EXT4-fs error (device loop1): ext4_readdir:260: inode #2: block 48: comm syz-executor: path /15/file0: bad entry in directory: rec_len is smaller than minimal - offset=980, inode=0, rec_len=0, size=1024 fake=0
==================================================================
BUG: KASAN: slab-use-after-free in ext4_read_inline_data fs/ext4/inline.c:209 [inline]
BUG: KASAN: slab-use-after-free in ext4_read_inline_dir+0x48b/0xdf0 fs/ext4/inline.c:1483
Read of size 836 at addr ffff888011913205 by task syz-executor/6832

CPU: 0 UID: 0 PID: 6832 Comm: syz-executor Not tainted 6.11.0-rc5-syzkaller-00079-g928f79a188aa #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:93 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0x169/0x550 mm/kasan/report.c:488
 kasan_report+0x143/0x180 mm/kasan/report.c:601
 kasan_check_range+0x282/0x290 mm/kasan/generic.c:189
 __asan_memcpy+0x29/0x70 mm/kasan/shadow.c:105
 ext4_read_inline_data fs/ext4/inline.c:209 [inline]
 ext4_read_inline_dir+0x48b/0xdf0 fs/ext4/inline.c:1483
 ext4_readdir+0x3bb/0x3500 fs/ext4/dir.c:158
 iterate_dir+0x57a/0x810 fs/readdir.c:108
 __do_sys_getdents64 fs/readdir.c:407 [inline]
 __se_sys_getdents64+0x20d/0x4f0 fs/readdir.c:392
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7feae9fac093
Code: c1 66 0f 1f 44 00 00 48 83 c4 08 48 89 ef 5b 5d e9 32 43 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:00007fff2c2a6f18 EFLAGS: 00000293 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 00005555826c0640 RCX: 00007feae9fac093
RDX: 0000000000008000 RSI: 00005555826c0640 RDI: 0000000000000006
RBP: 00005555826c0614 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000001000 R11: 0000000000000293 R12: ffffffffffffffa8
R13: 0000000000000016 R14: 00005555826c0610 R15: 00007fff2c2aa2b0
 </TASK>

Allocated by task 4668:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 unpoison_slab_object mm/kasan/common.c:312 [inline]
 __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:338
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook mm/slub.c:3988 [inline]
 slab_alloc_node mm/slub.c:4037 [inline]
 kmem_cache_alloc_node_noprof+0x16b/0x320 mm/slub.c:4080
 __alloc_skb+0x1c3/0x440 net/core/skbuff.c:664
 netlink_sendmsg+0x638/0xcb0 net/netlink/af_netlink.c:1876
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0x221/0x270 net/socket.c:745
 ____sys_sendmsg+0x525/0x7d0 net/socket.c:2597
 ___sys_sendmsg net/socket.c:2651 [inline]
 __sys_sendmsg+0x2b0/0x3a0 net/socket.c:2680
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 6699:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579
 poison_slab_object+0xe0/0x150 mm/kasan/common.c:240
 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256
 kasan_slab_free include/linux/kasan.h:184 [inline]
 slab_free_hook mm/slub.c:2252 [inline]
 slab_free mm/slub.c:4473 [inline]
 kmem_cache_free+0x145/0x350 mm/slub.c:4548
 netlink_recvmsg+0x60a/0x11d0 net/netlink/af_netlink.c:1979
 sock_recvmsg_nosec net/socket.c:1046 [inline]
 sock_recvmsg+0x22f/0x280 net/socket.c:1068
 ____sys_recvmsg+0x1db/0x470 net/socket.c:2816
 ___sys_recvmsg net/socket.c:2858 [inline]
 __sys_recvmsg+0x2f0/0x3e0 net/socket.c:2888
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888011913140
 which belongs to the cache skbuff_head_cache of size 240
The buggy address is located 197 bytes inside of
 freed 240-byte region [ffff888011913140, ffff888011913230)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11913
ksm flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xfdffffff(slab)
raw: 00fff00000000000 ffff888018efb780 ffffea0001f546c0 dead000000000003
raw: 0000000000000000 00000000000c000c 00000001fdffffff 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 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 0, tgid 0 (swapper/0), ts 60570349411, free_ts 60563259776
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1493
 prep_new_page mm/page_alloc.c:1501 [inline]
 get_page_from_freelist+0x2e4c/0x2f10 mm/page_alloc.c:3439
 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4695
 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline]
 alloc_pages_node_noprof include/linux/gfp.h:296 [inline]
 alloc_slab_page+0x5f/0x120 mm/slub.c:2321
 allocate_slab+0x5a/0x2f0 mm/slub.c:2484
 new_slab mm/slub.c:2537 [inline]
 ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3723
 __kmem_cache_alloc_bulk mm/slub.c:4762 [inline]
 kmem_cache_alloc_bulk_noprof+0x202/0x790 mm/slub.c:4834
 napi_skb_cache_get+0x3e0/0x6f0 net/core/skbuff.c:351
 __napi_build_skb net/core/skbuff.c:533 [inline]
 napi_alloc_skb+0x4e3/0xa00 net/core/skbuff.c:856
 page_to_skb+0x276/0x9b0 drivers/net/virtio_net.c:797
 receive_mergeable drivers/net/virtio_net.c:2256 [inline]
 receive_buf+0x3af/0x16e0 drivers/net/virtio_net.c:2394
 virtnet_receive_packets drivers/net/virtio_net.c:2699 [inline]
 virtnet_receive drivers/net/virtio_net.c:2723 [inline]
 virtnet_poll+0x2688/0x3870 drivers/net/virtio_net.c:2818
 __napi_poll+0xcb/0x490 net/core/dev.c:6772
 napi_poll net/core/dev.c:6841 [inline]
 net_rx_action+0x89b/0x1240 net/core/dev.c:6963
 handle_softirqs+0x2c4/0x970 kernel/softirq.c:554
 __do_softirq kernel/softirq.c:588 [inline]
 invoke_softirq kernel/softirq.c:428 [inline]
 __irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637
page last free pid 5200 tgid 5200 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1094 [inline]
 free_unref_page+0xd19/0xea0 mm/page_alloc.c:2612
 skb_free_frag include/linux/skbuff.h:3383 [inline]
 skb_free_head net/core/skbuff.c:1094 [inline]
 skb_release_data+0x6b2/0x880 net/core/skbuff.c:1123
 skb_release_all net/core/skbuff.c:1188 [inline]
 __kfree_skb+0x55/0x70 net/core/skbuff.c:1202
 tcp_rcv_established+0x10a5/0x2020 net/ipv4/tcp_input.c:6140
 tcp_v4_do_rcv+0x96d/0xc70 net/ipv4/tcp_ipv4.c:1911
 sk_backlog_rcv include/net/sock.h:1111 [inline]
 __release_sock+0x214/0x350 net/core/sock.c:3004
 __sk_flush_backlog+0x36/0xc0 net/core/sock.c:3024
 sk_flush_backlog include/net/sock.h:1174 [inline]
 tcp_sendmsg_locked+0x3cbb/0x4e10 net/ipv4/tcp.c:1160
 tcp_sendmsg+0x30/0x50 net/ipv4/tcp.c:1354
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0x1a6/0x270 net/socket.c:745
 sock_write_iter+0x2dd/0x400 net/socket.c:1160
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0xa72/0xc90 fs/read_write.c:590
 ksys_write+0x1a0/0x2c0 fs/read_write.c:643
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888011913100: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
 ffff888011913180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888011913200: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff888011913280: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888011913300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc
==================================================================