================================================================== BUG: KASAN: slab-out-of-bounds in memcpy_from_iter lib/iov_iter.c:380 [inline] BUG: KASAN: slab-out-of-bounds in copy_page_from_iter_atomic+0x96c/0x10dc lib/iov_iter.c:590 Read of size 2048 at addr ffff0000e1fe0400 by task kworker/u4:7/446 CPU: 0 PID: 446 Comm: kworker/u4:7 Not tainted 6.6.0-rc7-syzkaller-00089-g8de1e7afcc1c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023 Workqueue: loop0 loop_workfn Call trace: dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:233 show_stack+0x2c/0x44 arch/arm64/kernel/stacktrace.c:240 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0x174/0x514 mm/kasan/report.c:475 kasan_report+0xd8/0x138 mm/kasan/report.c:588 kasan_check_range+0x254/0x294 mm/kasan/generic.c:187 __asan_memcpy+0x3c/0x84 mm/kasan/shadow.c:105 memcpy_from_iter lib/iov_iter.c:380 [inline] copy_page_from_iter_atomic+0x96c/0x10dc lib/iov_iter.c:590 generic_perform_write+0x310/0x588 mm/filemap.c:3977 shmem_file_write_iter+0x110/0x138 mm/shmem.c:2865 do_iter_write+0x65c/0xaa8 fs/read_write.c:860 vfs_iter_write+0x88/0xac fs/read_write.c:901 lo_write_bvec drivers/block/loop.c:249 [inline] lo_write_simple drivers/block/loop.c:271 [inline] do_req_filebacked drivers/block/loop.c:495 [inline] loop_handle_cmd drivers/block/loop.c:1915 [inline] loop_process_work+0x15e4/0x2534 drivers/block/loop.c:1950 loop_workfn+0x54/0x68 drivers/block/loop.c:1974 process_one_work+0x694/0x1204 kernel/workqueue.c:2630 process_scheduled_works kernel/workqueue.c:2703 [inline] worker_thread+0x938/0xef4 kernel/workqueue.c:2784 kthread+0x288/0x310 kernel/kthread.c:388 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:857 Allocated by task 6537: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x7c mm/kasan/common.c:52 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:511 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:198 [inline] __do_kmalloc_node mm/slab_common.c:1026 [inline] __kmalloc+0xcc/0x1b8 mm/slab_common.c:1039 kmalloc include/linux/slab.h:603 [inline] hfsplus_read_wrapper+0x3ac/0xfcc fs/hfsplus/wrapper.c:178 hfsplus_fill_super+0x2f0/0x166c fs/hfsplus/super.c:413 mount_bdev+0x1e8/0x2b4 fs/super.c:1629 hfsplus_mount+0x44/0x58 fs/hfsplus/super.c:641 legacy_get_tree+0xd4/0x16c fs/fs_context.c:662 vfs_get_tree+0x90/0x288 fs/super.c:1750 do_new_mount+0x25c/0x8c8 fs/namespace.c:3335 path_mount+0x590/0xe04 fs/namespace.c:3662 do_mount fs/namespace.c:3675 [inline] __do_sys_mount fs/namespace.c:3884 [inline] __se_sys_mount fs/namespace.c:3861 [inline] __arm64_sys_mount+0x45c/0x594 fs/namespace.c:3861 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155 el0_svc+0x54/0x158 arch/arm64/kernel/entry-common.c:678 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595 Last potentially related work creation: kasan_save_stack+0x40/0x6c mm/kasan/common.c:45 __kasan_record_aux_stack+0xcc/0xe8 mm/kasan/generic.c:492 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:502 __call_rcu_common kernel/rcu/tree.c:2653 [inline] call_rcu+0x104/0xaf4 kernel/rcu/tree.c:2767 fib6_info_release include/net/ip6_fib.h:332 [inline] __ip6_del_rt+0xf8/0x178 net/ipv6/route.c:3870 ip6_del_rt+0xdc/0x13c net/ipv6/route.c:3881 __ipv6_ifa_notify+0x86c/0xf54 net/ipv6/addrconf.c:6232 addrconf_ifdown+0xdc0/0x17a8 net/ipv6/addrconf.c:3916 addrconf_notify+0x324/0xcd0 notifier_call_chain+0x1a4/0x510 kernel/notifier.c:93 raw_notifier_call_chain+0x3c/0x50 kernel/notifier.c:461 call_netdevice_notifiers_info net/core/dev.c:1995 [inline] call_netdevice_notifiers_extack net/core/dev.c:2033 [inline] call_netdevice_notifiers net/core/dev.c:2047 [inline] dev_close_many+0x304/0x470 net/core/dev.c:1588 unregister_netdevice_many_notify+0x41c/0x17a8 net/core/dev.c:10940 unregister_netdevice_many net/core/dev.c:11023 [inline] unregister_netdevice_queue+0x2d8/0x324 net/core/dev.c:10903 unregister_netdevice include/linux/netdevice.h:3106 [inline] nsim_destroy+0x58/0x16c drivers/net/netdevsim/netdev.c:412 __nsim_dev_port_del+0x140/0x1a0 drivers/net/netdevsim/dev.c:1425 nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1437 [inline] nsim_dev_reload_destroy+0x240/0x43c drivers/net/netdevsim/dev.c:1658 nsim_dev_reload_down+0xac/0xe8 drivers/net/netdevsim/dev.c:965 devlink_reload+0x104/0x52c net/devlink/dev.c:389 devlink_pernet_pre_exit+0x198/0x3cc net/devlink/core.c:288 ops_pre_exit_list net/core/net_namespace.c:160 [inline] cleanup_net+0x488/0x8d0 net/core/net_namespace.c:602 process_one_work+0x694/0x1204 kernel/workqueue.c:2630 process_scheduled_works kernel/workqueue.c:2703 [inline] worker_thread+0x938/0xef4 kernel/workqueue.c:2784 kthread+0x288/0x310 kernel/kthread.c:388 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:857 The buggy address belongs to the object at ffff0000e1fe0400 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 0 bytes inside of allocated 512-byte region [ffff0000e1fe0400, ffff0000e1fe0600) The buggy address belongs to the physical page: page:00000000264bb846 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x121fe0 head:00000000264bb846 order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x5ffc00000000840(slab|head|node=0|zone=2|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 05ffc00000000840 ffff0000c0001c80 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000e1fe0500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff0000e1fe0580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff0000e1fe0600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff0000e1fe0680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000e1fe0700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================