================================================================== BUG: KASAN: slab-out-of-bounds in copy_page_from_iter_atomic+0x8e3/0x1230 lib/iov_iter.c:978 Read of size 2048 at addr ffff88801da68000 by task kworker/u4:6/3620 CPU: 1 PID: 3620 Comm: kworker/u4:6 Not tainted 5.15.158-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Workqueue: loop0 loop_workfn Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106 print_address_description+0x63/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0x16b/0x1c0 mm/kasan/report.c:451 kasan_check_range+0x27e/0x290 mm/kasan/generic.c:189 memcpy+0x25/0x60 mm/kasan/shadow.c:65 copy_page_from_iter_atomic+0x8e3/0x1230 lib/iov_iter.c:978 generic_perform_write+0x33a/0x5b0 mm/filemap.c:3793 __generic_file_write_iter+0x243/0x4f0 mm/filemap.c:3912 generic_file_write_iter+0xa7/0x1b0 mm/filemap.c:3944 do_iter_readv_writev+0x594/0x7a0 do_iter_write+0x1ea/0x760 fs/read_write.c:855 lo_write_bvec+0x297/0x740 drivers/block/loop.c:316 lo_write_simple drivers/block/loop.c:338 [inline] do_req_filebacked drivers/block/loop.c:656 [inline] loop_handle_cmd drivers/block/loop.c:2234 [inline] loop_process_work+0x2309/0x2af0 drivers/block/loop.c:2274 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310 worker_thread+0xaca/0x1280 kernel/workqueue.c:2457 kthread+0x3f6/0x4f0 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:300 Allocated by task 3687: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc+0xba/0xf0 mm/kasan/common.c:513 kasan_kmalloc include/linux/kasan.h:264 [inline] __kmalloc+0x168/0x300 mm/slub.c:4407 kmalloc include/linux/slab.h:596 [inline] hfsplus_read_wrapper+0x4e3/0x13b0 fs/hfsplus/wrapper.c:180 hfsplus_fill_super+0x38a/0x1c90 fs/hfsplus/super.c:413 mount_bdev+0x2c9/0x3f0 fs/super.c:1387 legacy_get_tree+0xeb/0x180 fs/fs_context.c:611 vfs_get_tree+0x88/0x270 fs/super.c:1517 do_new_mount+0x2ba/0xb40 fs/namespace.c:3005 do_mount fs/namespace.c:3348 [inline] __do_sys_mount fs/namespace.c:3556 [inline] __se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3533 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 The buggy address belongs to the object at ffff88801da68000 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 0 bytes inside of 512-byte region [ffff88801da68000, ffff88801da68200) The buggy address belongs to the page: page:ffffea0000769a00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88801da69400 pfn:0x1da68 head:ffffea0000769a00 order:2 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea00007b1408 ffffea0001e55e08 ffff888011c41c80 raw: ffff88801da69400 000000000010000c 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 3520, ts 56608494527, free_ts 20440177478 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x322a/0x33c0 mm/page_alloc.c:4159 __alloc_pages+0x272/0x700 mm/page_alloc.c:5423 alloc_slab_page mm/slub.c:1775 [inline] allocate_slab mm/slub.c:1912 [inline] new_slab+0xbb/0x4b0 mm/slub.c:1975 ___slab_alloc+0x6f6/0xe10 mm/slub.c:3008 __slab_alloc mm/slub.c:3095 [inline] slab_alloc_node mm/slub.c:3186 [inline] __kmalloc_node_track_caller+0x1f6/0x390 mm/slub.c:4958 kmalloc_reserve net/core/skbuff.c:356 [inline] __alloc_skb+0x12c/0x590 net/core/skbuff.c:427 alloc_skb include/linux/skbuff.h:1167 [inline] alloc_uevent_skb+0x74/0x220 lib/kobject_uevent.c:290 uevent_net_broadcast_tagged lib/kobject_uevent.c:351 [inline] kobject_uevent_net_broadcast+0x178/0x560 lib/kobject_uevent.c:412 kobject_uevent_env+0x567/0x8d0 lib/kobject_uevent.c:593 rx_queue_add_kobject net/core/net-sysfs.c:1070 [inline] net_rx_queue_update_kobjects+0x215/0x470 net/core/net-sysfs.c:1110 register_queue_kobjects net/core/net-sysfs.c:1767 [inline] netdev_register_kobject+0x222/0x310 net/core/net-sysfs.c:2018 register_netdevice+0x108c/0x1720 net/core/dev.c:10357 __rtnl_newlink net/core/rtnetlink.c:3501 [inline] rtnl_newlink+0x14bd/0x2070 net/core/rtnetlink.c:3549 rtnetlink_rcv_msg+0x993/0xee0 net/core/rtnetlink.c:5629 netlink_rcv_skb+0x1cf/0x410 net/netlink/af_netlink.c:2505 netlink_unicast_kernel net/netlink/af_netlink.c:1330 [inline] netlink_unicast+0x7b6/0x980 net/netlink/af_netlink.c:1356 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1340 [inline] free_pcp_prepare mm/page_alloc.c:1391 [inline] free_unref_page_prepare+0xc34/0xcf0 mm/page_alloc.c:3317 free_unref_page+0x95/0x2d0 mm/page_alloc.c:3396 free_slab mm/slub.c:2015 [inline] discard_slab mm/slub.c:2021 [inline] __unfreeze_partials+0x1b7/0x210 mm/slub.c:2507 put_cpu_partial+0x132/0x1a0 mm/slub.c:2587 do_slab_free mm/slub.c:3487 [inline] ___cache_free+0xe3/0x100 mm/slub.c:3506 qlist_free_all+0x36/0x90 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x162/0x180 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xc0 mm/kasan/common.c:444 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook+0x53/0x380 mm/slab.h:519 slab_alloc_node mm/slub.c:3220 [inline] slab_alloc mm/slub.c:3228 [inline] kmem_cache_alloc+0xf3/0x280 mm/slub.c:3233 __d_alloc+0x2a/0x700 fs/dcache.c:1745 d_alloc fs/dcache.c:1824 [inline] d_alloc_parallel+0xca/0x1390 fs/dcache.c:2576 __lookup_slow+0x111/0x3d0 fs/namei.c:1648 lookup_slow+0x53/0x70 fs/namei.c:1680 walk_component+0x48c/0x610 fs/namei.c:1976 link_path_walk+0x642/0xd90 Memory state around the buggy address: ffff88801da68100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88801da68180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88801da68200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88801da68280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88801da68300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================