IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready 8021q: adding VLAN 0 to HW filter on device batadv0 8021q: adding VLAN 0 to HW filter on device batadv0 ================================================================== BUG: KASAN: use-after-free in __list_del_entry_valid+0xe6/0xf5 lib/list_debug.c:51 Read of size 8 at addr ffff888094c06128 by task syz-executor1/8772 CPU: 0 PID: 8772 Comm: syz-executor1 Not tainted 4.20.0+ #2 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1db/0x2d0 lib/dump_stack.c:113 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report mm/kasan/report.c:412 [inline] kasan_report.cold+0x8c/0x2ba mm/kasan/report.c:396 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 __list_del_entry_valid+0xe6/0xf5 lib/list_debug.c:51 __list_del_entry include/linux/list.h:117 [inline] list_del_rcu include/linux/rculist.h:130 [inline] bpf_prog_ksym_node_del kernel/bpf/core.c:589 [inline] bpf_prog_kallsyms_del kernel/bpf/core.c:620 [inline] bpf_prog_kallsyms_del+0x1d7/0x400 kernel/bpf/core.c:614 bpf_prog_kallsyms_del_subprogs+0xd6/0x170 kernel/bpf/core.c:467 bpf_prog_kallsyms_del_all+0x16/0x30 kernel/bpf/core.c:472 __bpf_prog_put kernel/bpf/syscall.c:1216 [inline] __bpf_prog_put+0xe7/0x220 kernel/bpf/syscall.c:1211 bpf_prog_put kernel/bpf/syscall.c:1227 [inline] bpf_prog_release+0x3c/0x50 kernel/bpf/syscall.c:1235 __fput+0x3c5/0xaf0 fs/file_table.c:278 ____fput+0x16/0x20 fs/file_table.c:309 task_work_run+0x1f4/0x2b0 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x1a52/0x26f0 kernel/exit.c:867 do_group_exit+0x177/0x430 kernel/exit.c:970 get_signal+0x8b4/0x19b0 kernel/signal.c:2517 do_signal+0x91/0x1e80 arch/x86/kernel/signal.c:816 exit_to_usermode_loop+0x2f7/0x3b0 arch/x86/entry/common.c:162 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x696/0x800 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457ec9 Code: 6d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ff305ecec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: 0000000000000003 RBX: 0000000000000003 RCX: 0000000000457ec9 RDX: 0000000000000048 RSI: 0000000020000000 RDI: 0000000000000005 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff305ecf6d4 R13: 00000000004be236 R14: 00000000004ce360 R15: 00000000ffffffff Allocated by task 8776: save_stack+0x45/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc mm/kasan/kasan.c:553 [inline] kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:531 kmem_cache_alloc_trace+0x152/0x760 mm/slab.c:3620 kmalloc include/linux/slab.h:546 [inline] kzalloc include/linux/slab.h:741 [inline] bpf_prog_alloc+0x14a/0x390 kernel/bpf/core.c:91 bpf_prog_load+0x52e/0x1d00 kernel/bpf/syscall.c:1486 __do_sys_bpf+0xc52/0x4410 kernel/bpf/syscall.c:2618 __se_sys_bpf kernel/bpf/syscall.c:2580 [inline] __x64_sys_bpf+0x73/0xb0 kernel/bpf/syscall.c:2580 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 8111: save_stack+0x45/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xcf/0x230 mm/slab.c:3817 __bpf_prog_free kernel/bpf/core.c:233 [inline] bpf_prog_unlock_free include/linux/filter.h:743 [inline] bpf_prog_free_deferred kernel/bpf/core.c:1970 [inline] bpf_prog_free_deferred+0x294/0x410 kernel/bpf/core.c:1954 process_one_work+0xd0c/0x1ce0 kernel/workqueue.c:2153 worker_thread+0x143/0x14a0 kernel/workqueue.c:2296 kthread+0x357/0x430 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 The buggy address belongs to the object at ffff888094c060c0 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 104 bytes inside of 512-byte region [ffff888094c060c0, ffff888094c062c0) The buggy address belongs to the page: page:ffffea0002530180 count:1 mapcount:0 mapping:ffff88812c3f0940 index:0x0 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea000253d0c8 ffffea0002539f88 ffff88812c3f0940 raw: 0000000000000000 ffff888094c060c0 0000000100000006 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888094c06000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888094c06080: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb >ffff888094c06100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888094c06180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888094c06200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================