ubi0: attaching mtd0 ubi0: scanning is finished ================================================================== BUG: KASAN: slab-use-after-free in notifier_chain_register+0x141/0x3f0 kernel/notifier.c:27 Read of size 4 at addr ffff8880256318d8 by task syz.3.6087/26667 CPU: 0 UID: 0 PID: 26667 Comm: syz.3.6087 Not tainted 6.13.0-syzkaller-09734-g2a9f04bde07a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x169/0x550 mm/kasan/report.c:489 kasan_report+0x143/0x180 mm/kasan/report.c:602 notifier_chain_register+0x141/0x3f0 kernel/notifier.c:27 __blocking_notifier_chain_register kernel/notifier.c:264 [inline] blocking_notifier_chain_register+0x61/0xc0 kernel/notifier.c:282 ubi_wl_init+0x3396/0x3720 drivers/mtd/ubi/wl.c:1960 ubi_attach+0x3e01/0x5b80 drivers/mtd/ubi/attach.c:1605 ubi_attach_mtd_dev+0x1a3a/0x3540 drivers/mtd/ubi/build.c:1004 ctrl_cdev_ioctl+0x346/0x570 drivers/mtd/ubi/cdev.c:1043 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl+0xf5/0x170 fs/ioctl.c:892 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 RIP: 0033:0x7f2ed0f8cda9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f2ed1e8b038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f2ed11a6080 RCX: 00007f2ed0f8cda9 RDX: 0000000020000502 RSI: 0000000040186f40 RDI: 0000000000000008 RBP: 00007f2ed100e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f2ed11a6080 R15: 00007ffdca1d9388 Allocated by task 26516: 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:377 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4294 [inline] __kmalloc_noprof+0x285/0x4c0 mm/slub.c:4306 kmalloc_noprof include/linux/slab.h:905 [inline] kmalloc_array_noprof include/linux/slab.h:946 [inline] snd_pcm_plugin_build+0x24f/0x4e0 sound/core/oss/pcm_plugin.c:181 snd_pcm_plugin_build_route+0x198/0x340 sound/core/oss/route.c:103 snd_pcm_plug_format_plugins+0xec0/0x17e0 sound/core/oss/pcm_plugin.c:525 snd_pcm_oss_change_params_locked+0x22ab/0x3d60 sound/core/oss/pcm_oss.c:975 snd_pcm_oss_change_params sound/core/oss/pcm_oss.c:1105 [inline] snd_pcm_oss_get_active_substream+0x201/0x280 sound/core/oss/pcm_oss.c:1122 snd_pcm_oss_get_channels sound/core/oss/pcm_oss.c:1816 [inline] snd_pcm_oss_set_channels+0x23b/0x5c0 sound/core/oss/pcm_oss.c:1808 snd_pcm_oss_ioctl+0xc9d/0xff0 sound/core/oss/pcm_oss.c:2660 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl+0xf5/0x170 fs/ioctl.c:892 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 26516: 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:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2353 [inline] slab_free mm/slub.c:4609 [inline] kfree+0x196/0x430 mm/slub.c:4757 snd_pcm_plugin_free+0x86/0xc0 sound/core/oss/pcm_plugin.c:197 snd_pcm_oss_plugin_clear sound/core/oss/pcm_oss.c:539 [inline] snd_pcm_oss_change_params_locked+0x2139/0x3d60 sound/core/oss/pcm_oss.c:972 snd_pcm_oss_change_params sound/core/oss/pcm_oss.c:1105 [inline] snd_pcm_oss_get_active_substream+0x201/0x280 sound/core/oss/pcm_oss.c:1122 snd_pcm_oss_get_rate sound/core/oss/pcm_oss.c:1778 [inline] snd_pcm_oss_set_rate+0x248/0x5d0 sound/core/oss/pcm_oss.c:1770 snd_pcm_oss_ioctl+0xe2e/0xff0 sound/core/oss/pcm_oss.c:2623 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl+0xf5/0x170 fs/ioctl.c:892 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 ffff888025630000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 6360 bytes inside of freed 8192-byte region [ffff888025630000, ffff888025632000) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x25630 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88801ac42280 ffffea0001ae3600 dead000000000002 raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88801ac42280 ffffea0001ae3600 dead000000000002 head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000 head: 00fff00000000003 ffffea0000958c01 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 5823, tgid 5823 (syz-executor), ts 81868695965, free_ts 81856460465 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f4/0x240 mm/page_alloc.c:1551 prep_new_page mm/page_alloc.c:1559 [inline] get_page_from_freelist+0x3651/0x37a0 mm/page_alloc.c:3477 __alloc_frozen_pages_noprof+0x292/0x710 mm/page_alloc.c:4739 alloc_pages_mpol+0x311/0x660 mm/mempolicy.c:2270 alloc_slab_page mm/slub.c:2423 [inline] allocate_slab+0x8f/0x3a0 mm/slub.c:2587 new_slab mm/slub.c:2640 [inline] ___slab_alloc+0xc27/0x14a0 mm/slub.c:3826 __slab_alloc+0x58/0xa0 mm/slub.c:3916 __slab_alloc_node mm/slub.c:3991 [inline] slab_alloc_node mm/slub.c:4152 [inline] __do_kmalloc_node mm/slub.c:4293 [inline] __kmalloc_node_noprof+0x2ee/0x4d0 mm/slub.c:4300 __kvmalloc_node_noprof+0x72/0x190 mm/util.c:662 kvmalloc_array_node_noprof include/linux/slab.h:1063 [inline] __ptr_ring_init_queue_alloc_noprof include/linux/ptr_ring.h:471 [inline] ptr_ring_init_noprof include/linux/ptr_ring.h:489 [inline] skb_array_init_noprof include/linux/skb_array.h:182 [inline] pfifo_fast_init+0x389/0x6e0 net/sched/sch_generic.c:866 qdisc_create_dflt+0x136/0x4b0 net/sched/sch_generic.c:1016 attach_one_default_qdisc net/sched/sch_generic.c:1175 [inline] netdev_for_each_tx_queue include/linux/netdevice.h:2590 [inline] attach_default_qdiscs net/sched/sch_generic.c:1193 [inline] dev_activate+0x3c0/0x1240 net/sched/sch_generic.c:1252 __dev_open+0x38e/0x4a0 net/core/dev.c:1613 __dev_change_flags+0x1e2/0x6f0 net/core/dev.c:9172 dev_change_flags+0x8b/0x1a0 net/core/dev.c:9244 do_setlink+0xc90/0x4210 net/core/rtnetlink.c:3118 page last free pid 5822 tgid 5822 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_frozen_pages+0xe04/0x10e0 mm/page_alloc.c:2660 __slab_free+0x2c2/0x380 mm/slub.c:4520 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9a/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:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4115 [inline] slab_alloc_node mm/slub.c:4164 [inline] __kmalloc_cache_noprof+0x1d9/0x390 mm/slub.c:4320 kmalloc_noprof include/linux/slab.h:901 [inline] kzalloc_noprof include/linux/slab.h:1037 [inline] nsim_fib6_rt_create drivers/net/netdevsim/fib.c:547 [inline] nsim_fib6_rt_insert drivers/net/netdevsim/fib.c:752 [inline] nsim_fib6_event drivers/net/netdevsim/fib.c:856 [inline] nsim_fib_event drivers/net/netdevsim/fib.c:889 [inline] nsim_fib_event_work+0x19c5/0x4130 drivers/net/netdevsim/fib.c:1493 process_one_work kernel/workqueue.c:3236 [inline] process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3317 worker_thread+0x870/0xd30 kernel/workqueue.c:3398 kthread+0x7a9/0x920 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Memory state around the buggy address: ffff888025631780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888025631800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888025631880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888025631900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888025631980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================