================================================================== BUG: KASAN: use-after-free in ext4_read_inline_data fs/ext4/inline.c:210 [inline] BUG: KASAN: use-after-free in ext4_convert_inline_data_nolock+0x311/0xa70 fs/ext4/inline.c:1216 Read of size 52 at addr ffff888127838459 by task syz.4.943/4088 CPU: 1 PID: 4088 Comm: syz.4.943 Not tainted 6.1.84-syzkaller-00005-g96d66062d076 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0x158/0x4e0 mm/kasan/report.c:427 kasan_report+0x13c/0x170 mm/kasan/report.c:531 kasan_check_range+0x294/0x2a0 mm/kasan/generic.c:189 memcpy+0x2d/0x70 mm/kasan/shadow.c:65 ext4_read_inline_data fs/ext4/inline.c:210 [inline] ext4_convert_inline_data_nolock+0x311/0xa70 fs/ext4/inline.c:1216 ext4_try_add_inline_entry+0x7ff/0xb60 fs/ext4/inline.c:1342 ext4_add_entry+0x5e4/0xed0 fs/ext4/namei.c:2409 ext4_add_nondir+0x97/0x290 fs/ext4/namei.c:2796 ext4_create+0x372/0x550 fs/ext4/namei.c:2842 lookup_open fs/namei.c:3483 [inline] open_last_lookups fs/namei.c:3551 [inline] path_openat+0x12ee/0x2d60 fs/namei.c:3781 do_filp_open+0x230/0x480 fs/namei.c:3811 do_sys_openat2+0x13f/0x850 fs/open.c:1341 do_sys_open fs/open.c:1357 [inline] __do_sys_creat fs/open.c:1433 [inline] __se_sys_creat fs/open.c:1427 [inline] __x64_sys_creat+0x11f/0x160 fs/open.c:1427 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f89ca375bd9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f89cb079048 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 RAX: ffffffffffffffda RBX: 00007f89ca503f60 RCX: 00007f89ca375bd9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000440 RBP: 00007f89ca3e4e60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f89ca503f60 R15: 00007ffd165c1988 Allocated by task 837: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 kasan_save_alloc_info+0x1f/0x30 mm/kasan/generic.c:505 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:333 kasan_slab_alloc include/linux/kasan.h:202 [inline] slab_post_alloc_hook+0x53/0x2c0 mm/slab.h:768 slab_alloc_node mm/slub.c:3421 [inline] slab_alloc mm/slub.c:3429 [inline] __kmem_cache_alloc_lru mm/slub.c:3436 [inline] kmem_cache_alloc+0x175/0x2c0 mm/slub.c:3445 kmem_cache_zalloc include/linux/slab.h:682 [inline] __kernfs_new_node+0xdb/0x700 fs/kernfs/dir.c:608 kernfs_new_node+0x130/0x230 fs/kernfs/dir.c:684 kernfs_create_link+0xba/0x210 fs/kernfs/symlink.c:39 sysfs_do_create_link_sd+0x89/0x110 fs/sysfs/symlink.c:44 sysfs_do_create_link fs/sysfs/symlink.c:80 [inline] sysfs_create_link+0x68/0x80 fs/sysfs/symlink.c:92 device_add_class_symlinks drivers/base/core.c:3413 [inline] device_add+0x7bf/0xf10 drivers/base/core.c:3619 netdev_register_kobject+0x177/0x320 net/core/net-sysfs.c:2011 register_netdevice+0xe43/0x1490 net/core/dev.c:10106 veth_newlink+0x7fc/0xc70 drivers/net/veth.c:1775 rtnl_newlink_create net/core/rtnetlink.c:3390 [inline] __rtnl_newlink net/core/rtnetlink.c:3610 [inline] rtnl_newlink+0x14c6/0x2030 net/core/rtnetlink.c:3623 rtnetlink_rcv_msg+0x9a5/0xca0 net/core/rtnetlink.c:6121 netlink_rcv_skb+0x1cd/0x410 net/netlink/af_netlink.c:2518 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:6139 netlink_unicast_kernel net/netlink/af_netlink.c:1327 [inline] netlink_unicast+0x906/0xab0 net/netlink/af_netlink.c:1353 netlink_sendmsg+0xa15/0xd30 net/netlink/af_netlink.c:1875 sock_sendmsg_nosec net/socket.c:716 [inline] __sock_sendmsg net/socket.c:728 [inline] __sys_sendto+0x480/0x600 net/socket.c:2138 __do_sys_sendto net/socket.c:2150 [inline] __se_sys_sendto net/socket.c:2146 [inline] __x64_sys_sendto+0xe5/0x100 net/socket.c:2146 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff8881278383e8 which belongs to the cache kernfs_node_cache of size 136 The buggy address is located 113 bytes inside of 136-byte region [ffff8881278383e8, ffff888127838470) The buggy address belongs to the physical page: page:ffffea00049e0e00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888127838320 pfn:0x127838 flags: 0x4000000000000200(slab|zone=1) raw: 4000000000000200 ffffea00049e0d08 ffffea0004d93d08 ffff8881002a0f00 raw: ffff888127838320 000000000014000c 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 837, tgid 837 (syz-executor), ts 49527387965, free_ts 49212707716 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x213/0x220 mm/page_alloc.c:2590 prep_new_page+0x1b/0x110 mm/page_alloc.c:2597 get_page_from_freelist+0x27ea/0x2870 mm/page_alloc.c:4425 __alloc_pages+0x3a1/0x780 mm/page_alloc.c:5714 alloc_slab_page+0x6c/0xf0 allocate_slab mm/slub.c:1962 [inline] new_slab+0x90/0x3e0 mm/slub.c:2015 ___slab_alloc+0x6f9/0xb80 mm/slub.c:3203 __slab_alloc+0x5d/0xa0 mm/slub.c:3302 slab_alloc_node mm/slub.c:3387 [inline] slab_alloc mm/slub.c:3429 [inline] __kmem_cache_alloc_lru mm/slub.c:3436 [inline] kmem_cache_alloc+0x1b9/0x2c0 mm/slub.c:3445 kmem_cache_zalloc include/linux/slab.h:682 [inline] __kernfs_new_node+0xdb/0x700 fs/kernfs/dir.c:608 kernfs_new_node+0x130/0x230 fs/kernfs/dir.c:684 __kernfs_create_file+0x4a/0x270 fs/kernfs/file.c:1043 sysfs_add_file_mode_ns+0x1c8/0x270 fs/sysfs/file.c:294 create_files fs/sysfs/group.c:64 [inline] internal_create_group+0x545/0xed0 fs/sysfs/group.c:148 sysfs_create_group+0x1f/0x30 fs/sysfs/group.c:174 netdev_queue_add_kobject net/core/net-sysfs.c:1668 [inline] netdev_queue_update_kobjects+0x21c/0x4a0 net/core/net-sysfs.c:1714 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1498 [inline] free_pcp_prepare mm/page_alloc.c:1572 [inline] free_unref_page_prepare+0x83d/0x850 mm/page_alloc.c:3498 free_unref_page+0xb2/0x5c0 mm/page_alloc.c:3594 free_the_page mm/page_alloc.c:798 [inline] __free_pages+0x61/0xf0 mm/page_alloc.c:5803 __vunmap+0x9f3/0xb60 mm/vmalloc.c:2728 __vfree mm/vmalloc.c:2776 [inline] vfree+0x5c/0x80 mm/vmalloc.c:2807 kcov_put kernel/kcov.c:428 [inline] kcov_close+0x2b/0x50 kernel/kcov.c:524 __fput+0x3ab/0x870 fs/file_table.c:320 ____fput+0x15/0x20 fs/file_table.c:348 task_work_run+0x24d/0x2e0 kernel/task_work.c:179 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xbd5/0x2b80 kernel/exit.c:875 do_group_exit+0x21a/0x2d0 kernel/exit.c:1025 __do_sys_exit_group kernel/exit.c:1036 [inline] __se_sys_exit_group kernel/exit.c:1034 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1034 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x63/0xcd Memory state around the buggy address: ffff888127838300: fc fc fc fc fb fb fb fb fb fb fb fb fb fb fb fb ffff888127838380: fb fb fb fb fb fc fc fc fc fc fc fc fc fb fb fb >ffff888127838400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc ^ ffff888127838480: fc fc fc fc fc fc 00 00 00 00 00 00 00 00 00 00 ffff888127838500: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fb ================================================================== EXT4-fs error (device loop4): ext4_check_all_de:655: inode #12: block 7: comm syz.4.943: bad entry in directory: rec_len % 4 != 0 - offset=0, inode=95227824, rec_len=26915, size=108 fake=0