================================================================== BUG: KASAN: slab-out-of-bounds in copy_page_from_iter_atomic+0x9a4/0x1104 lib/iov_iter.c:820 Read of size 2048 at addr ffff00011482a800 by task kworker/u4:13/5094 CPU: 0 PID: 5094 Comm: kworker/u4:13 Not tainted 6.1.38-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 Workqueue: loop0 loop_workfn Call trace: dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x174/0x4c0 mm/kasan/report.c:395 kasan_report+0xd4/0x130 mm/kasan/report.c:495 kasan_check_range+0x264/0x2a4 mm/kasan/generic.c:189 memcpy+0x48/0x90 mm/kasan/shadow.c:65 copy_page_from_iter_atomic+0x9a4/0x1104 lib/iov_iter.c:820 generic_perform_write+0x2fc/0x55c mm/filemap.c:3762 __generic_file_write_iter+0x168/0x388 mm/filemap.c:3882 generic_file_write_iter+0xb8/0x2b4 mm/filemap.c:3914 do_iter_write+0x534/0x964 fs/read_write.c:861 vfs_iter_write+0x88/0xac fs/read_write.c:902 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:1882 [inline] loop_process_work+0x15fc/0x256c drivers/block/loop.c:1917 loop_workfn+0x54/0x68 drivers/block/loop.c:1941 process_one_work+0x7ac/0x1404 kernel/workqueue.c:2289 worker_thread+0x8e4/0xfec kernel/workqueue.c:2436 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 Allocated by task 6682: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:52 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:505 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:955 [inline] __kmalloc+0xd8/0x1c4 mm/slab_common.c:968 kmalloc include/linux/slab.h:558 [inline] hfsplus_read_wrapper+0x3ac/0xfcc fs/hfsplus/wrapper.c:178 hfsplus_fill_super+0x2f0/0x166c fs/hfsplus/super.c:413 mount_bdev+0x274/0x370 fs/super.c:1423 hfsplus_mount+0x44/0x58 fs/hfsplus/super.c:641 legacy_get_tree+0xd4/0x16c fs/fs_context.c:610 vfs_get_tree+0x90/0x274 fs/super.c:1553 do_new_mount+0x25c/0x8c4 fs/namespace.c:3040 path_mount+0x590/0xe58 fs/namespace.c:3370 do_mount fs/namespace.c:3383 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount fs/namespace.c:3568 [inline] __arm64_sys_mount+0x45c/0x594 fs/namespace.c:3568 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581 Last potentially related work creation: kasan_save_stack+0x40/0x70 mm/kasan/common.c:45 __kasan_record_aux_stack+0xcc/0xe8 mm/kasan/generic.c:486 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:496 insert_work+0x64/0x384 kernel/workqueue.c:1358 __queue_work+0xd48/0x136c kernel/workqueue.c:1517 delayed_work_timer_fn+0x74/0x90 kernel/workqueue.c:1643 call_timer_fn+0x1c0/0xa1c kernel/time/timer.c:1474 expire_timers kernel/time/timer.c:1514 [inline] __run_timers+0x584/0x718 kernel/time/timer.c:1790 run_timer_softirq+0x7c/0x114 kernel/time/timer.c:1803 __do_softirq+0x30c/0xea0 kernel/softirq.c:571 Second to last potentially related work creation: kasan_save_stack+0x40/0x70 mm/kasan/common.c:45 __kasan_record_aux_stack+0xcc/0xe8 mm/kasan/generic.c:486 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:496 insert_work+0x64/0x384 kernel/workqueue.c:1358 __queue_work+0xd48/0x136c kernel/workqueue.c:1517 delayed_work_timer_fn+0x74/0x90 kernel/workqueue.c:1643 call_timer_fn+0x1c0/0xa1c kernel/time/timer.c:1474 expire_timers kernel/time/timer.c:1514 [inline] __run_timers+0x584/0x718 kernel/time/timer.c:1790 run_timer_softirq+0x7c/0x114 kernel/time/timer.c:1803 __do_softirq+0x30c/0xea0 kernel/softirq.c:571 The buggy address belongs to the object at ffff00011482a800 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 0 bytes inside of 512-byte region [ffff00011482a800, ffff00011482aa00) The buggy address belongs to the physical page: page:0000000024dc2e41 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x154828 head:0000000024dc2e41 order:2 compound_mapcount:0 compound_pincount:0 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 dead000000000100 dead000000000122 ffff0000c0002600 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff00011482a900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff00011482a980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff00011482aa00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff00011482aa80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff00011482ab00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================