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BUG: KASAN: use-after-free in tipc_recvmsg+0xf77/0xf90 net/tipc/socket.c:1979
Read of size 4 at addr ffff8880909c96c0 by task syz-executor.1/24307

CPU: 0 PID: 24307 Comm: syz-executor.1 Not tainted 5.14.0-rc2-next-20210723-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105
 print_address_description.constprop.0.cold+0x6c/0x309 mm/kasan/report.c:256
 __kasan_report mm/kasan/report.c:442 [inline]
 kasan_report.cold+0x83/0xdf mm/kasan/report.c:459
 tipc_recvmsg+0xf77/0xf90 net/tipc/socket.c:1979
 sock_recvmsg_nosec net/socket.c:943 [inline]
 sock_recvmsg net/socket.c:961 [inline]
 sock_recvmsg net/socket.c:957 [inline]
 ____sys_recvmsg+0x2c4/0x600 net/socket.c:2611
 ___sys_recvmsg+0x127/0x200 net/socket.c:2653
 do_recvmmsg+0x24d/0x6d0 net/socket.c:2747
 __sys_recvmmsg net/socket.c:2826 [inline]
 __do_sys_recvmmsg net/socket.c:2849 [inline]
 __se_sys_recvmmsg net/socket.c:2842 [inline]
 __x64_sys_recvmmsg+0x20b/0x260 net/socket.c:2842
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665e9
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f4f30897188 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9
RDX: 0000000000000004 RSI: 0000000020004140 RDI: 0000000000000003
RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000040002000 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007ffd65182fff R14: 00007f4f30897300 R15: 0000000000022000

Allocated by task 24304:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:434 [inline]
 __kasan_slab_alloc+0x84/0xa0 mm/kasan/common.c:467
 kasan_slab_alloc include/linux/kasan.h:254 [inline]
 slab_post_alloc_hook mm/slab.h:519 [inline]
 slab_alloc_node mm/slub.c:2958 [inline]
 kmem_cache_alloc_node+0x266/0x3e0 mm/slub.c:2994
 __alloc_skb+0x20b/0x340 net/core/skbuff.c:414
 alloc_skb_fclone include/linux/skbuff.h:1162 [inline]
 tipc_buf_acquire+0x25/0xe0 net/tipc/msg.c:72
 tipc_msg_create+0x32/0x1f0 net/tipc/msg.c:104
 __tipc_shutdown+0xb7f/0xe90 net/tipc/socket.c:591
 tipc_release+0x13f/0x1a80 net/tipc/socket.c:640
 __sock_release+0xcd/0x280 net/socket.c:648
 sock_close+0x18/0x20 net/socket.c:1300
 __fput+0x288/0x920 fs/file_table.c:280
 task_work_run+0xdd/0x1a0 kernel/task_work.c:164
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:175 [inline]
 exit_to_user_mode_prepare+0x27e/0x290 kernel/entry/common.c:209
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302
 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Freed by task 24307:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46
 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:360
 ____kasan_slab_free mm/kasan/common.c:366 [inline]
 ____kasan_slab_free mm/kasan/common.c:328 [inline]
 __kasan_slab_free+0xfb/0x130 mm/kasan/common.c:374
 kasan_slab_free include/linux/kasan.h:230 [inline]
 slab_free_hook mm/slub.c:1627 [inline]
 slab_free_freelist_hook+0xdf/0x240 mm/slub.c:1652
 slab_free mm/slub.c:3212 [inline]
 kmem_cache_free+0x8e/0x5a0 mm/slub.c:3228
 kfree_skbmem+0x166/0x1b0 net/core/skbuff.c:720
 __kfree_skb net/core/skbuff.c:756 [inline]
 kfree_skb net/core/skbuff.c:773 [inline]
 kfree_skb+0x140/0x3f0 net/core/skbuff.c:767
 tipc_recvmsg+0x70d/0xf90 net/tipc/socket.c:1977
 sock_recvmsg_nosec net/socket.c:943 [inline]
 sock_recvmsg net/socket.c:961 [inline]
 sock_recvmsg net/socket.c:957 [inline]
 ____sys_recvmsg+0x2c4/0x600 net/socket.c:2611
 ___sys_recvmsg+0x127/0x200 net/socket.c:2653
 do_recvmmsg+0x24d/0x6d0 net/socket.c:2747
 __sys_recvmmsg net/socket.c:2826 [inline]
 __do_sys_recvmmsg net/socket.c:2849 [inline]
 __se_sys_recvmmsg net/socket.c:2842 [inline]
 __x64_sys_recvmmsg+0x20b/0x260 net/socket.c:2842
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

The buggy address belongs to the object at ffff8880909c9680
 which belongs to the cache skbuff_fclone_cache of size 472
The buggy address is located 64 bytes inside of
 472-byte region [ffff8880909c9680, ffff8880909c9858)
The buggy address belongs to the page:
page:ffffea0002427200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x909c8
head:ffffea0002427200 order:1 compound_mapcount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 0000000100000001 ffff888012026780
raw: 0000000000000000 00000000800c000c 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 0x52a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 22336, ts 585707613402, free_ts 486717623830
 prep_new_page mm/page_alloc.c:2424 [inline]
 get_page_from_freelist+0xa72/0x2f80 mm/page_alloc.c:4152
 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5374
 alloc_pages+0x1a3/0x2d0 mm/mempolicy.c:2278
 alloc_slab_page mm/slub.c:1690 [inline]
 allocate_slab+0x32e/0x4b0 mm/slub.c:1830
 new_slab mm/slub.c:1893 [inline]
 new_slab_objects mm/slub.c:2639 [inline]
 ___slab_alloc+0x4ba/0x820 mm/slub.c:2802
 __slab_alloc.constprop.0+0xa7/0xf0 mm/slub.c:2842
 slab_alloc_node mm/slub.c:2924 [inline]
 kmem_cache_alloc_node+0x12c/0x3e0 mm/slub.c:2994
 __alloc_skb+0x20b/0x340 net/core/skbuff.c:414
 alloc_skb_fclone include/linux/skbuff.h:1162 [inline]
 tipc_buf_acquire+0x25/0xe0 net/tipc/msg.c:72
 tipc_msg_create+0x32/0x1f0 net/tipc/msg.c:104
 __tipc_shutdown+0xb7f/0xe90 net/tipc/socket.c:591
 tipc_release+0x13f/0x1a80 net/tipc/socket.c:640
 __sock_release+0xcd/0x280 net/socket.c:648
 sock_close+0x18/0x20 net/socket.c:1300
 __fput+0x288/0x920 fs/file_table.c:280
 task_work_run+0xdd/0x1a0 kernel/task_work.c:164
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1338 [inline]
 free_pcp_prepare+0x373/0x860 mm/page_alloc.c:1389
 free_unref_page_prepare mm/page_alloc.c:3315 [inline]
 free_unref_page+0x19/0x690 mm/page_alloc.c:3394
 __vunmap+0x783/0xb70 mm/vmalloc.c:2609
 __vfree+0x3c/0xd0 mm/vmalloc.c:2657
 vfree+0x5a/0x90 mm/vmalloc.c:2688
 kvfree+0x2e/0x50 mm/util.c:639
 pcpu_mem_free mm/percpu.c:528 [inline]
 pcpu_free_chunk mm/percpu.c:1506 [inline]
 pcpu_free_chunk mm/percpu.c:1501 [inline]
 pcpu_destroy_chunk mm/percpu-vm.c:368 [inline]
 pcpu_balance_free+0x634/0xba0 mm/percpu.c:2027
 pcpu_balance_workfn+0x91f/0xe10 mm/percpu.c:2253
 process_one_work+0x98d/0x1630 kernel/workqueue.c:2276
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2422
 kthread+0x3e5/0x4d0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

Memory state around the buggy address:
 ffff8880909c9580: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc
 ffff8880909c9600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8880909c9680: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                           ^
 ffff8880909c9700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880909c9780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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