x143b/0x1bd0 net/ipv6/ip6_vti.c:589 __netdev_start_xmit include/linux/netdevice.h:4913 [inline] netdev_start_xmit include/linux/netdevice.h:4922 [inline] xmit_one net/core/dev.c:3580 [inline] dev_hard_start_xmit+0x27a/0x7e0 net/core/dev.c:3596 __dev_queue_xmit+0x1b63/0x3e90 net/core/dev.c:4423 dev_queue_xmit include/linux/netdevice.h:3105 [inline] __bpf_tx_skb+0x18e/0x260 net/core/filter.c:2151 ____bpf_clone_redirect net/core/filter.c:2474 [inline] bpf_clone_redirect+0x26f/0x3d0 net/core/filter.c:2446 0xffffffffa0002072 bpf_dispatcher_nop_func include/linux/bpf.h:1243 [inline] __bpf_prog_run include/linux/filter.h:691 [inline] bpf_prog_run include/linux/filter.h:698 [inline] bpf_test_run+0x4f0/0xa90 net/bpf/test_run.c:433 bpf_prog_test_run_skb+0xc97/0x1820 net/bpf/test_run.c:1094 bpf_prog_test_run+0x33a/0x3b0 kernel/bpf/syscall.c:4313 __sys_bpf+0x48d/0x810 kernel/bpf/syscall.c:5728 __do_sys_bpf kernel/bpf/syscall.c:5817 [inline] __se_sys_bpf kernel/bpf/syscall.c:5815 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5815 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 ffff888032846000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 128 bytes inside of freed 2048-byte region [ffff888032846000, ffff888032846800) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888032844000 pfn:0x32840 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xfdffffff(slab) raw: 00fff00000000240 ffff88801ac42000 ffffea0001f24a10 ffffea00006b4210 raw: ffff888032844000 0000000000080003 00000001fdffffff 0000000000000000 head: 00fff00000000240 ffff88801ac42000 ffffea0001f24a10 ffffea00006b4210 head: ffff888032844000 0000000000080003 00000001fdffffff 0000000000000000 head: 00fff00000000003 ffffea0000ca1001 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 14141229117, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1493 prep_new_page mm/page_alloc.c:1501 [inline] get_page_from_freelist+0x2e4c/0x2f10 mm/page_alloc.c:3439 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4695 __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:2321 allocate_slab+0x5a/0x2f0 mm/slub.c:2484 new_slab mm/slub.c:2537 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3723 __slab_alloc+0x58/0xa0 mm/slub.c:3813 __slab_alloc_node mm/slub.c:3866 [inline] slab_alloc_node mm/slub.c:4025 [inline] __do_kmalloc_node mm/slub.c:4157 [inline] __kmalloc_node_track_caller_noprof+0x281/0x440 mm/slub.c:4177 __do_krealloc mm/slab_common.c:1280 [inline] krealloc_noprof+0x7d/0x120 mm/slab_common.c:1313 add_sysfs_param+0xca/0x7f0 kernel/params.c:654 kernel_add_sysfs_param+0xb4/0x130 kernel/params.c:817 param_sysfs_builtin+0x16e/0x1f0 kernel/params.c:856 param_sysfs_builtin_init+0x31/0x40 kernel/params.c:990 do_one_initcall+0x248/0x880 init/main.c:1267 do_initcall_level+0x157/0x210 init/main.c:1329 do_initcalls+0x3f/0x80 init/main.c:1345 page_owner free stack trace missing Memory state around the buggy address: ffff888032845f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888032846000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888032846080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888032846100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888032846180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================