================================================================== BUG: KASAN: slab-out-of-bounds in _copy_to_iter+0x5f4/0xd04 lib/iov_iter.c:669 Write of size 1024 at addr ffff0000d4adac00 by task kworker/u4:3/293 CPU: 0 PID: 293 Comm: kworker/u4:3 Not tainted 5.15.173-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: loop0 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+0xb4/0xe8 mm/kasan/shadow.c:66 _copy_to_iter+0x5f4/0xd04 lib/iov_iter.c:669 __copy_page_to_iter lib/iov_iter.c:864 [inline] copy_page_to_iter+0x850/0xf84 lib/iov_iter.c:889 shmem_file_read_iter+0x52c/0x7b8 mm/shmem.c:2625 do_iter_readv_writev+0x420/0x5f8 do_iter_read+0x1c4/0x684 fs/read_write.c:790 vfs_iter_read+0x88/0xac fs/read_write.c:832 lo_read_simple drivers/block/loop.c:392 [inline] do_req_filebacked drivers/block/loop.c:663 [inline] loop_handle_cmd drivers/block/loop.c:2234 [inline] loop_process_work+0x19f0/0x2798 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 5406: 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+0x494/0xfc8 fs/hfsplus/wrapper.c:183 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 The buggy address belongs to the object at ffff0000d4adac00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 0 bytes inside of 512-byte region [ffff0000d4adac00, ffff0000d4adae00) The buggy address belongs to the page: page:000000004c83384d refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff0000d4ad8400 pfn:0x114ad8 head:000000004c83384d order:2 compound_mapcount:0 compound_pincount:0 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 fffffc0003bd1308 fffffc0003bcf308 ffff0000c0002600 raw: ffff0000d4ad8400 000000000010000c 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000d4adad00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff0000d4adad80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff0000d4adae00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff0000d4adae80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000d4adaf00: 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 wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 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 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