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BUG: KASAN: use-after-free in unix_stream_read_actor+0xa3/0xb0 net/unix/af_unix.c:2809
Read of size 4 at addr ffff88810c2c0b84 by task syz-executor.0/898

CPU: 1 PID: 898 Comm: syz-executor.0 Not tainted 5.15.137-syzkaller #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+0x151/0x1b7 lib/dump_stack.c:106
 print_address_description+0x87/0x3a0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0x177/0x1c0 mm/kasan/report.c:451
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308
 unix_stream_read_actor+0xa3/0xb0 net/unix/af_unix.c:2809
 unix_stream_recv_urg+0x1b4/0x2f0 net/unix/af_unix.c:2535
 unix_stream_read_generic+0x221b/0x2310 net/unix/af_unix.c:2615
 unix_stream_recvmsg+0x22d/0x2c0 net/unix/af_unix.c:2847
 ____sys_recvmsg+0x286/0x530
 ___sys_recvmsg+0x1ec/0x690 net/socket.c:2690
 __sys_recvmsg net/socket.c:2720 [inline]
 __do_sys_recvmsg net/socket.c:2730 [inline]
 __se_sys_recvmsg net/socket.c:2727 [inline]
 __x64_sys_recvmsg+0x1dc/0x2b0 net/socket.c:2727
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f36746a5ae9
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:00007f36741e60c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002f
RAX: ffffffffffffffda RBX: 00007f36747c5120 RCX: 00007f36746a5ae9
RDX: 0000000040010083 RSI: 0000000020000140 RDI: 0000000000000004
RBP: 00007f36746f147a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f36747c5120 R15: 00007ffd0bcc1178
 </TASK>

Allocated by task 897:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:434 [inline]
 __kasan_slab_alloc+0xb1/0xe0 mm/kasan/common.c:467
 kasan_slab_alloc include/linux/kasan.h:254 [inline]
 slab_post_alloc_hook+0x53/0x2c0 mm/slab.h:519
 slab_alloc_node mm/slub.c:3220 [inline]
 slab_alloc mm/slub.c:3228 [inline]
 kmem_cache_alloc+0xf5/0x200 mm/slub.c:3233
 kmem_cache_alloc_node include/linux/slab.h:462 [inline]
 __alloc_skb+0xbe/0x550 net/core/skbuff.c:415
 alloc_skb include/linux/skbuff.h:1167 [inline]
 alloc_skb_with_frags+0xa6/0x680 net/core/skbuff.c:6132
 sock_alloc_send_pskb+0x915/0xa50 net/core/sock.c:2512
 sock_alloc_send_skb+0x32/0x40 net/core/sock.c:2529
 queue_oob+0xfd/0x8d0 net/unix/af_unix.c:1980
 unix_stream_sendmsg+0xe0a/0x1070 net/unix/af_unix.c:2117
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 ____sys_sendmsg+0x59e/0x8f0 net/socket.c:2429
 ___sys_sendmsg+0x252/0x2e0 net/socket.c:2483
 __sys_sendmsg net/socket.c:2512 [inline]
 __do_sys_sendmsg net/socket.c:2521 [inline]
 __se_sys_sendmsg+0x19a/0x260 net/socket.c:2519
 __x64_sys_sendmsg+0x7b/0x90 net/socket.c:2519
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb

Freed by task 897:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4b/0x80 mm/kasan/common.c:46
 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:360
 ____kasan_slab_free+0x126/0x160 mm/kasan/common.c:366
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:374
 kasan_slab_free include/linux/kasan.h:230 [inline]
 slab_free_hook mm/slub.c:1705 [inline]
 slab_free_freelist_hook+0xbd/0x190 mm/slub.c:1731
 slab_free mm/slub.c:3499 [inline]
 kmem_cache_free+0x116/0x2e0 mm/slub.c:3515
 kfree_skbmem+0x104/0x170
 __kfree_skb net/core/skbuff.c:757 [inline]
 consume_skb+0xb4/0x250 net/core/skbuff.c:914
 queue_oob+0x524/0x8d0 net/unix/af_unix.c:2011
 unix_stream_sendmsg+0xe0a/0x1070 net/unix/af_unix.c:2117
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 ____sys_sendmsg+0x59e/0x8f0 net/socket.c:2429
 ___sys_sendmsg+0x252/0x2e0 net/socket.c:2483
 __sys_sendmsg net/socket.c:2512 [inline]
 __do_sys_sendmsg net/socket.c:2521 [inline]
 __se_sys_sendmsg+0x19a/0x260 net/socket.c:2519
 __x64_sys_sendmsg+0x7b/0x90 net/socket.c:2519
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb

The buggy address belongs to the object at ffff88810c2c0b40
 which belongs to the cache skbuff_head_cache of size 232
The buggy address is located 68 bytes inside of
 232-byte region [ffff88810c2c0b40, ffff88810c2c0c28)
The buggy address belongs to the page:
page:ffffea000430b000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10c2c0
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 0000000000000000 dead000000000122 ffff8881081c8a00
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 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 897, ts 51969047547, free_ts 51909721678
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x15d/0x170 mm/page_alloc.c:2420
 prep_new_page mm/page_alloc.c:2426 [inline]
 get_page_from_freelist+0x33e6/0x34c0 mm/page_alloc.c:4159
 __alloc_pages+0x38a/0x7b0 mm/page_alloc.c:5421
 allocate_slab mm/slub.c:1912 [inline]
 new_slab+0x92/0x490 mm/slub.c:1975
 ___slab_alloc+0x39e/0x830 mm/slub.c:3008
 __slab_alloc+0x4a/0x90 mm/slub.c:3095
 slab_alloc_node mm/slub.c:3186 [inline]
 slab_alloc mm/slub.c:3228 [inline]
 kmem_cache_alloc+0x134/0x200 mm/slub.c:3233
 kmem_cache_alloc_node include/linux/slab.h:462 [inline]
 __alloc_skb+0xbe/0x550 net/core/skbuff.c:415
 alloc_skb include/linux/skbuff.h:1167 [inline]
 alloc_skb_with_frags+0xa6/0x680 net/core/skbuff.c:6132
 sock_alloc_send_pskb+0x915/0xa50 net/core/sock.c:2512
 sock_alloc_send_skb+0x32/0x40 net/core/sock.c:2529
 queue_oob+0xfd/0x8d0 net/unix/af_unix.c:1980
 unix_stream_sendmsg+0xe0a/0x1070 net/unix/af_unix.c:2117
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 ____sys_sendmsg+0x59e/0x8f0 net/socket.c:2429
 ___sys_sendmsg+0x252/0x2e0 net/socket.c:2483
 __sys_sendmsg net/socket.c:2512 [inline]
 __do_sys_sendmsg net/socket.c:2521 [inline]
 __se_sys_sendmsg+0x19a/0x260 net/socket.c:2519
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1340 [inline]
 free_pcp_prepare mm/page_alloc.c:1413 [inline]
 free_unref_page_prepare+0x7a9/0x7e0 mm/page_alloc.c:3317
 free_unref_page+0x85/0x220 mm/page_alloc.c:3396
 free_the_page mm/page_alloc.c:705 [inline]
 __free_pages+0x61/0xf0 mm/page_alloc.c:5497
 __vunmap+0x7bc/0x8f0 mm/vmalloc.c:2621
 free_work+0x5b/0x80 mm/vmalloc.c:95
 process_one_work+0x6bb/0xc10 kernel/workqueue.c:2310
 worker_thread+0xad2/0x12a0 kernel/workqueue.c:2457
 kthread+0x421/0x510 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298

Memory state around the buggy address:
 ffff88810c2c0a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc
 ffff88810c2c0b00: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
>ffff88810c2c0b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff88810c2c0c00: fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc
 ffff88810c2c0c80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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