==================================================================
BUG: KASAN: slab-use-after-free in rose_get_neigh+0x348/0x880 net/rose/rose_route.c:692
Read of size 1 at addr ffff0000dc7b0830 by task syz.2.426/9047

CPU: 1 UID: 0 PID: 9047 Comm: syz.2.426 Not tainted 6.16.0-rc2-syzkaller-g9aa9b43d689e #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:501 (C)
 __dump_stack+0x30/0x40 lib/dump_stack.c:94
 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
 print_address_description+0xa8/0x254 mm/kasan/report.c:408
 print_report+0x68/0x84 mm/kasan/report.c:521
 kasan_report+0xb0/0x110 mm/kasan/report.c:634
 __asan_report_load1_noabort+0x20/0x2c mm/kasan/report_generic.c:378
 rose_get_neigh+0x348/0x880 net/rose/rose_route.c:692
 rose_connect+0x354/0xd54 net/rose/af_rose.c:816
 __sys_connect_file net/socket.c:2038 [inline]
 __sys_connect+0x2a0/0x3ac net/socket.c:2057
 __do_sys_connect net/socket.c:2063 [inline]
 __se_sys_connect net/socket.c:2060 [inline]
 __arm64_sys_connect+0x7c/0x94 net/socket.c:2060
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x58/0x17c arch/arm64/kernel/entry-common.c:767
 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:786
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600

Allocated by task 6760:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x40/0x78 mm/kasan/common.c:68
 kasan_save_alloc_info+0x44/0x54 mm/kasan/generic.c:562
 poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
 __kasan_kmalloc+0x9c/0xb4 mm/kasan/common.c:394
 kasan_kmalloc include/linux/kasan.h:260 [inline]
 __kmalloc_cache_noprof+0x2a4/0x3fc mm/slub.c:4359
 kmalloc_noprof include/linux/slab.h:905 [inline]
 rose_add_node+0x1f4/0xbb4 net/rose/rose_route.c:85
 rose_rt_ioctl+0x8b4/0xd58 net/rose/rose_route.c:747
 rose_ioctl+0x378/0xab8 net/rose/af_rose.c:1380
 sock_do_ioctl+0xf4/0x2b4 net/socket.c:1190
 sock_ioctl+0x57c/0x84c net/socket.c:1311
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl fs/ioctl.c:893 [inline]
 __arm64_sys_ioctl+0x14c/0x1c4 fs/ioctl.c:893
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x58/0x17c arch/arm64/kernel/entry-common.c:767
 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:786
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600

Freed by task 8986:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x40/0x78 mm/kasan/common.c:68
 kasan_save_free_info+0x58/0x70 mm/kasan/generic.c:576
 poison_slab_object mm/kasan/common.c:247 [inline]
 __kasan_slab_free+0x68/0x88 mm/kasan/common.c:264
 kasan_slab_free include/linux/kasan.h:233 [inline]
 slab_free_hook mm/slub.c:2381 [inline]
 slab_free mm/slub.c:4643 [inline]
 kfree+0x17c/0x474 mm/slub.c:4842
 rose_remove_neigh+0x240/0x2bc net/rose/rose_route.c:-1
 rose_rt_device_down+0x620/0x67c net/rose/rose_route.c:522
 rose_device_event+0x5d8/0x68c net/rose/af_rose.c:248
 notifier_call_chain+0x1b8/0x4e4 kernel/notifier.c:85
 raw_notifier_call_chain+0x3c/0x50 kernel/notifier.c:453
 call_netdevice_notifiers_info net/core/dev.c:2230 [inline]
 call_netdevice_notifiers_extack net/core/dev.c:2268 [inline]
 call_netdevice_notifiers net/core/dev.c:2282 [inline]
 dev_close_many+0x2d4/0x448 net/core/dev.c:1785
 netif_close+0x148/0x1f8 net/core/dev.c:1798
 dev_close+0xf8/0x1e4 net/core/dev_api.c:220
 bpq_device_event+0x308/0x5fc drivers/net/hamradio/bpqether.c:528
 notifier_call_chain+0x1b8/0x4e4 kernel/notifier.c:85
 raw_notifier_call_chain+0x3c/0x50 kernel/notifier.c:453
 call_netdevice_notifiers_info net/core/dev.c:2230 [inline]
 call_netdevice_notifiers_extack net/core/dev.c:2268 [inline]
 call_netdevice_notifiers net/core/dev.c:2282 [inline]
 dev_close_many+0x2d4/0x448 net/core/dev.c:1785
 netif_close+0x148/0x1f8 net/core/dev.c:1798
 dev_close+0xf8/0x1e4 net/core/dev_api.c:220
 bond_setup_by_slave+0x70/0x374 drivers/net/bonding/bond_main.c:1622
 bond_enslave+0x620/0x2eac drivers/net/bonding/bond_main.c:2034
 bond_do_ioctl+0x5b0/0x96c drivers/net/bonding/bond_main.c:4690
 bond_siocdevprivate+0x18c/0x1dc drivers/net/bonding/bond_main.c:-1
 dev_siocdevprivate net/core/dev_ioctl.c:521 [inline]
 dev_ifsioc+0x854/0xb90 net/core/dev_ioctl.c:633
 dev_ioctl+0x530/0xc74 net/core/dev_ioctl.c:850
 sock_ioctl+0x790/0x84c net/socket.c:1236
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl fs/ioctl.c:893 [inline]
 __arm64_sys_ioctl+0x14c/0x1c4 fs/ioctl.c:893
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x58/0x17c arch/arm64/kernel/entry-common.c:767
 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:786
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600

The buggy address belongs to the object at ffff0000dc7b0800
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 48 bytes inside of
 freed 512-byte region [ffff0000dc7b0800, ffff0000dc7b0a00)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11c7b0
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
anon flags: 0x5ffc00000000040(head|node=0|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 05ffc00000000040 ffff0000c0001c80 0000000000000000 dead000000000001
raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 05ffc00000000040 ffff0000c0001c80 0000000000000000 dead000000000001
head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 05ffc00000000002 fffffdffc371ec01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000dc7b0700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff0000dc7b0780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff0000dc7b0800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                     ^
 ffff0000dc7b0880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff0000dc7b0900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 1 UID: 0 PID: 9047 Comm: syz.2.426 Tainted: G    B               6.16.0-rc2-syzkaller-g9aa9b43d689e #0 PREEMPT 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:501 (C)
 __dump_stack+0x30/0x40 lib/dump_stack.c:94
 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
 dump_stack+0x1c/0x28 lib/dump_stack.c:129
 fail_dump lib/fault-inject.c:73 [inline]
 should_fail_ex+0x41c/0x594 lib/fault-inject.c:174
 should_failslab+0xc0/0x128 mm/failslab.c:46
 slab_pre_alloc_hook mm/slub.c:4101 [inline]
 slab_alloc_node mm/slub.c:4177 [inline]
 kmem_cache_alloc_node_noprof+0x88/0x3f4 mm/slub.c:4249
 __alloc_skb+0x144/0x2ec net/core/skbuff.c:660
 alloc_skb include/linux/skbuff.h:1336 [inline]
 rose_write_internal+0x100/0x17c4 net/rose/rose_subr.c:124
 rose_connect+0x724/0xd54 net/rose/af_rose.c:879
 __sys_connect_file net/socket.c:2038 [inline]
 __sys_connect+0x2a0/0x3ac net/socket.c:2057
 __do_sys_connect net/socket.c:2063 [inline]
 __se_sys_connect net/socket.c:2060 [inline]
 __arm64_sys_connect+0x7c/0x94 net/socket.c:2060
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x58/0x17c arch/arm64/kernel/entry-common.c:767
 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:786
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600