================================================================== BUG: KASAN: slab-out-of-bounds in __bfs+0x154/0x394 kernel/locking/lockdep.c:1708 Read of size 8 at addr ffffaf801436fbf0 by task syz-executor.0/2039 CPU: 0 PID: 2039 Comm: syz-executor.0 Not tainted 5.17.0-rc1-syzkaller-00002-g0966d385830d #0 Hardware name: riscv-virtio,qemu (DT) 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 [] __bfs+0x154/0x394 kernel/locking/lockdep.c:1708 [] __bfs_forwards kernel/locking/lockdep.c:1803 [inline] [] check_path.constprop.0+0x24/0x46 kernel/locking/lockdep.c:2104 [] check_noncircular+0x11a/0x1fe kernel/locking/lockdep.c:2131 [] check_prev_add kernel/locking/lockdep.c:3063 [inline] [] check_prevs_add kernel/locking/lockdep.c:3186 [inline] [] validate_chain kernel/locking/lockdep.c:3801 [inline] [] __lock_acquire+0x19a4/0x333e kernel/locking/lockdep.c:5027 [] lock_acquire.part.0+0x1d0/0x424 kernel/locking/lockdep.c:5639 [] lock_acquire+0x54/0x6a kernel/locking/lockdep.c:5612 [] local_lock_acquire include/linux/local_lock_internal.h:29 [inline] [] rmqueue_pcplist mm/page_alloc.c:3660 [inline] [] rmqueue mm/page_alloc.c:3698 [inline] [] get_page_from_freelist+0xbc2/0x12d8 mm/page_alloc.c:4162 Allocated by task 2039: 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+0x190/0x318 mm/slub.c:4424 kmalloc include/linux/slab.h:586 [inline] kzalloc.constprop.0+0x24/0x2e include/linux/slab.h:715 __register_sysctl_table+0xfc/0xcb0 fs/proc/proc_sysctl.c:1335 register_net_sysctl+0x23e/0x2f6 net/sysctl_net.c:169 neigh_sysctl_register+0x21e/0x380 net/core/neighbour.c:3787 devinet_sysctl_register+0x9e/0x142 net/ipv4/devinet.c:2618 inetdev_init+0x1d8/0x3d8 net/ipv4/devinet.c:278 inetdev_event+0x88c/0xe9e net/ipv4/devinet.c:1532 notifier_call_chain+0xb8/0x188 kernel/notifier.c:84 raw_notifier_call_chain+0x2a/0x38 kernel/notifier.c:392 call_netdevice_notifiers_info+0x9e/0x10c net/core/dev.c:1919 call_netdevice_notifiers_extack net/core/dev.c:1931 [inline] call_netdevice_notifiers net/core/dev.c:1945 [inline] register_netdevice+0xae8/0xc6a net/core/dev.c:9698 hsr_dev_finalize+0x2f4/0x41c net/hsr/hsr_device.c:535 hsr_newlink+0x21c/0x3e4 net/hsr/hsr_netlink.c:102 __rtnl_newlink+0xc16/0xfa0 net/core/rtnetlink.c:3479 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 ffffaf801436f800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 1008 bytes inside of 1024-byte region [ffffaf801436f800, ffffaf801436fc00) The buggy address belongs to the page: page:ffffaf807abf8540 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffffaf801436b000 pfn:0x94568 head:ffffaf807abf8540 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x9000010200(slab|head|section=18|node=0|zone=0) raw: 0000009000010200 ffffaf807a91a8c8 ffffaf807ab275c8 ffffaf8007201dc0 raw: ffffaf801436b000 000000000010000d 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 0xd2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 2015, ts 483394907900, free_ts 483110442700 __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] __kmalloc_node_track_caller+0x26c/0x362 mm/slub.c:4957 kmalloc_reserve net/core/skbuff.c:354 [inline] __alloc_skb+0xee/0x2e4 net/core/skbuff.c:426 alloc_skb include/linux/skbuff.h:1158 [inline] __tcp_send_ack.part.0+0x56/0x350 net/ipv4/tcp_output.c:3930 __tcp_send_ack net/ipv4/tcp_output.c:3962 [inline] tcp_send_ack+0x60/0x74 net/ipv4/tcp_output.c:3962 tcp_cleanup_rbuf+0x2da/0x318 net/ipv4/tcp.c:1580 tcp_recvmsg_locked+0x636/0x13f6 net/ipv4/tcp.c:2533 tcp_recvmsg+0x190/0x414 net/ipv4/tcp.c:2563 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_compound_page+0x70/0x8a mm/page_alloc.c:729 destroy_compound_page include/linux/mm.h:889 [inline] __put_compound_page+0x7c/0xb0 mm/swap.c:112 __put_page+0x48/0x100 mm/swap.c:128 folio_put include/linux/mm.h:1199 [inline] put_page include/linux/mm.h:1237 [inline] __skb_frag_unref include/linux/skbuff.h:3178 [inline] skb_release_data+0x2f8/0x3c4 net/core/skbuff.c:672 skb_release_all net/core/skbuff.c:742 [inline] __kfree_skb+0x38/0x50 net/core/skbuff.c:756 __sk_defer_free_flush net/ipv4/tcp.c:1592 [inline] sk_defer_free_flush include/net/tcp.h:1378 [inline] tcp_recvmsg+0x1f2/0x414 net/ipv4/tcp.c:2566 inet_recvmsg+0x10a/0x4ba net/ipv4/af_inet.c:850 sock_recvmsg_nosec net/socket.c:948 [inline] sock_recvmsg net/socket.c:966 [inline] sock_recvmsg net/socket.c:962 [inline] sock_read_iter+0x26c/0x2ba net/socket.c:1039 call_read_iter include/linux/fs.h:2068 [inline] new_sync_read+0x3ae/0x3d8 fs/read_write.c:400 vfs_read+0x2ce/0x324 fs/read_write.c:481 ksys_read+0x1c4/0x224 fs/read_write.c:619 __do_sys_read fs/read_write.c:629 [inline] sys_read+0x28/0x36 fs/read_write.c:627 ret_from_syscall+0x0/0x2 Memory state around the buggy address: ffffaf801436fa80: fc fc fc fc f1 f1 f1 f1 00 f3 f3 f3 fc fc fc fc ffffaf801436fb00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffffaf801436fb80: 00 00 00 00 f1 f1 f1 f1 00 f2 f2 f2 fc fc fc fc ^ ffffaf801436fc00: 00 00 00 f3 f3 f3 f3 f3 fc fc fc fc fc fc fc fc ffffaf801436fc80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================