================================================================== BUG: KASAN: slab-out-of-bounds in copy_page_from_iter_atomic+0x834/0xffc lib/iov_iter.c:978 Read of size 4096 at addr ffff0000eb61c000 by task kworker/u4:1/136 CPU: 1 PID: 136 Comm: kworker/u4:1 Not tainted 5.15.173-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: loop4 loop_workfn Call trace: dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106 print_address_description+0x7c/0x3f0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0x174/0x1e4 mm/kasan/report.c:451 kasan_check_range+0x274/0x2b4 mm/kasan/generic.c:189 memcpy+0x90/0xe8 mm/kasan/shadow.c:65 copy_page_from_iter_atomic+0x834/0xffc lib/iov_iter.c:978 generic_perform_write+0x2d0/0x520 mm/filemap.c:3793 __generic_file_write_iter+0x230/0x454 mm/filemap.c:3912 generic_file_write_iter+0xb4/0x1b8 mm/filemap.c:3944 do_iter_readv_writev+0x420/0x5f8 do_iter_write+0x1b8/0x66c fs/read_write.c:855 vfs_iter_write+0x88/0xac fs/read_write.c:896 lo_write_bvec+0x394/0xb4c 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+0x1f24/0x2798 drivers/block/loop.c:2274 loop_workfn+0x54/0x68 drivers/block/loop.c:2298 process_one_work+0x790/0x11b8 kernel/workqueue.c:2310 worker_thread+0x910/0x1034 kernel/workqueue.c:2457 kthread+0x37c/0x45c kernel/kthread.c:334 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870 Allocated by task 5385: 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+0xbc/0xfc mm/kasan/common.c:513 __kasan_kmalloc+0x10/0x1c mm/kasan/common.c:522 kasan_kmalloc include/linux/kasan.h:264 [inline] __kmalloc+0x29c/0x4c8 mm/slub.c:4407 kmalloc include/linux/slab.h:596 [inline] hfsplus_read_wrapper+0x3b8/0xfc8 fs/hfsplus/wrapper.c:180 hfsplus_fill_super+0x2f0/0x167c fs/hfsplus/super.c:413 mount_bdev+0x274/0x370 fs/super.c:1400 hfsplus_mount+0x44/0x58 fs/hfsplus/super.c:641 legacy_get_tree+0xd4/0x16c fs/fs_context.c:611 vfs_get_tree+0x90/0x274 fs/super.c:1530 do_new_mount+0x278/0x8fc fs/namespace.c:3012 path_mount+0x594/0x101c fs/namespace.c:3342 do_mount fs/namespace.c:3355 [inline] __do_sys_mount fs/namespace.c:3563 [inline] __se_sys_mount fs/namespace.c:3540 [inline] __arm64_sys_mount+0x510/0x5e0 fs/namespace.c:3540 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 Last potentially related work creation: kasan_save_stack+0x38/0x68 mm/kasan/common.c:38 kasan_record_aux_stack+0xd4/0x11c mm/kasan/generic.c:348 __call_rcu kernel/rcu/tree.c:3007 [inline] call_rcu+0x118/0xb40 kernel/rcu/tree.c:3087 fib6_info_release include/net/ip6_fib.h:339 [inline] ip6_route_info_create+0x818/0xf28 net/ipv6/route.c:3843 ip6_route_add+0x38/0x17c net/ipv6/route.c:3857 addrconf_add_mroute net/ipv6/addrconf.c:2511 [inline] addrconf_add_dev+0x2b0/0x46c net/ipv6/addrconf.c:2529 inet6_addr_add+0x170/0x81c net/ipv6/addrconf.c:2967 inet6_rtm_newaddr+0x6a4/0x1de4 net/ipv6/addrconf.c:4954 rtnetlink_rcv_msg+0xa74/0xdac net/core/rtnetlink.c:5647 netlink_rcv_skb+0x20c/0x3b8 net/netlink/af_netlink.c:2504 rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:5665 netlink_unicast_kernel net/netlink/af_netlink.c:1326 [inline] netlink_unicast+0x664/0x938 net/netlink/af_netlink.c:1352 netlink_sendmsg+0x844/0xb38 net/netlink/af_netlink.c:1920 sock_sendmsg_nosec net/socket.c:704 [inline] __sock_sendmsg net/socket.c:716 [inline] __sys_sendto+0x388/0x4d0 net/socket.c:2063 __do_sys_sendto net/socket.c:2075 [inline] __se_sys_sendto net/socket.c:2071 [inline] __arm64_sys_sendto+0xd8/0xf8 net/socket.c:2071 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 The buggy address belongs to the object at ffff0000eb61c000 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 0 bytes inside of 512-byte region [ffff0000eb61c000, ffff0000eb61c200) The buggy address belongs to the page: page:000000004f7fd3d3 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff0000eb61e400 pfn:0x12b61c head:000000004f7fd3d3 order:2 compound_mapcount:0 compound_pincount:0 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 ffff0000c0000448 fffffc0003acfd08 ffff0000c0002600 raw: ffff0000eb61e400 000000000010000b 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000eb61c100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff0000eb61c180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff0000eb61c200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff0000eb61c280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000eb61c300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4 hfsplus: b-tree write err: -5, ino 4