==================================================================
BUG: KASAN: slab-out-of-bounds in ext4_htree_fill_tree+0x1316/0x13e0 fs/ext4/namei.c:1221
Read of size 1 at addr ffff88811a00c365 by task syz-executor/507

CPU: 1 PID: 507 Comm: syz-executor Not tainted 5.10.233-syzkaller-1006618-gfbe98d68b6b3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118
 print_address_description+0x81/0x3b0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:435 [inline]
 kasan_report+0x179/0x1c0 mm/kasan/report.c:452
 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report_generic.c:306
 ext4_htree_fill_tree+0x1316/0x13e0 fs/ext4/namei.c:1221
 ext4_dx_readdir fs/ext4/dir.c:598 [inline]
 ext4_readdir+0x2dde/0x37c0 fs/ext4/dir.c:142
 iterate_dir+0x265/0x580
 __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
 do_syscall_64+0x34/0x70
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f577fd3a693
Code: c1 66 0f 1f 44 00 00 48 83 c4 08 48 89 ef 5b 5d e9 82 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:00007ffc47633918 EFLAGS: 00000293 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 0000555557cd44e0 RCX: 00007f577fd3a693
RDX: 0000000000008000 RSI: 0000555557cd44e0 RDI: 0000000000000005
RBP: 0000555557cd44b4 R08: 0000000000028b61 R09: 0000000000000000
R10: 00007f577fecdca0 R11: 0000000000000293 R12: ffffffffffffffa8
R13: 0000000000000010 R14: 0000555557cd44b0 R15: 0000000000000001

Allocated by task 111:
 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:430 [inline]
 ____kasan_kmalloc+0xdb/0x110 mm/kasan/common.c:509
 __kasan_kmalloc+0x9/0x10 mm/kasan/common.c:518
 kasan_kmalloc include/linux/kasan.h:254 [inline]
 kmem_cache_alloc_trace+0x18a/0x2e0 mm/slub.c:2974
 kmalloc include/linux/slab.h:552 [inline]
 ip_setup_cork+0x223/0x890 net/ipv4/ip_output.c:1275
 ip_append_data+0x140/0x190 net/ipv4/ip_output.c:1328
 icmp_push_reply+0x12d/0x450 net/ipv4/icmp.c:376
 __icmp_send+0x101e/0x15a0 net/ipv4/icmp.c:776
 icmp_send include/net/icmp.h:43 [inline]
 __udp4_lib_rcv+0x1428/0x1d00 net/ipv4/udp.c:2438
 udp_rcv+0x21/0x30 net/ipv4/udp.c:2597
 ip_protocol_deliver_rcu+0x2f4/0x650 net/ipv4/ip_input.c:204
 ip_local_deliver_finish net/ipv4/ip_input.c:231 [inline]
 NF_HOOK include/linux/netfilter.h:299 [inline]
 ip_local_deliver+0x2c6/0x590 net/ipv4/ip_input.c:252
 dst_input include/net/dst.h:443 [inline]
 ip_rcv_finish net/ipv4/ip_input.c:435 [inline]
 NF_HOOK include/linux/netfilter.h:299 [inline]
 ip_rcv+0x16e/0x320 net/ipv4/ip_input.c:546
 __netif_receive_skb_one_core net/core/dev.c:5401 [inline]
 __netif_receive_skb+0x1c6/0x530 net/core/dev.c:5515
 process_backlog+0x31c/0x650 net/core/dev.c:6422
 napi_poll net/core/dev.c:6873 [inline]
 net_rx_action+0x516/0x10d0 net/core/dev.c:6943
 __do_softirq+0x268/0x5bb kernel/softirq.c:309

Freed by task 111:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:45
 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370
 ____kasan_slab_free+0x121/0x160 mm/kasan/common.c:362
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:370
 kasan_slab_free include/linux/kasan.h:220 [inline]
 slab_free_hook mm/slub.c:1595 [inline]
 slab_free_freelist_hook+0xc0/0x190 mm/slub.c:1621
 slab_free mm/slub.c:3203 [inline]
 kfree+0xc3/0x270 mm/slub.c:4191
 ip_cork_release net/ipv4/ip_output.c:1473 [inline]
 __ip_make_skb+0x12cf/0x1a10 net/ipv4/ip_output.c:1581
 ip_finish_skb include/net/ip.h:243 [inline]
 ip_push_pending_frames+0x31/0x190 net/ipv4/ip_output.c:1605
 icmp_push_reply+0x36e/0x450 net/ipv4/icmp.c:395
 __icmp_send+0x101e/0x15a0 net/ipv4/icmp.c:776
 icmp_send include/net/icmp.h:43 [inline]
 __udp4_lib_rcv+0x1428/0x1d00 net/ipv4/udp.c:2438
 udp_rcv+0x21/0x30 net/ipv4/udp.c:2597
 ip_protocol_deliver_rcu+0x2f4/0x650 net/ipv4/ip_input.c:204
 ip_local_deliver_finish net/ipv4/ip_input.c:231 [inline]
 NF_HOOK include/linux/netfilter.h:299 [inline]
 ip_local_deliver+0x2c6/0x590 net/ipv4/ip_input.c:252
 dst_input include/net/dst.h:443 [inline]
 ip_rcv_finish net/ipv4/ip_input.c:435 [inline]
 NF_HOOK include/linux/netfilter.h:299 [inline]
 ip_rcv+0x16e/0x320 net/ipv4/ip_input.c:546
 __netif_receive_skb_one_core net/core/dev.c:5401 [inline]
 __netif_receive_skb+0x1c6/0x530 net/core/dev.c:5515
 process_backlog+0x31c/0x650 net/core/dev.c:6422
 napi_poll net/core/dev.c:6873 [inline]
 net_rx_action+0x516/0x10d0 net/core/dev.c:6943
 __do_softirq+0x268/0x5bb kernel/softirq.c:309

The buggy address belongs to the object at ffff88811a00c300
 which belongs to the cache kmalloc-64 of size 64
The buggy address is located 37 bytes to the right of
 64-byte region [ffff88811a00c300, ffff88811a00c340)
The buggy address belongs to the page:
page:ffffea0004680300 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11a00c
flags: 0x4000000000000200(slab)
raw: 4000000000000200 dead000000000100 dead000000000122 ffff888100043800
raw: 0000000000000000 0000000000200020 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 507, ts 56341758778, free_ts 56341732087
 set_page_owner include/linux/page_owner.h:35 [inline]
 post_alloc_hook mm/page_alloc.c:2456 [inline]
 prep_new_page+0x166/0x180 mm/page_alloc.c:2462
 get_page_from_freelist+0x2d8c/0x2f30 mm/page_alloc.c:4254
 __alloc_pages_nodemask+0x435/0xaf0 mm/page_alloc.c:5348
 allocate_slab mm/slub.c:1808 [inline]
 new_slab+0x80/0x400 mm/slub.c:1869
 new_slab_objects mm/slub.c:2627 [inline]
 ___slab_alloc+0x302/0x4b0 mm/slub.c:2791
 __slab_alloc+0x63/0xa0 mm/slub.c:2831
 slab_alloc_node mm/slub.c:2913 [inline]
 slab_alloc mm/slub.c:2955 [inline]
 kmem_cache_alloc_trace+0x1bd/0x2e0 mm/slub.c:2972
 kmalloc include/linux/slab.h:552 [inline]
 call_modprobe kernel/kmod.c:79 [inline]
 __request_module+0x28c/0x8d0 kernel/kmod.c:170
 xt_request_find_table_lock+0x91/0xf0 net/netfilter/x_tables.c:1253
 get_info net/ipv6/netfilter/ip6_tables.c:981 [inline]
 do_ip6t_get_ctl+0x86c/0x1890 net/ipv6/netfilter/ip6_tables.c:1670
 nf_getsockopt+0x26c/0x290 net/netfilter/nf_sockopt.c:116
 ipv6_getsockopt+0x1dc1/0x3010 net/ipv6/ipv6_sockglue.c:1492
 tcp_getsockopt+0x216/0x4a10 net/ipv4/tcp.c:4047
 sock_common_getsockopt+0x99/0xb0 net/core/sock.c:3290
 __sys_getsockopt+0x298/0x470 net/socket.c:2187
 __do_sys_getsockopt net/socket.c:2202 [inline]
 __se_sys_getsockopt net/socket.c:2199 [inline]
 __x64_sys_getsockopt+0xbf/0xd0 net/socket.c:2199
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:28 [inline]
 free_pages_prepare mm/page_alloc.c:1349 [inline]
 free_pcp_prepare mm/page_alloc.c:1421 [inline]
 free_unref_page_prepare+0x2ae/0x2d0 mm/page_alloc.c:3336
 free_unref_page mm/page_alloc.c:3391 [inline]
 free_the_page+0x9e/0x370 mm/page_alloc.c:5407
 __free_pages+0x67/0xc0 mm/page_alloc.c:5418
 __vunmap+0x7bc/0x8f0 mm/vmalloc.c:2301
 __vfree mm/vmalloc.c:2349 [inline]
 vfree+0x5c/0x80 mm/vmalloc.c:2380
 copy_entries_to_user net/ipv6/netfilter/ip6_tables.c:884 [inline]
 get_entries net/ipv6/netfilter/ip6_tables.c:1041 [inline]
 do_ip6t_get_ctl+0x11da/0x1890 net/ipv6/netfilter/ip6_tables.c:1679
 nf_getsockopt+0x26c/0x290 net/netfilter/nf_sockopt.c:116
 ipv6_getsockopt+0x1dc1/0x3010 net/ipv6/ipv6_sockglue.c:1492
 tcp_getsockopt+0x216/0x4a10 net/ipv4/tcp.c:4047
 sock_common_getsockopt+0x99/0xb0 net/core/sock.c:3290
 __sys_getsockopt+0x298/0x470 net/socket.c:2187
 __do_sys_getsockopt net/socket.c:2202 [inline]
 __se_sys_getsockopt net/socket.c:2199 [inline]
 __x64_sys_getsockopt+0xbf/0xd0 net/socket.c:2199
 do_syscall_64+0x34/0x70
 entry_SYSCALL_64_after_hwframe+0x61/0xcb

Memory state around the buggy address:
 ffff88811a00c200: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff88811a00c280: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
>ffff88811a00c300: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
                                                       ^
 ffff88811a00c380: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff88811a00c400: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
==================================================================
EXT4-fs error (device loop3): htree_dirblock_to_tree:1092: 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