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 ffff88807f34d8d8 by task syz.3.974/9580 CPU: 1 UID: 0 PID: 9580 Comm: syz.3.974 Not tainted 6.13.0-syzkaller-08265-g9c5968db9e62 #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: 0033:0x7f2d3db8cd29 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:00007f2d3e940038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f2d3dda6080 RCX: 00007f2d3db8cd29 RDX: 0000000020000502 RSI: 0000000040186f40 RDI: 0000000000000006 RBP: 00007f2d3dc0e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f2d3dda6080 R15: 00007ffe36094ce8 Allocated by task 9495: 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_node_track_caller_noprof+0x28b/0x4c0 mm/slub.c:4313 __do_krealloc mm/slub.c:4820 [inline] krealloc_noprof+0x10f/0x2f0 mm/slub.c:4873 copy_array kernel/bpf/verifier.c:1361 [inline] copy_stack_state kernel/bpf/verifier.c:1419 [inline] copy_func_state kernel/bpf/verifier.c:1630 [inline] copy_verifier_state+0x8ef/0xef0 kernel/bpf/verifier.c:1670 is_state_visited kernel/bpf/verifier.c:18797 [inline] do_check+0x452a/0xfa40 kernel/bpf/verifier.c:18959 do_check_common+0x1b4a/0x2030 kernel/bpf/verifier.c:22258 do_check_main kernel/bpf/verifier.c:22349 [inline] bpf_check+0x59f7/0x1c150 kernel/bpf/verifier.c:23145 bpf_prog_load+0x1664/0x20e0 kernel/bpf/syscall.c:2951 __sys_bpf+0x4ee/0x810 kernel/bpf/syscall.c:5794 __do_sys_bpf kernel/bpf/syscall.c:5901 [inline] __se_sys_bpf kernel/bpf/syscall.c:5899 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5899 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 9495: 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 free_func_state kernel/bpf/verifier.c:1605 [inline] free_verifier_state kernel/bpf/verifier.c:1615 [inline] free_states kernel/bpf/verifier.c:22139 [inline] do_check_common+0xbbb/0x2030 kernel/bpf/verifier.c:22270 do_check_main kernel/bpf/verifier.c:22349 [inline] bpf_check+0x59f7/0x1c150 kernel/bpf/verifier.c:23145 bpf_prog_load+0x1664/0x20e0 kernel/bpf/syscall.c:2951 __sys_bpf+0x4ee/0x810 kernel/bpf/syscall.c:5794 __do_sys_bpf kernel/bpf/syscall.c:5901 [inline] __se_sys_bpf kernel/bpf/syscall.c:5899 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5899 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 ffff88807f34c000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 6360 bytes inside of freed 8192-byte region [ffff88807f34c000, ffff88807f34e000) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7f348 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 ffffea00015ee200 dead000000000004 raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88801ac42280 ffffea00015ee200 dead000000000004 head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000 head: 00fff00000000003 ffffea0001fcd201 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 0xd28c0(GFP_NOWAIT|__GFP_IO|__GFP_FS|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5490, tgid 5490 (dhcpcd), ts 190616600407, free_ts 190608065020 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_track_caller_noprof+0x2e9/0x4c0 mm/slub.c:4313 kmalloc_reserve+0x111/0x2a0 net/core/skbuff.c:609 __alloc_skb+0x1f3/0x440 net/core/skbuff.c:678 alloc_skb include/linux/skbuff.h:1331 [inline] netlink_dump+0x1ee/0xe10 net/netlink/af_netlink.c:2284 netlink_recvmsg+0x6ec/0x11a0 net/netlink/af_netlink.c:1974 sock_recvmsg_nosec net/socket.c:1018 [inline] sock_recvmsg+0x22f/0x280 net/socket.c:1040 ____sys_recvmsg+0x1c6/0x480 net/socket.c:2788 ___sys_recvmsg net/socket.c:2830 [inline] __sys_recvmsg+0x291/0x390 net/socket.c:2863 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 page last free pid 5829 tgid 5829 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 discard_slab mm/slub.c:2684 [inline] __put_partials+0x160/0x1c0 mm/slub.c:3153 put_cpu_partial+0x17c/0x250 mm/slub.c:3228 __slab_free+0x290/0x380 mm/slub.c:4479 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] kmem_cache_alloc_noprof+0x1d9/0x380 mm/slub.c:4171 ptlock_alloc+0x20/0x70 mm/memory.c:7044 ptlock_init include/linux/mm.h:2972 [inline] pagetable_pte_ctor include/linux/mm.h:3020 [inline] __pte_alloc_one_noprof include/asm-generic/pgalloc.h:73 [inline] pte_alloc_one+0x73/0x160 arch/x86/mm/pgtable.c:44 __pte_alloc+0x79/0x220 mm/memory.c:447 copy_pte_range mm/memory.c:1107 [inline] copy_pmd_range+0x6fb4/0x77a0 mm/memory.c:1262 copy_pud_range mm/memory.c:1299 [inline] copy_p4d_range mm/memory.c:1323 [inline] copy_page_range+0x99f/0xe90 mm/memory.c:1421 dup_mmap kernel/fork.c:748 [inline] dup_mm kernel/fork.c:1689 [inline] copy_mm+0x1279/0x2110 kernel/fork.c:1741 copy_process+0x1845/0x3d50 kernel/fork.c:2392 kernel_clone+0x223/0x870 kernel/fork.c:2804 Memory state around the buggy address: ffff88807f34d780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807f34d800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88807f34d880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807f34d900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807f34d980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================