================================================================== BUG: KASAN: slab-out-of-bounds in walk_stackframe+0x11c/0x260 arch/riscv/kernel/stacktrace.c:57 Read of size 8 at addr ffffaf800ebe7b50 by task kworker/0:5/3954 CPU: 0 PID: 3954 Comm: kworker/0:5 Not tainted 5.17.0-rc1-syzkaller-00002-g0966d385830d #0 Hardware name: riscv-virtio,qemu (DT) Workqueue: usb_hub_wq hub_event Call Trace: [] dump_backtrace+0x2e/0x3c arch/riscv/kernel/stacktrace.c:113 [] show_stack+0x34/0x40 arch/riscv/kernel/stacktrace.c:119 [] __dump_stack lib/dump_stack.c:88 [inline] [] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:106 [] print_address_description.constprop.0+0x2a/0x330 mm/kasan/report.c:255 [] __kasan_report mm/kasan/report.c:442 [inline] [] kasan_report+0x184/0x1e0 mm/kasan/report.c:459 [] check_region_inline mm/kasan/generic.c:183 [inline] [] __asan_load8+0x6e/0x96 mm/kasan/generic.c:256 [] walk_stackframe+0x11c/0x260 arch/riscv/kernel/stacktrace.c:57 [] arch_stack_walk+0x2c/0x3c arch/riscv/kernel/stacktrace.c:146 [] stack_trace_save+0xa6/0xd8 kernel/stacktrace.c:122 [] kasan_save_stack+0x2c/0x58 mm/kasan/common.c:38 [] kasan_set_track+0x1a/0x26 mm/kasan/common.c:45 [] kasan_set_free_info+0x1e/0x3a mm/kasan/generic.c:370 [] ____kasan_slab_free mm/kasan/common.c:366 [inline] [] ____kasan_slab_free+0x15e/0x180 mm/kasan/common.c:328 [] __kasan_slab_free+0x10/0x18 mm/kasan/common.c:374 [] kasan_slab_free include/linux/kasan.h:236 [inline] [] slab_free_hook mm/slub.c:1728 [inline] [] slab_free_freelist_hook+0x8e/0x1cc mm/slub.c:1754 [] slab_free mm/slub.c:3509 [inline] [] kfree+0xe0/0x3e4 mm/slub.c:4562 Allocated by task 2066: stack_trace_save+0xa6/0xd8 kernel/stacktrace.c:122 kasan_save_stack+0x2c/0x58 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] ____kasan_kmalloc mm/kasan/common.c:515 [inline] ____kasan_kmalloc mm/kasan/common.c:474 [inline] __kasan_kmalloc+0x80/0xb2 mm/kasan/common.c:524 kasan_kmalloc include/linux/kasan.h:270 [inline] __kmalloc_node+0x1b0/0x36c mm/slub.c:4472 kmalloc_node include/linux/slab.h:604 [inline] kzalloc_node include/linux/slab.h:726 [inline] qdisc_alloc+0x7c/0x522 net/sched/sch_generic.c:941 qdisc_create_dflt+0x66/0x42c net/sched/sch_generic.c:1000 attach_one_default_qdisc+0x94/0x11e net/sched/sch_generic.c:1148 netdev_for_each_tx_queue include/linux/netdevice.h:2373 [inline] attach_default_qdiscs net/sched/sch_generic.c:1166 [inline] dev_activate+0x3f2/0x7c0 net/sched/sch_generic.c:1221 __dev_open+0x2e8/0x384 net/core/dev.c:1416 __dev_change_flags+0x41a/0x4e0 net/core/dev.c:8139 dev_change_flags+0x50/0xba net/core/dev.c:8210 do_setlink+0x5d6/0x21c4 net/core/rtnetlink.c:2729 __rtnl_newlink+0x99e/0xfa0 net/core/rtnetlink.c:3412 rtnl_newlink+0x60/0x8c net/core/rtnetlink.c:3527 rtnetlink_rcv_msg+0x338/0x9a0 net/core/rtnetlink.c:5592 netlink_rcv_skb+0xf8/0x2be net/netlink/af_netlink.c:2494 rtnetlink_rcv+0x26/0x30 net/core/rtnetlink.c:5610 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline] netlink_unicast+0x40e/0x5fe net/netlink/af_netlink.c:1343 netlink_sendmsg+0x4e0/0x994 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg+0xa0/0xc4 net/socket.c:725 __sys_sendto+0x1f2/0x2e0 net/socket.c:2040 __do_sys_sendto net/socket.c:2052 [inline] sys_sendto+0x3e/0x52 net/socket.c:2048 ret_from_syscall+0x0/0x2 The buggy address belongs to the object at ffffaf800ebe7800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 848 bytes inside of 1024-byte region [ffffaf800ebe7800, ffffaf800ebe7c00) The buggy address belongs to the page: page:ffffaf807aa6e700 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8ede0 head:ffffaf807aa6e700 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x8800010200(slab|head|section=17|node=0|zone=0) raw: 0000008800010200 0000000000000100 0000000000000122 ffffaf8007201dc0 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 raw: 00000000000007ff page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x52a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 2132, ts 1413880102700, free_ts 1413506823600 __set_page_owner+0x48/0x136 mm/page_owner.c:183 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0xd0/0x10a mm/page_alloc.c:2427 prep_new_page mm/page_alloc.c:2434 [inline] get_page_from_freelist+0x8da/0x12d8 mm/page_alloc.c:4165 __alloc_pages+0x150/0x3b6 mm/page_alloc.c:5389 alloc_pages+0x132/0x2a6 mm/mempolicy.c:2271 alloc_slab_page.constprop.0+0xc2/0xfa mm/slub.c:1799 allocate_slab mm/slub.c:1944 [inline] new_slab+0x76/0x2cc mm/slub.c:2004 ___slab_alloc+0x56e/0x918 mm/slub.c:3018 __slab_alloc.constprop.0+0x50/0x8c mm/slub.c:3105 slab_alloc_node mm/slub.c:3196 [inline] slab_alloc mm/slub.c:3238 [inline] __kmalloc+0x268/0x318 mm/slub.c:4420 kmalloc include/linux/slab.h:586 [inline] kzalloc+0x26/0x32 include/linux/slab.h:715 neigh_alloc net/core/neighbour.c:433 [inline] ___neigh_create+0xe86/0x1cf0 net/core/neighbour.c:618 __neigh_create+0x30/0x40 net/core/neighbour.c:707 ip6_finish_output2+0xd64/0x1256 net/ipv6/ip6_output.c:123 __ip6_finish_output net/ipv6/ip6_output.c:191 [inline] __ip6_finish_output+0x47c/0x8f6 net/ipv6/ip6_output.c:170 ip6_finish_output+0x3e/0x176 net/ipv6/ip6_output.c:201 page last free stack trace: __reset_page_owner+0x4a/0xea mm/page_owner.c:142 reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1352 [inline] free_pcp_prepare+0x29c/0x45e mm/page_alloc.c:1404 free_unref_page_prepare mm/page_alloc.c:3325 [inline] free_unref_page+0x6a/0x31e mm/page_alloc.c:3404 free_the_page mm/page_alloc.c:706 [inline] __free_pages+0xe2/0x112 mm/page_alloc.c:5474 __free_slab+0x122/0x27c mm/slub.c:2028 free_slab mm/slub.c:2043 [inline] discard_slab+0x4c/0x7a mm/slub.c:2049 __unfreeze_partials+0x16a/0x18e mm/slub.c:2536 put_cpu_partial+0xf6/0x162 mm/slub.c:2612 __slab_free+0x166/0x29c mm/slub.c:3378 do_slab_free mm/slub.c:3497 [inline] ___cache_free+0x17c/0x354 mm/slub.c:3516 qlink_free mm/kasan/quarantine.c:157 [inline] qlist_free_all+0x7c/0x132 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x14c/0x1c8 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x5c/0x98 mm/kasan/common.c:446 kasan_slab_alloc include/linux/kasan.h:260 [inline] slab_post_alloc_hook mm/slab.h:732 [inline] slab_alloc_node mm/slub.c:3230 [inline] slab_alloc mm/slub.c:3238 [inline] kmem_cache_alloc+0x338/0x3de mm/slub.c:3243 vm_area_dup+0xa4/0x224 kernel/fork.c:357 __split_vma+0x7c/0x2fa mm/mmap.c:2720 Memory state around the buggy address: ffffaf800ebe7a00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffaf800ebe7a80: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc >ffffaf800ebe7b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffffaf800ebe7b80: fc fc fc fc f1 f1 f1 f1 00 00 00 f3 f3 f3 f3 f3 ffffaf800ebe7c00: 00 00 00 00 fc fc fc fc 00 00 00 00 00 00 00 00 ==================================================================