================================================================== BUG: KASAN: use-after-free in memcpy_from_iter lib/iov_iter.c:73 [inline] BUG: KASAN: use-after-free in iterate_bvec include/linux/iov_iter.h:123 [inline] BUG: KASAN: use-after-free in iterate_and_advance2 include/linux/iov_iter.h:304 [inline] BUG: KASAN: use-after-free in iterate_and_advance include/linux/iov_iter.h:328 [inline] BUG: KASAN: use-after-free in __copy_from_iter lib/iov_iter.c:249 [inline] BUG: KASAN: use-after-free in copy_page_from_iter_atomic+0x98c/0x1e30 lib/iov_iter.c:483 Read of size 4096 at addr ffff8880316d7000 by task kworker/u8:0/11 CPU: 1 UID: 0 PID: 11 Comm: kworker/u8:0 Not tainted 6.13.0-syzkaller-08291-g805ba04cb7cc #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Workqueue: loop2 loop_workfn Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x169/0x550 mm/kasan/report.c:489 kasan_report+0x143/0x180 mm/kasan/report.c:602 kasan_check_range+0x282/0x290 mm/kasan/generic.c:189 __asan_memcpy+0x29/0x70 mm/kasan/shadow.c:105 memcpy_from_iter lib/iov_iter.c:73 [inline] iterate_bvec include/linux/iov_iter.h:123 [inline] iterate_and_advance2 include/linux/iov_iter.h:304 [inline] iterate_and_advance include/linux/iov_iter.h:328 [inline] __copy_from_iter lib/iov_iter.c:249 [inline] copy_page_from_iter_atomic+0x98c/0x1e30 lib/iov_iter.c:483 copy_folio_from_iter_atomic include/linux/uio.h:210 [inline] generic_perform_write+0x675/0x990 mm/filemap.c:4201 shmem_file_write_iter+0xf9/0x120 mm/shmem.c:3454 do_iter_readv_writev+0x71a/0x9d0 vfs_iter_write+0x23e/0x600 fs/read_write.c:974 lo_write_bvec drivers/block/loop.c:245 [inline] lo_write_simple drivers/block/loop.c:266 [inline] do_req_filebacked drivers/block/loop.c:520 [inline] loop_handle_cmd drivers/block/loop.c:1926 [inline] loop_process_work+0x1429/0x21c0 drivers/block/loop.c:1961 process_one_work kernel/workqueue.c:3236 [inline] process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3317 worker_thread+0x870/0xd30 kernel/workqueue.c:3398 kthread+0x7a9/0x920 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8880316d7c80 pfn:0x316d7 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000000 ffffea0000a97a48 ffffea0000930048 0000000000000000 raw: ffff8880316d7c80 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as freed page last allocated via order 0, migratetype Unmovable, gfp_mask 0xdc0(GFP_KERNEL|__GFP_ZERO), pid 6107, tgid 6106 (syz.2.26), ts 92355219860, free_ts 93182610102 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f4/0x240 mm/page_alloc.c:1551 prep_new_page mm/page_alloc.c:1559 [inline] get_page_from_freelist+0x3651/0x37a0 mm/page_alloc.c:3477 __alloc_frozen_pages_noprof+0x292/0x710 mm/page_alloc.c:4739 alloc_pages_mpol+0x311/0x660 mm/mempolicy.c:2270 alloc_frozen_pages_noprof mm/mempolicy.c:2341 [inline] alloc_pages_noprof+0x121/0x190 mm/mempolicy.c:2361 lbmLogInit fs/jfs/jfs_logmgr.c:1816 [inline] lmLogInit+0x37a/0x1c90 fs/jfs/jfs_logmgr.c:1270 open_inline_log fs/jfs/jfs_logmgr.c:1175 [inline] lmLogOpen+0x55e/0x1040 fs/jfs/jfs_logmgr.c:1069 jfs_mount_rw+0xf1/0x6a0 fs/jfs/jfs_mount.c:257 jfs_fill_super+0x775/0xd90 fs/jfs/super.c:532 get_tree_bdev_flags+0x48c/0x5c0 fs/super.c:1636 vfs_get_tree+0x90/0x2b0 fs/super.c:1814 do_new_mount+0x2be/0xb40 fs/namespace.c:3560 do_mount fs/namespace.c:3900 [inline] __do_sys_mount fs/namespace.c:4111 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4088 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 5819 tgid 5819 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_frozen_pages+0xe04/0x10e0 mm/page_alloc.c:2660 lbmLogShutdown fs/jfs/jfs_logmgr.c:1864 [inline] lmLogShutdown+0x4fc/0x970 fs/jfs/jfs_logmgr.c:1684 lmLogClose+0x297/0x530 fs/jfs/jfs_logmgr.c:1460 jfs_umount+0x2ce/0x3a0 fs/jfs/jfs_umount.c:114 jfs_put_super+0x8a/0x190 fs/jfs/super.c:194 generic_shutdown_super+0x139/0x2d0 fs/super.c:642 kill_block_super+0x44/0x90 fs/super.c:1710 deactivate_locked_super+0xc4/0x130 fs/super.c:473 cleanup_mnt+0x41f/0x4b0 fs/namespace.c:1413 task_work_run+0x24f/0x310 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x13f/0x340 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff8880316d6f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880316d6f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880316d7000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff8880316d7080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff8880316d7100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================