netlink: 260 bytes leftover after parsing attributes in process `syz.2.239'. ================================================================================ UBSAN: array-index-out-of-bounds in drivers/md/md.c:1390:20 index 1027 is out of range for type 'mdp_disk_t[27]' (aka 'struct mdp_device_descriptor_s[27]') CPU: 1 PID: 5546 Comm: syz.2.239 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026 Call trace: dump_backtrace+0x1c4/0x1f0 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106 dump_stack+0x1c/0x5c lib/dump_stack.c:113 ubsan_epilogue+0x14/0x48 lib/ubsan.c:151 __ubsan_handle_out_of_bounds+0xd0/0xf8 lib/ubsan.c:282 super_90_validate+0x110c/0x15b8 drivers/md/md.c:1390 add_bound_rdev+0x128/0x494 drivers/md/md.c:2908 md_add_new_disk+0xc0c/0x1484 drivers/md/md.c:-1 md_ioctl+0x2158/0x25cc drivers/md/md.c:7807 blkdev_ioctl+0x654/0xb74 block/ioctl.c:626 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:856 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x12c arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:589 ================================================================================ ================================================================== BUG: KASAN: slab-out-of-bounds in super_90_validate+0x1128/0x15b8 drivers/md/md.c:1392 Read of size 4 at addr ffff0000f6578390 by task syz.2.239/5546 CPU: 1 PID: 5546 Comm: syz.2.239 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026 Call trace: dump_backtrace+0x1c4/0x1f0 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106 print_address_description+0x88/0x218 mm/kasan/report.c:316 print_report+0x50/0x68 mm/kasan/report.c:420 kasan_report+0xa8/0xfc mm/kasan/report.c:524 __asan_report_load4_noabort+0x2c/0x38 mm/kasan/report_generic.c:350 super_90_validate+0x1128/0x15b8 drivers/md/md.c:1392 add_bound_rdev+0x128/0x494 drivers/md/md.c:2908 md_add_new_disk+0xc0c/0x1484 drivers/md/md.c:-1 md_ioctl+0x2158/0x25cc drivers/md/md.c:7807 blkdev_ioctl+0x654/0xb74 block/ioctl.c:626 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:856 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x12c arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:589 Allocated by task 0: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:53 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:505 ____kasan_kmalloc mm/kasan/common.c:375 [inline] __kasan_kmalloc+0xa0/0xb8 mm/kasan/common.c:384 kasan_kmalloc include/linux/kasan.h:211 [inline] kmalloc_trace+0x7c/0x94 mm/slab_common.c:1031 kmalloc include/linux/slab.h:563 [inline] kzalloc include/linux/slab.h:699 [inline] ref_tracker_alloc+0x138/0x3f0 lib/ref_tracker.c:85 __netdev_tracker_alloc include/linux/netdevice.h:4053 [inline] netdev_hold include/linux/netdevice.h:4082 [inline] dst_init+0xc0/0x3dc net/core/dst.c:52 dst_alloc+0x124/0x16c net/core/dst.c:92 ip6_dst_alloc net/ipv6/route.c:345 [inline] icmp6_dst_alloc+0x7c/0x3fc net/ipv6/route.c:3316 ndisc_send_skb+0x3b8/0x1670 net/ipv6/ndisc.c:493 ndisc_send_rs+0x37c/0x524 net/ipv6/ndisc.c:723 addrconf_rs_timer+0x234/0x54c net/ipv6/addrconf.c:3994 call_timer_fn+0x1b8/0x96c kernel/time/timer.c:1701 expire_timers kernel/time/timer.c:1752 [inline] __run_timers+0x478/0x6d8 kernel/time/timer.c:2023 run_timer_softirq+0x7c/0x114 kernel/time/timer.c:2036 handle_softirqs+0x318/0xc90 kernel/softirq.c:596 __do_softirq+0x14/0x20 kernel/softirq.c:630 The buggy address belongs to the object at ffff0000f6578300 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 16 bytes to the right of 128-byte region [ffff0000f6578300, ffff0000f6578380) The buggy address belongs to the physical page: page:000000004101f395 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x136578 flags: 0x5ffc00000000200(slab|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000000200 fffffc0003d9fb40 dead000000000003 ffff0000c0002300 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000f6578280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000f6578300: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc >ffff0000f6578380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff0000f6578400: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc ffff0000f6578480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================