================================================================== BUG: KASAN: slab-out-of-bounds in _copy_to_iter+0x738/0xe58 lib/iov_iter.c:527 Write of size 2048 at addr ffff0000c3080800 by task kworker/u4:1/11 CPU: 0 PID: 11 Comm: kworker/u4:1 Not tainted 6.1.83-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Workqueue: loop0 loop_rootcg_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+0x60/0x90 mm/kasan/shadow.c:66 _copy_to_iter+0x738/0xe58 lib/iov_iter.c:527 copy_page_to_iter+0x218/0x344 lib/iov_iter.c:725 shmem_file_read_iter+0x4d0/0xa04 mm/shmem.c:2692 do_iter_read+0x578/0x998 fs/read_write.c:796 vfs_iter_read+0x88/0xac fs/read_write.c:838 lo_read_simple drivers/block/loop.c:288 [inline] do_req_filebacked drivers/block/loop.c:498 [inline] loop_handle_cmd drivers/block/loop.c:1909 [inline] loop_process_work+0xe7c/0x24a4 drivers/block/loop.c:1944 loop_rootcg_workfn+0x28/0x38 drivers/block/loop.c:1975 process_one_work+0x7ac/0x1404 kernel/workqueue.c:2292 worker_thread+0x8e4/0xfec kernel/workqueue.c:2439 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:864 Allocated by task 4228: 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:561 [inline] hfsplus_read_wrapper+0x46c/0xfcc fs/hfsplus/wrapper.c:181 hfsplus_fill_super+0x2f0/0x166c fs/hfsplus/super.c:413 mount_bdev+0x274/0x370 fs/super.c:1432 hfsplus_mount+0x44/0x58 fs/hfsplus/super.c:641 legacy_get_tree+0xd4/0x16c fs/fs_context.c:632 vfs_get_tree+0x90/0x274 fs/super.c:1562 do_new_mount+0x278/0x8fc fs/namespace.c:3051 path_mount+0x590/0xe5c fs/namespace.c:3381 do_mount fs/namespace.c:3394 [inline] __do_sys_mount fs/namespace.c:3602 [inline] __se_sys_mount fs/namespace.c:3579 [inline] __arm64_sys_mount+0x45c/0x594 fs/namespace.c:3579 __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:585 The buggy address belongs to the object at ffff0000c3080800 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 0 bytes inside of 512-byte region [ffff0000c3080800, ffff0000c3080a00) The buggy address belongs to the physical page: page:00000000bcf74046 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x103080 head:00000000bcf74046 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: ffff0000c3080900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff0000c3080980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff0000c3080a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff0000c3080a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000c3080b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================