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BUG: KASAN: slab-use-after-free in unix_stream_read_actor+0xa3/0xb0 net/unix/af_unix.c:2866
Read of size 4 at addr ffff888111be9184 by task syz-executor.0/2944

CPU: 1 PID: 2944 Comm: syz-executor.0 Not tainted 6.6.0-syzkaller-16159-g3ca112b71f35 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x151/0x1c0 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:364 [inline]
 print_report+0x15d/0x540 mm/kasan/report.c:475
 kasan_report+0x15e/0x190 mm/kasan/report.c:588
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:380
 unix_stream_read_actor+0xa3/0xb0 net/unix/af_unix.c:2866
 unix_stream_recv_urg+0x1b4/0x300 net/unix/af_unix.c:2587
 unix_stream_read_generic+0x21c3/0x22b0 net/unix/af_unix.c:2666
 unix_stream_recvmsg+0x222/0x2b0 net/unix/af_unix.c:2903
 sock_recvmsg_nosec net/socket.c:1044 [inline]
 sock_recvmsg net/socket.c:1066 [inline]
 ____sys_recvmsg+0x292/0x560 net/socket.c:2803
 ___sys_recvmsg net/socket.c:2845 [inline]
 __sys_recvmsg+0x2ec/0x3d0 net/socket.c:2875
 __do_sys_recvmsg net/socket.c:2885 [inline]
 __se_sys_recvmsg net/socket.c:2882 [inline]
 __x64_sys_recvmsg+0x7f/0x90 net/socket.c:2882
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7ffaa447cae9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffaa51bd0c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002f
RAX: ffffffffffffffda RBX: 00007ffaa459c120 RCX: 00007ffaa447cae9
RDX: 0000000040010083 RSI: 0000000020000140 RDI: 0000000000000004
RBP: 00007ffaa44c847a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007ffaa459c120 R15: 00007ffcdd69a0a8
 </TASK>

Allocated by task 2943:
 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:511
 __kasan_slab_alloc+0x69/0x80 mm/kasan/common.c:328
 kasan_slab_alloc include/linux/kasan.h:188 [inline]
 slab_post_alloc_hook+0x68/0x2f0 mm/slab.h:763
 slab_alloc_node mm/slub.c:3478 [inline]
 kmem_cache_alloc_node+0x165/0x300 mm/slub.c:3523
 __alloc_skb+0x177/0x3f0 net/core/skbuff.c:641
 alloc_skb include/linux/skbuff.h:1286 [inline]
 alloc_skb_with_frags+0xcd/0x6e0 net/core/skbuff.c:6331
 sock_alloc_send_pskb+0x915/0xa50 net/core/sock.c:2780
 sock_alloc_send_skb include/net/sock.h:1884 [inline]
 queue_oob+0x102/0x8e0 net/unix/af_unix.c:2147
 unix_stream_sendmsg+0xfcc/0x1220 net/unix/af_unix.c:2301
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 ____sys_sendmsg+0x5c9/0x950 net/socket.c:2584
 ___sys_sendmsg net/socket.c:2638 [inline]
 __sys_sendmsg+0x2ac/0x390 net/socket.c:2667
 __do_sys_sendmsg net/socket.c:2676 [inline]
 __se_sys_sendmsg net/socket.c:2674 [inline]
 __x64_sys_sendmsg+0x7f/0x90 net/socket.c:2674
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

Freed by task 2943:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
 kasan_save_free_info+0x28/0x40 mm/kasan/generic.c:522
 ____kasan_slab_free+0x131/0x180 mm/kasan/common.c:236
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:244
 kasan_slab_free include/linux/kasan.h:164 [inline]
 slab_free_hook mm/slub.c:1800 [inline]
 slab_free_freelist_hook mm/slub.c:1826 [inline]
 slab_free mm/slub.c:3809 [inline]
 kmem_cache_free+0x291/0x510 mm/slub.c:3831
 kfree_skbmem+0x104/0x170
 __kfree_skb net/core/skbuff.c:1073 [inline]
 consume_skb+0xbf/0x260 net/core/skbuff.c:1288
 queue_oob+0x52c/0x8e0 net/unix/af_unix.c:2178
 unix_stream_sendmsg+0xfcc/0x1220 net/unix/af_unix.c:2301
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 ____sys_sendmsg+0x5c9/0x950 net/socket.c:2584
 ___sys_sendmsg net/socket.c:2638 [inline]
 __sys_sendmsg+0x2ac/0x390 net/socket.c:2667
 __do_sys_sendmsg net/socket.c:2676 [inline]
 __se_sys_sendmsg net/socket.c:2674 [inline]
 __x64_sys_sendmsg+0x7f/0x90 net/socket.c:2674
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

The buggy address belongs to the object at ffff888111be9140
 which belongs to the cache skbuff_head_cache of size 232
The buggy address is located 68 bytes inside of
 freed 232-byte region [ffff888111be9140, ffff888111be9228)

The buggy address belongs to the physical page:
page:ffffea000446fa40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x111be9
flags: 0x4000000000000800(slab|zone=1)
page_type: 0xffffffff()
raw: 4000000000000800 ffff888108966640 ffffea00043f90c0 dead000000000004
raw: 0000000000000000 00000000000c000c 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 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 114, tgid 114 (udevadm), ts 5271597862, free_ts 0
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x213/0x220 mm/page_alloc.c:1537
 prep_new_page mm/page_alloc.c:1544 [inline]
 get_page_from_freelist+0x3587/0x3650 mm/page_alloc.c:3312
 __alloc_pages+0x3c2/0x7d0 mm/page_alloc.c:4568
 allocate_slab mm/slub.c:2017 [inline]
 new_slab+0xce/0x4c0 mm/slub.c:2070
 ___slab_alloc+0x781/0xc40 mm/slub.c:3223
 __slab_alloc mm/slub.c:3322 [inline]
 __slab_alloc_node mm/slub.c:3375 [inline]
 slab_alloc_node mm/slub.c:3468 [inline]
 kmem_cache_alloc_node+0x1de/0x300 mm/slub.c:3523
 __alloc_skb+0x177/0x3f0 net/core/skbuff.c:641
 alloc_skb include/linux/skbuff.h:1286 [inline]
 alloc_uevent_skb+0x80/0x230 lib/kobject_uevent.c:290
 uevent_net_broadcast_untagged lib/kobject_uevent.c:326 [inline]
 kobject_uevent_net_broadcast+0x311/0x590 lib/kobject_uevent.c:409
 kobject_uevent_env+0x53c/0x720 lib/kobject_uevent.c:593
 kobject_synth_uevent+0x4eb/0xae0 lib/kobject_uevent.c:208
 uevent_store+0x25/0x60 drivers/base/core.c:2664
 dev_attr_store+0x5c/0x80 drivers/base/core.c:2366
 sysfs_kf_write+0x123/0x140 fs/sysfs/file.c:136
 kernfs_fop_write_iter+0x2c1/0x400 fs/kernfs/file.c:334
 call_write_iter include/linux/fs.h:2020 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x851/0xd90 fs/read_write.c:584
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888111be9080: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc
 ffff888111be9100: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
>ffff888111be9180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff888111be9200: fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc
 ffff888111be9280: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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