EXT4-fs (loop4): 1 truncate cleaned up
EXT4-fs (loop4): mounted filesystem without journal. Opts: nogrpid,resuid=0x000000000000ee01,debug_want_extra_isize=0x0000000000000068,debug,nombcache,quota,,errors=continue
==================================================================
BUG: KASAN: slab-out-of-bounds in ext4_search_dir+0xf7/0x1b0 fs/ext4/namei.c:1516
Read of size 1 at addr ffff88810c27a900 by task syz.4.22/524

CPU: 0 PID: 524 Comm: syz.4.22 Not tainted 5.10.226-syzkaller-1003449-g6a01908517df #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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_search_dir+0xf7/0x1b0 fs/ext4/namei.c:1516
 ext4_find_inline_entry+0x4b6/0x5e0 fs/ext4/inline.c:1700
 __ext4_find_entry+0x2b0/0x1990 fs/ext4/namei.c:1589
 ext4_lookup_entry fs/ext4/namei.c:1744 [inline]
 ext4_lookup+0x3c6/0xaa0 fs/ext4/namei.c:1812
 __lookup_hash+0x143/0x290 fs/namei.c:1541
 filename_create+0x202/0x750 fs/namei.c:3608
 user_path_create fs/namei.c:3665 [inline]
 do_mknodat+0x187/0x450 fs/namei.c:3729
 __do_sys_mknod fs/namei.c:3768 [inline]
 __se_sys_mknod fs/namei.c:3766 [inline]
 __x64_sys_mknod+0x80/0x90 fs/namei.c:3766
 do_syscall_64+0x34/0x70
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f6d4e38e719
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:00007f6d4de0f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000085
RAX: ffffffffffffffda RBX: 00007f6d4e545f80 RCX: 00007f6d4e38e719
RDX: 0000000000000709 RSI: 0000000000000000 RDI: 0000000020000000
RBP: 00007f6d4e40132e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f6d4e545f80 R15: 00007ffc95ec3408

Allocated by task 519:
 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]
 __kmalloc+0x1aa/0x330 mm/slub.c:4033
 kmalloc include/linux/slab.h:557 [inline]
 kzalloc include/linux/slab.h:664 [inline]
 fib_create_info+0x88e/0x1e90 net/ipv4/fib_semantics.c:1479
 fib_table_insert+0x160/0x1eb0 net/ipv4/fib_trie.c:1189
 fib_magic net/ipv4/fib_frontend.c:1093 [inline]
 fib_add_ifaddr+0x42c/0x1a40 net/ipv4/fib_frontend.c:1115
 fib_inetaddr_event+0x159/0x310 net/ipv4/fib_frontend.c:1431
 notifier_call_chain kernel/notifier.c:83 [inline]
 blocking_notifier_call_chain+0xbb/0x140 kernel/notifier.c:337
 __inet_insert_ifa+0x906/0xb50 net/ipv4/devinet.c:553
 inet_rtm_newaddr+0x8f5/0x16c0 net/ipv4/devinet.c:957
 rtnetlink_rcv_msg+0x955/0xc50 net/core/rtnetlink.c:5607
 netlink_rcv_skb+0x1cf/0x410 net/netlink/af_netlink.c:2499
 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5625
 netlink_unicast_kernel net/netlink/af_netlink.c:1322 [inline]
 netlink_unicast+0x8df/0xac0 net/netlink/af_netlink.c:1348
 netlink_sendmsg+0xa46/0xd00 net/netlink/af_netlink.c:1916
 sock_sendmsg_nosec net/socket.c:652 [inline]
 __sock_sendmsg net/socket.c:664 [inline]
 __sys_sendto+0x545/0x700 net/socket.c:2006
 __do_sys_sendto net/socket.c:2018 [inline]
 __se_sys_sendto net/socket.c:2014 [inline]
 __x64_sys_sendto+0xe5/0x100 net/socket.c:2014
 do_syscall_64+0x34/0x70
 entry_SYSCALL_64_after_hwframe+0x61/0xcb

The buggy address belongs to the object at ffff88810c27a800
 which belongs to the cache kmalloc-256 of size 256
The buggy address is located 0 bytes to the right of
 256-byte region [ffff88810c27a800, ffff88810c27a900)
The buggy address belongs to the page:
page:ffffea0004309e80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10c27a
head:ffffea0004309e80 order:1 compound_mapcount:0
flags: 0x4000000000010200(slab|head)
raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100043200
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 1, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 519, ts 53482245960, free_ts 53330122628
 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]
 __kmalloc+0x204/0x330 mm/slub.c:4029
 kmalloc include/linux/slab.h:557 [inline]
 kzalloc include/linux/slab.h:664 [inline]
 fib_create_info+0x88e/0x1e90 net/ipv4/fib_semantics.c:1479
 fib_table_insert+0x160/0x1eb0 net/ipv4/fib_trie.c:1189
 fib_magic net/ipv4/fib_frontend.c:1093 [inline]
 fib_add_ifaddr+0x42c/0x1a40 net/ipv4/fib_frontend.c:1115
 fib_inetaddr_event+0x159/0x310 net/ipv4/fib_frontend.c:1431
 notifier_call_chain kernel/notifier.c:83 [inline]
 blocking_notifier_call_chain+0xbb/0x140 kernel/notifier.c:337
 __inet_insert_ifa+0x906/0xb50 net/ipv4/devinet.c:553
 inet_rtm_newaddr+0x8f5/0x16c0 net/ipv4/devinet.c:957
 rtnetlink_rcv_msg+0x955/0xc50 net/core/rtnetlink.c:5607
 netlink_rcv_skb+0x1cf/0x410 net/netlink/af_netlink.c:2499
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_pages_ok+0x82c/0x850 mm/page_alloc.c:1629
 free_the_page+0x76/0x370 mm/page_alloc.c:5409
 __free_pages+0x67/0xc0 mm/page_alloc.c:5418
 __free_slab+0xcf/0x190 mm/slub.c:1894
 free_slab mm/slub.c:1909 [inline]
 discard_slab mm/slub.c:1915 [inline]
 unfreeze_partials+0x15e/0x190 mm/slub.c:2410
 put_cpu_partial+0xbf/0x180 mm/slub.c:2446
 __slab_free+0x2c8/0x3a0 mm/slub.c:3095
 do_slab_free mm/slub.c:3191 [inline]
 ___cache_free+0x111/0x130 mm/slub.c:3210
 qlink_free+0x50/0x90 mm/kasan/quarantine.c:157
 qlist_free_all+0x47/0xb0 mm/kasan/quarantine.c:176
 kasan_quarantine_reduce+0x15a/0x170 mm/kasan/quarantine.c:283
 __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:440
 kasan_slab_alloc include/linux/kasan.h:244 [inline]
 slab_post_alloc_hook+0x61/0x2f0 mm/slab.h:583
 slab_alloc_node mm/slub.c:2947 [inline]
 slab_alloc mm/slub.c:2955 [inline]
 kmem_cache_alloc+0x168/0x2e0 mm/slub.c:2960
 sk_prot_alloc+0x5f/0x370 net/core/sock.c:1710
 sk_alloc+0x38/0x4d0 net/core/sock.c:1774

Memory state around the buggy address:
 ffff88810c27a800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88810c27a880: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc
>ffff88810c27a900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff88810c27a980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88810c27aa00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
EXT4-fs error (device loop4): ext4_find_dest_de:2077: inode #12: block 7: comm syz.4.22: bad entry in directory: directory entry overrun - offset=0, inode=1793120026, rec_len=34652, size=56 fake=0