================================================================== BUG: KASAN: slab-out-of-bounds in memcpy_from_iter lib/iov_iter.c:73 [inline] BUG: KASAN: slab-out-of-bounds in iterate_bvec include/linux/iov_iter.h:122 [inline] BUG: KASAN: slab-out-of-bounds in iterate_and_advance2 include/linux/iov_iter.h:249 [inline] BUG: KASAN: slab-out-of-bounds in iterate_and_advance include/linux/iov_iter.h:271 [inline] BUG: KASAN: slab-out-of-bounds in __copy_from_iter lib/iov_iter.c:268 [inline] BUG: KASAN: slab-out-of-bounds in copy_page_from_iter_atomic+0x9b2/0x1e70 lib/iov_iter.c:500 Read of size 1024 at addr ffff8881401d0c00 by task kworker/u4:5/1528 CPU: 0 PID: 1528 Comm: kworker/u4:5 Not tainted 6.6.0-syzkaller-10265-gbabe393974de #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023 Workqueue: loop5 loop_workfn Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0x163/0x540 mm/kasan/report.c:475 kasan_report+0x175/0x1b0 mm/kasan/report.c:588 kasan_check_range+0x27e/0x290 mm/kasan/generic.c:187 __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:122 [inline] iterate_and_advance2 include/linux/iov_iter.h:249 [inline] iterate_and_advance include/linux/iov_iter.h:271 [inline] __copy_from_iter lib/iov_iter.c:268 [inline] copy_page_from_iter_atomic+0x9b2/0x1e70 lib/iov_iter.c:500 generic_perform_write+0x392/0x630 mm/filemap.c:3977 shmem_file_write_iter+0xfc/0x120 mm/shmem.c:2865 do_iter_write+0x7ac/0xcb0 fs/read_write.c:860 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:1915 [inline] loop_process_work+0x14c3/0x22a0 drivers/block/loop.c:1950 process_one_work kernel/workqueue.c:2630 [inline] process_scheduled_works+0x90f/0x1400 kernel/workqueue.c:2703 worker_thread+0xa5f/0xff0 kernel/workqueue.c:2784 kthread+0x2d3/0x370 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 Allocated by task 5710: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4f/0x70 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:198 [inline] __do_kmalloc_node mm/slab_common.c:1007 [inline] __kmalloc+0xb9/0x230 mm/slab_common.c:1020 kmalloc include/linux/slab.h:604 [inline] hfsplus_read_wrapper+0x545/0x1330 fs/hfsplus/wrapper.c:178 hfsplus_fill_super+0x38e/0x1c90 fs/hfsplus/super.c:413 mount_bdev+0x237/0x300 fs/super.c:1647 legacy_get_tree+0xef/0x190 fs/fs_context.c:662 vfs_get_tree+0x8c/0x280 fs/super.c:1768 do_new_mount+0x28f/0xae0 fs/namespace.c:3337 do_mount fs/namespace.c:3677 [inline] __do_sys_mount fs/namespace.c:3886 [inline] __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3863 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b Last potentially related work creation: kasan_save_stack+0x3f/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xad/0xc0 mm/kasan/generic.c:492 kvfree_call_rcu+0xf8/0x790 kernel/rcu/tree.c:3386 __ipv6_dev_mc_dec+0x2d6/0x340 net/ipv6/mcast.c:982 addrconf_leave_solict net/ipv6/addrconf.c:2212 [inline] __ipv6_ifa_notify+0x912/0x11e0 net/ipv6/addrconf.c:6233 addrconf_ifdown+0xeea/0x1bb0 net/ipv6/addrconf.c:3928 addrconf_notify+0x3ce/0x1020 notifier_call_chain+0x18c/0x3a0 kernel/notifier.c:93 call_netdevice_notifiers_extack net/core/dev.c:2003 [inline] call_netdevice_notifiers net/core/dev.c:2017 [inline] dev_close_many+0x336/0x4b0 net/core/dev.c:1558 unregister_netdevice_many_notify+0x520/0x1710 net/core/dev.c:10956 unregister_netdevice_many net/core/dev.c:11039 [inline] default_device_exit_batch+0x5c4/0x630 net/core/dev.c:11508 ops_exit_list net/core/net_namespace.c:175 [inline] cleanup_net+0x767/0xb80 net/core/net_namespace.c:614 process_one_work kernel/workqueue.c:2630 [inline] process_scheduled_works+0x90f/0x1400 kernel/workqueue.c:2703 worker_thread+0xa5f/0xff0 kernel/workqueue.c:2784 kthread+0x2d3/0x370 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 The buggy address belongs to the object at ffff8881401d0c00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 0 bytes inside of allocated 512-byte region [ffff8881401d0c00, ffff8881401d0e00) The buggy address belongs to the physical page: page:ffffea0005007400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1401d0 head:ffffea0005007400 order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0 anon flags: 0x57ff00000000840(slab|head|node=1|zone=2|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 057ff00000000840 ffff888012c41c80 0000000000000000 dead000000000001 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 7408552304, free_ts 0 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1e6/0x210 mm/page_alloc.c:1536 prep_new_page mm/page_alloc.c:1543 [inline] get_page_from_freelist+0x31db/0x3360 mm/page_alloc.c:3170 __alloc_pages+0x255/0x670 mm/page_alloc.c:4426 alloc_page_interleave+0x22/0x1d0 mm/mempolicy.c:2136 alloc_slab_page+0x6a/0x160 mm/slub.c:1870 allocate_slab mm/slub.c:2017 [inline] new_slab+0x84/0x2f0 mm/slub.c:2070 ___slab_alloc+0xc85/0x1310 mm/slub.c:3223 __slab_alloc mm/slub.c:3322 [inline] __slab_alloc_node mm/slub.c:3375 [inline] slab_alloc_node mm/slub.c:3468 [inline] __kmem_cache_alloc_node+0x19d/0x270 mm/slub.c:3517 kmalloc_trace+0x2a/0xe0 mm/slab_common.c:1098 kmalloc include/linux/slab.h:600 [inline] kzalloc include/linux/slab.h:721 [inline] drm_atomic_helper_setup_commit+0x1cf/0x1460 drivers/gpu/drm/drm_atomic_helper.c:2286 drm_atomic_helper_commit+0x6a/0xbc0 drivers/gpu/drm/drm_atomic_helper.c:2020 drm_atomic_commit+0x279/0x2c0 drivers/gpu/drm/drm_atomic.c:1513 drm_client_modeset_commit_atomic+0x676/0x7d0 drivers/gpu/drm/drm_client_modeset.c:1051 drm_client_modeset_commit_locked+0xe0/0x510 drivers/gpu/drm/drm_client_modeset.c:1154 pan_display_atomic drivers/gpu/drm/drm_fb_helper.c:1370 [inline] drm_fb_helper_pan_display+0x379/0xc00 drivers/gpu/drm/drm_fb_helper.c:1430 fb_pan_display+0x3b0/0x690 drivers/video/fbdev/core/fbmem.c:191 page_owner free stack trace missing Memory state around the buggy address: ffff8881401d0d00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881401d0d80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8881401d0e00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8881401d0e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8881401d0f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================