==================================================================
BUG: KASAN: slab-out-of-bounds in ext4_htree_store_dirent+0x19c/0x590 fs/ext4/dir.c:491
Read of size 255 at addr ffff88812df70367 by task syz-executor/6005
CPU: 0 PID: 6005 Comm: syz-executor Not tainted 5.15.178-syzkaller-00034-g5e1b899f19c3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x151/0x1c0 lib/dump_stack.c:106
print_address_description+0x87/0x3b0 mm/kasan/report.c:248
__kasan_report mm/kasan/report.c:427 [inline]
kasan_report+0x179/0x1c0 mm/kasan/report.c:444
check_region_inline mm/kasan/generic.c:-1 [inline]
kasan_check_range+0x293/0x2a0 mm/kasan/generic.c:189
memcpy+0x2d/0x70 mm/kasan/shadow.c:65
ext4_htree_store_dirent+0x19c/0x590 fs/ext4/dir.c:491
ext4_htree_fill_tree+0x87c/0x13e0 fs/ext4/namei.c:1247
ext4_dx_readdir fs/ext4/dir.c:606 [inline]
ext4_readdir+0x2f75/0x3960 fs/ext4/dir.c:142
iterate_dir+0x265/0x600 fs/readdir.c:-1
__do_sys_getdents64 fs/readdir.c:369 [inline]
__se_sys_getdents64+0x1c1/0x460 fs/readdir.c:354
__x64_sys_getdents64+0x7b/0x90 fs/readdir.c:354
x64_sys_call+0x5ae/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:218
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fb70459ead3
Code: c1 66 0f 1f 44 00 00 48 83 c4 08 48 89 ef 5b 5d e9 72 3e f8 ff 66 90 b8 ff ff ff 7f 48 39 c2 48 0f 47 d0 b8 d9 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 05 c3 0f 1f 40 00 48 c7 c2 a8 ff ff ff f7 d8
RSP: 002b:00007ffd08e7d148 EFLAGS: 00000293 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 0000555579b474e0 RCX: 00007fb70459ead3
RDX: 0000000000008000 RSI: 0000555579b474e0 RDI: 0000000000000005
RBP: 0000555579b474b4 R08: 0000000000028b61 R09: 0000000000000000
R10: 00007fb70475bca0 R11: 0000000000000293 R12: ffffffffffffffa8
R13: 0000000000000010 R14: 0000555579b474b0 R15: 00007ffd08e7f400
</TASK>
Allocated by task 5945:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track mm/kasan/common.c:45 [inline]
set_alloc_info mm/kasan/common.c:433 [inline]
__kasan_slab_alloc+0xb1/0xe0 mm/kasan/common.c:466
kasan_slab_alloc include/linux/kasan.h:217 [inline]
slab_post_alloc_hook+0x53/0x2c0 mm/slab.h:550
slab_alloc_node mm/slub.c:3240 [inline]
slab_alloc mm/slub.c:3250 [inline]
kmem_cache_alloc+0xf5/0x250 mm/slub.c:3255
kmem_cache_zalloc include/linux/slab.h:723 [inline]
__kernfs_new_node+0xdb/0x700 fs/kernfs/dir.c:593
kernfs_new_node+0x130/0x230 fs/kernfs/dir.c:669
__kernfs_create_file+0x4a/0x270 fs/kernfs/file.c:987
sysfs_add_file_mode_ns+0x273/0x320 fs/sysfs/file.c:317
create_files fs/sysfs/group.c:64 [inline]
internal_create_group+0x573/0xf00 fs/sysfs/group.c:149
internal_create_groups fs/sysfs/group.c:189 [inline]
sysfs_create_groups+0x5b/0x130 fs/sysfs/group.c:215
device_add_groups drivers/base/core.c:2501 [inline]
device_add_attrs+0x13f/0x490 drivers/base/core.c:2660
device_add+0x5f7/0xf10 drivers/base/core.c:3373
netdev_register_kobject+0x177/0x320 net/core/net-sysfs.c:2014
register_netdevice+0xde9/0x1390 net/core/dev.c:10373
__ip_tunnel_create+0x2b0/0x370 net/ipv4/ip_tunnel.c:267
ip_tunnel_init_net+0x28d/0x750 net/ipv4/ip_tunnel.c:1084
vti_init_net+0x2f/0x140 net/ipv4/ip_vti.c:504
ops_init+0x1cd/0x4a0 net/core/net_namespace.c:138
setup_net+0x34b/0xb50 net/core/net_namespace.c:332
copy_net_ns+0x35f/0x5b0 net/core/net_namespace.c:476
create_new_namespaces+0x416/0x670 kernel/nsproxy.c:110
unshare_nsproxy_namespaces+0x126/0x180 kernel/nsproxy.c:226
ksys_unshare+0x545/0x980 kernel/fork.c:3166
__do_sys_unshare kernel/fork.c:3240 [inline]
__se_sys_unshare kernel/fork.c:3238 [inline]
__x64_sys_unshare+0x38/0x40 kernel/fork.c:3238
x64_sys_call+0x728/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:273
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
The buggy address belongs to the object at ffff88812df70320
which belongs to the cache kernfs_node_cache of size 136
The buggy address is located 71 bytes inside of
136-byte region [ffff88812df70320, ffff88812df703a8)
The buggy address belongs to the page:
page:ffffea0004b7dc00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x12df70
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 ffffea0004854c00 0000000400000002 ffff8881001c4780
raw: 0000000000000000 0000000000140014 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 857, ts 519602390397, free_ts 519480541928
set_page_owner include/linux/page_owner.h:33 [inline]
post_alloc_hook+0x1a3/0x1b0 mm/page_alloc.c:2605
prep_new_page+0x1b/0x110 mm/page_alloc.c:2611
get_page_from_freelist+0x3550/0x35d0 mm/page_alloc.c:4485
__alloc_pages+0x27e/0x8f0 mm/page_alloc.c:5780
alloc_slab_page mm/slub.c:-1 [inline]
allocate_slab mm/slub.c:1932 [inline]
new_slab+0x9a/0x4e0 mm/slub.c:1995
___slab_alloc+0x39e/0x830 mm/slub.c:3028
__slab_alloc+0x4a/0x90 mm/slub.c:3115
slab_alloc_node mm/slub.c:3206 [inline]
slab_alloc mm/slub.c:3250 [inline]
kmem_cache_alloc+0x139/0x250 mm/slub.c:3255
kmem_cache_zalloc include/linux/slab.h:723 [inline]
__kernfs_new_node+0xdb/0x700 fs/kernfs/dir.c:593
kernfs_new_node+0x130/0x230 fs/kernfs/dir.c:669
__kernfs_create_file+0x4a/0x270 fs/kernfs/file.c:987
sysfs_add_file_mode_ns+0x273/0x320 fs/sysfs/file.c:317
create_files fs/sysfs/group.c:64 [inline]
internal_create_group+0x573/0xf00 fs/sysfs/group.c:149
internal_create_groups fs/sysfs/group.c:189 [inline]
sysfs_create_groups+0x5b/0x130 fs/sysfs/group.c:215
device_add_groups drivers/base/core.c:2501 [inline]
device_add_attrs+0x13f/0x490 drivers/base/core.c:2660
device_add+0x5f7/0xf10 drivers/base/core.c:3373
page last free stack trace:
reset_page_owner include/linux/page_owner.h:26 [inline]
free_pages_prepare mm/page_alloc.c:1472 [inline]
free_pcp_prepare mm/page_alloc.c:1544 [inline]
free_unref_page_prepare+0x7c8/0x7d0 mm/page_alloc.c:3534
free_unref_page+0xe8/0x750 mm/page_alloc.c:3616
free_the_page mm/page_alloc.c:805 [inline]
__free_pages+0x61/0xf0 mm/page_alloc.c:5856
__vunmap+0x7c1/0x940 mm/vmalloc.c:2652
__vfree mm/vmalloc.c:2701 [inline]
vfree+0x7f/0xb0 mm/vmalloc.c:2732
kcov_put kernel/kcov.c:417 [inline]
kcov_close+0x2b/0x50 kernel/kcov.c:519
__fput+0x228/0x8c0 fs/file_table.c:311
____fput+0x15/0x20 fs/file_table.c:339
task_work_run+0x129/0x190 kernel/task_work.c:188
exit_task_work include/linux/task_work.h:33 [inline]
do_exit+0xc48/0x2ca0 kernel/exit.c:880
do_group_exit+0x141/0x310 kernel/exit.c:1002
get_signal+0x7a3/0x1630 kernel/signal.c:2907
arch_do_signal_or_restart+0xbd/0x1680 arch/x86/kernel/signal.c:867
handle_signal_work kernel/entry/common.c:154 [inline]
exit_to_user_mode_loop+0xa0/0xe0 kernel/entry/common.c:178
exit_to_user_mode_prepare+0x5a/0xa0 kernel/entry/common.c:214
__syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
syscall_exit_to_user_mode+0x26/0x160 kernel/entry/common.c:307
Memory state around the buggy address:
ffff88812df70280: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
ffff88812df70300: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88812df70380: 00 00 00 00 00 fc fc fc fc fc fc fc fc fa fb fb
^
ffff88812df70400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc
ffff88812df70480: fc fc fc fc fc fc 00 00 00 00 00 00 00 00 00 00
==================================================================
EXT4-fs error (device loop5): htree_dirblock_to_tree:1112: inode #2: block 20: comm syz-executor: bad entry in directory: inode out of bounds - offset=1024, inode=2033530174, rec_len=1012, size=1024 fake=0
EXT4-fs error (device loop5): htree_dirblock_to_tree:1112: inode #2: block 20: comm syz-executor: bad entry in directory: inode out of bounds - offset=1024, inode=2033530174, rec_len=1012, size=1024 fake=0
EXT4-fs error (device loop5): htree_dirblock_to_tree:1112: inode #2: block 20: comm syz-executor: bad entry in directory: inode out of bounds - offset=1024, inode=2033530174, rec_len=1012, size=1024 fake=0
EXT4-fs error (device loop5): htree_dirblock_to_tree:1112: inode #2: block 20: comm syz-executor: bad entry in directory: inode out of bounds - offset=1024, inode=2033530174, rec_len=1012, size=1024 fake=0
EXT4-fs error (device loop5): htree_dirblock_to_tree:1112: inode #2: block 20: comm syz-executor: bad entry in directory: inode out of bounds - offset=1024, inode=2033530174, rec_len=1012, size=1024 fake=0
EXT4-fs error (device loop5): htree_dirblock_to_tree:1112: inode #2: block 20: comm syz-executor: bad entry in directory: inode out of bounds - offset=1024, inode=2033530174, rec_len=1012, size=1024 fake=0
EXT4-fs error (device loop5): htree_dirblock_to_tree:1112: inode #2: block 20: comm syz-executor: bad entry in directory: inode out of bounds - offset=1024, inode=2033530174, rec_len=1012, size=1024 fake=0