================================================================== BUG: KASAN: use-after-free in __list_add_valid+0x26/0xc4 lib/list_debug.c:27 Read of size 8 at addr ff600000129b9008 by task syz-executor.1/6218 CPU: 0 PID: 6218 Comm: syz-executor.1 Tainted: G W 6.2.0-rc1-syzkaller #0 Hardware name: riscv-virtio,qemu (DT) Call Trace: [] dump_backtrace+0x2e/0x3c arch/riscv/kernel/stacktrace.c:121 [] show_stack+0x34/0x40 arch/riscv/kernel/stacktrace.c:127 [] __dump_stack lib/dump_stack.c:88 [inline] [] dump_stack_lvl+0xe0/0x14c lib/dump_stack.c:106 [] print_address_description mm/kasan/report.c:306 [inline] [] print_report+0x1e4/0x4c0 mm/kasan/report.c:417 [] kasan_report+0xb8/0xe6 mm/kasan/report.c:517 [] check_region_inline mm/kasan/generic.c:183 [inline] [] __asan_load8+0x7e/0xa6 mm/kasan/generic.c:256 [] __list_add_valid+0x26/0xc4 lib/list_debug.c:27 [] __list_add include/linux/list.h:69 [inline] [] list_add include/linux/list.h:88 [inline] [] nfc_llcp_register_device+0x476/0x4e4 net/nfc/llcp_core.c:1603 [] nfc_register_device+0x8a/0x2b2 net/nfc/core.c:1124 [] nci_register_device+0x52c/0x60a net/nfc/nci/core.c:1257 [] virtual_ncidev_open+0xf8/0x174 drivers/nfc/virtual_ncidev.c:148 [] misc_open+0x26e/0x2c6 drivers/char/misc.c:165 [] chrdev_open+0x1d4/0x478 fs/char_dev.c:414 [] do_dentry_open+0x3a6/0x914 fs/open.c:882 [] vfs_open+0x52/0x5e fs/open.c:1013 [] do_open fs/namei.c:3557 [inline] [] path_openat+0x1140/0x17b6 fs/namei.c:3714 [] do_filp_open+0x11c/0x246 fs/namei.c:3741 [] do_sys_openat2+0x174/0x31e fs/open.c:1310 [] do_sys_open fs/open.c:1326 [inline] [] __do_sys_openat fs/open.c:1342 [inline] [] sys_openat+0xdc/0x164 fs/open.c:1337 [] ret_from_syscall+0x0/0x2 Allocated by task 6189: stack_trace_save+0xa6/0xd8 kernel/stacktrace.c:122 kasan_save_stack+0x2c/0x5a mm/kasan/common.c:45 kasan_set_track+0x1a/0x26 mm/kasan/common.c:52 kasan_save_alloc_info+0x1a/0x24 mm/kasan/generic.c:507 ____kasan_kmalloc mm/kasan/common.c:371 [inline] ____kasan_kmalloc mm/kasan/common.c:330 [inline] __kasan_kmalloc+0x9c/0xa2 mm/kasan/common.c:380 kasan_kmalloc include/linux/kasan.h:211 [inline] kmalloc_trace+0x44/0x56 mm/slab_common.c:1067 kmalloc include/linux/slab.h:580 [inline] kzalloc include/linux/slab.h:720 [inline] nfc_llcp_register_device+0x48/0x4e4 net/nfc/llcp_core.c:1566 nfc_register_device+0x8a/0x2b2 net/nfc/core.c:1124 nci_register_device+0x52c/0x60a net/nfc/nci/core.c:1257 virtual_ncidev_open+0xf8/0x174 drivers/nfc/virtual_ncidev.c:148 misc_open+0x26e/0x2c6 drivers/char/misc.c:165 chrdev_open+0x1d4/0x478 fs/char_dev.c:414 do_dentry_open+0x3a6/0x914 fs/open.c:882 vfs_open+0x52/0x5e fs/open.c:1013 do_open fs/namei.c:3557 [inline] path_openat+0x1140/0x17b6 fs/namei.c:3714 do_filp_open+0x11c/0x246 fs/namei.c:3741 do_sys_openat2+0x174/0x31e fs/open.c:1310 do_sys_open fs/open.c:1326 [inline] __do_sys_openat fs/open.c:1342 [inline] sys_openat+0xdc/0x164 fs/open.c:1337 ret_from_syscall+0x0/0x2 Freed by task 6187: stack_trace_save+0xa6/0xd8 kernel/stacktrace.c:122 kasan_save_stack+0x2c/0x5a mm/kasan/common.c:45 kasan_set_track+0x1a/0x26 mm/kasan/common.c:52 kasan_save_free_info+0x2c/0x4a mm/kasan/generic.c:518 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x156/0x1a0 mm/kasan/common.c:200 __kasan_slab_free+0x10/0x18 mm/kasan/common.c:244 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1781 [inline] slab_free_freelist_hook+0x8e/0x1cc mm/slub.c:1807 slab_free mm/slub.c:3787 [inline] __kmem_cache_free+0xce/0x304 mm/slub.c:3800 kfree+0xaa/0x1d8 mm/slab_common.c:1020 local_release net/nfc/llcp_core.c:173 [inline] kref_put include/linux/kref.h:65 [inline] nfc_llcp_local_put net/nfc/llcp_core.c:181 [inline] nfc_llcp_local_put net/nfc/llcp_core.c:176 [inline] nfc_llcp_unregister_device+0x15c/0x1a4 net/nfc/llcp_core.c:1619 nfc_unregister_device+0x122/0x232 net/nfc/core.c:1179 nci_unregister_device+0x168/0x182 net/nfc/nci/core.c:1303 virtual_ncidev_close+0x38/0x6e drivers/nfc/virtual_ncidev.c:163 __fput+0x168/0x53e fs/file_table.c:320 ____fput+0x1a/0x24 fs/file_table.c:348 task_work_run+0x166/0x208 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_work_pending+0x74a/0xd88 arch/riscv/kernel/signal.c:334 resume_userspace_slow+0x8/0xa Last potentially related work creation: stack_trace_save+0xa6/0xd8 kernel/stacktrace.c:122 kasan_save_stack+0x2c/0x5a mm/kasan/common.c:45 __kasan_record_aux_stack+0xc0/0xe4 mm/kasan/generic.c:488 kasan_record_aux_stack_noalloc+0xe/0x16 mm/kasan/generic.c:498 __call_rcu_common.constprop.0+0x80/0x558 kernel/rcu/tree.c:2755 call_rcu+0xc/0x14 kernel/rcu/tree.c:2868 keypair_free_kref drivers/net/wireguard/noise.c:128 [inline] kref_put include/linux/kref.h:65 [inline] wg_noise_keypair_put+0x116/0x200 drivers/net/wireguard/noise.c:139 add_new_keypair drivers/net/wireguard/noise.c:248 [inline] wg_noise_handshake_begin_session+0x772/0x8a8 drivers/net/wireguard/noise.c:845 wg_packet_send_handshake_response+0x1bc/0x228 drivers/net/wireguard/send.c:96 wg_receive_handshake_packet+0x498/0x718 drivers/net/wireguard/receive.c:154 wg_packet_handshake_receive_worker+0x116/0x2a4 drivers/net/wireguard/receive.c:213 process_one_work+0x660/0x102e kernel/workqueue.c:2289 worker_thread+0x362/0x878 kernel/workqueue.c:2436 kthread+0x19c/0x1f8 kernel/kthread.c:376 ret_from_exception+0x0/0x1a arch/riscv/kernel/entry.S:249 The buggy address belongs to the object at ff600000129b9000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 8 bytes inside of 2048-byte region [ff600000129b9000, ff600000129b9800) The buggy address belongs to the physical page: page:ff1c0000024aee00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x92bb8 head:ff1c0000024aee00 order:3 compound_mapcount:0 subpages_mapcount:0 compound_pincount:0 flags: 0xffe000000010200(slab|head|node=0|zone=0|lastcpupid=0x7ff) raw: 0ffe000000010200 ff60000008202000 0000000000000100 0000000000000122 raw: 0000000000000000 0000000000080008 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 0x1d2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 2845, tgid 2845 (sshd), ts 1964390692700, free_ts 1963627504100 __set_page_owner+0x32/0x182 mm/page_owner.c:190 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0xf8/0x11a mm/page_alloc.c:2524 prep_new_page mm/page_alloc.c:2531 [inline] get_page_from_freelist+0xc0e/0x1118 mm/page_alloc.c:4283 __alloc_pages+0x1b0/0x165a mm/page_alloc.c:5549 alloc_pages+0x132/0x25e mm/mempolicy.c:2286 alloc_slab_page mm/slub.c:1851 [inline] allocate_slab mm/slub.c:1998 [inline] new_slab+0x270/0x382 mm/slub.c:2051 ___slab_alloc+0x57e/0xaa6 mm/slub.c:3193 __slab_alloc.constprop.0+0x5a/0x98 mm/slub.c:3292 __slab_alloc_node mm/slub.c:3345 [inline] slab_alloc_node mm/slub.c:3442 [inline] __kmem_cache_alloc_node+0xf2/0x2e4 mm/slub.c:3491 __do_kmalloc_node mm/slab_common.c:967 [inline] __kmalloc_node_track_caller+0x38/0xe6 mm/slab_common.c:988 kmalloc_reserve net/core/skbuff.c:492 [inline] pskb_expand_head+0x158/0x81a net/core/skbuff.c:1899 __pskb_pull_tail+0x98/0xa9c net/core/skbuff.c:2441 __skb_linearize include/linux/skbuff.h:3668 [inline] validate_xmit_skb+0x508/0x8b6 net/core/dev.c:3673 validate_xmit_skb_list+0x98/0xca net/core/dev.c:3714 sch_direct_xmit+0x3bc/0x464 net/sched/sch_generic.c:327 __dev_xmit_skb net/core/dev.c:3810 [inline] __dev_queue_xmit+0x109e/0x2b14 net/core/dev.c:4215 page last free stack trace: __reset_page_owner+0x4a/0xf8 mm/page_owner.c:148 reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1446 [inline] free_pcp_prepare+0x254/0x48e mm/page_alloc.c:1496 free_unref_page_prepare mm/page_alloc.c:3369 [inline] free_unref_page+0x60/0x2ae mm/page_alloc.c:3464 free_the_page mm/page_alloc.c:750 [inline] __free_pages+0xd6/0x106 mm/page_alloc.c:5635 __free_slab+0xb4/0x10a mm/slub.c:2069 free_slab+0x3c/0x19c mm/slub.c:2092 discard_slab+0x3c/0x54 mm/slub.c:2098 __slab_free+0x202/0x294 mm/slub.c:3689 do_slab_free mm/slub.c:3731 [inline] ___cache_free+0x136/0x144 mm/slub.c:3794 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x84/0x154 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x15e/0x1ec mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x5c/0x80 mm/kasan/common.c:302 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slab.h:761 [inline] slab_alloc_node mm/slub.c:3452 [inline] slab_alloc mm/slub.c:3460 [inline] __kmem_cache_alloc_lru mm/slub.c:3467 [inline] kmem_cache_alloc+0x148/0x2c6 mm/slub.c:3476 kmem_cache_zalloc include/linux/slab.h:710 [inline] jbd2_alloc_handle include/linux/jbd2.h:1596 [inline] new_handle fs/jbd2/transaction.c:476 [inline] jbd2__journal_start+0x110/0x33a fs/jbd2/transaction.c:503 __ext4_journal_start_sb+0x168/0x6de fs/ext4/ext4_jbd2.c:111 __ext4_journal_start fs/ext4/ext4_jbd2.h:326 [inline] __ext4_unlink+0x2aa/0x71a fs/ext4/namei.c:3240 Memory state around the buggy address: ff600000129b8f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ff600000129b8f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ff600000129b9000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ff600000129b9080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ff600000129b9100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== list_add corruption. next->prev should be prev (ffffffff85de8be0), but was 062e01db0000182b. (next=ff600000129b9000). ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:27! Kernel BUG [#1] Modules linked in: CPU: 0 PID: 6218 Comm: syz-executor.1 Tainted: G B W 6.2.0-rc1-syzkaller #0 Hardware name: riscv-virtio,qemu (DT) epc : __list_add_valid+0xb0/0xc4 lib/list_debug.c:27 ra : __list_add_valid+0xb0/0xc4 lib/list_debug.c:27 epc : ffffffff80bbf9ea ra : ffffffff80bbf9ea sp : ff200000016475b0 gp : ffffffff85efe540 tp : ff60000011b70000 t0 : 0000000000000000 t1 : 00000000000f0000 t2 : 00ffffffe100c197 s0 : ff200000016475e0 s1 : ff600000129b9000 a0 : 0000000000000075 a1 : 00000000000f0000 a2 : ffffffff80137272 a3 : ff20000004c4b000 a4 : 4288af784aebac00 a5 : 4288af784aebac00 a6 : 0000000000000003 a7 : 0000000000000000 s2 : ffffffff85de8be0 s3 : 062e01db0000182b s4 : ff6000002805e000 s5 : ff600000129b9000 s6 : 0000000000000001 s7 : ff6000002805f018 s8 : ff6000002805d0f0 s9 : ff6000002805d1a0 s10: ff6000002805d140 s11: ff6000000849e028 t3 : 000000007fffffff t4 : ffebffff0b53b0e8 t5 : ffebffff0b53b0e9 t6 : 0000000000040000 status: 0000000000000120 badaddr: 0000000000000000 cause: 0000000000000003 [] __list_add_valid+0xb0/0xc4 lib/list_debug.c:27 [] __list_add include/linux/list.h:69 [inline] [] list_add include/linux/list.h:88 [inline] [] nfc_llcp_register_device+0x476/0x4e4 net/nfc/llcp_core.c:1603 [] nfc_register_device+0x8a/0x2b2 net/nfc/core.c:1124 [] nci_register_device+0x52c/0x60a net/nfc/nci/core.c:1257 [] virtual_ncidev_open+0xf8/0x174 drivers/nfc/virtual_ncidev.c:148 [] misc_open+0x26e/0x2c6 drivers/char/misc.c:165 [] chrdev_open+0x1d4/0x478 fs/char_dev.c:414 [] do_dentry_open+0x3a6/0x914 fs/open.c:882 [] vfs_open+0x52/0x5e fs/open.c:1013 [] do_open fs/namei.c:3557 [inline] [] path_openat+0x1140/0x17b6 fs/namei.c:3714 [] do_filp_open+0x11c/0x246 fs/namei.c:3741 [] do_sys_openat2+0x174/0x31e fs/open.c:1310 [] do_sys_open fs/open.c:1326 [inline] [] __do_sys_openat fs/open.c:1342 [inline] [] sys_openat+0xdc/0x164 fs/open.c:1337 [] ret_from_syscall+0x0/0x2 ---[ end trace 0000000000000000 ]---