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BUG: KASAN: use-after-free in rxrpc_send_keepalive+0xe2/0x3c0 net/rxrpc/output.c:634
Read of size 8 at addr ffff8880a0282018 by task kworker/0:4/8103

CPU: 0 PID: 8103 Comm: kworker/0:4 Not tainted 5.4.0-rc3+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: krxrpcd rxrpc_peer_keepalive_worker
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1d8/0x2f8 lib/dump_stack.c:113
 print_address_description+0x75/0x5c0 mm/kasan/report.c:374
 __kasan_report+0x14b/0x1c0 mm/kasan/report.c:506
 kasan_report+0x26/0x50 mm/kasan/common.c:634
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132
 rxrpc_send_keepalive+0xe2/0x3c0 net/rxrpc/output.c:634
 rxrpc_peer_keepalive_dispatch net/rxrpc/peer_event.c:369 [inline]
 rxrpc_peer_keepalive_worker+0x76e/0xb40 net/rxrpc/peer_event.c:430
 process_one_work+0x7ef/0x10e0 kernel/workqueue.c:2269
 worker_thread+0xc01/0x1630 kernel/workqueue.c:2415
 kthread+0x332/0x350 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

Allocated by task 7748:
 save_stack mm/kasan/common.c:69 [inline]
 set_track mm/kasan/common.c:77 [inline]
 __kasan_kmalloc+0x11c/0x1b0 mm/kasan/common.c:510
 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:524
 __do_kmalloc mm/slab.c:3655 [inline]
 __kmalloc+0x254/0x340 mm/slab.c:3664
 kmalloc_array include/linux/slab.h:618 [inline]
 kcalloc+0x36/0x60 include/linux/slab.h:629
 alloc_pipe_info+0x1ce/0x3f0 fs/pipe.c:676
 get_pipe_inode fs/pipe.c:738 [inline]
 create_pipe_files+0x89/0x680 fs/pipe.c:770
 __do_pipe_flags+0x4c/0x210 fs/pipe.c:807
 do_pipe2+0x41/0x230 fs/pipe.c:855
 __do_sys_pipe2 fs/pipe.c:873 [inline]
 __se_sys_pipe2 fs/pipe.c:871 [inline]
 __x64_sys_pipe2+0x5a/0x70 fs/pipe.c:871
 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 7748:
 save_stack mm/kasan/common.c:69 [inline]
 set_track mm/kasan/common.c:77 [inline]
 kasan_set_free_info mm/kasan/common.c:332 [inline]
 __kasan_slab_free+0x12a/0x1e0 mm/kasan/common.c:471
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:480
 __cache_free mm/slab.c:3425 [inline]
 kfree+0x115/0x200 mm/slab.c:3756
 free_pipe_info+0x26c/0x2c0 fs/pipe.c:709
 put_pipe_info fs/pipe.c:582 [inline]
 pipe_release+0x23d/0x330 fs/pipe.c:603
 __fput+0x2e4/0x740 fs/file_table.c:280
 ____fput+0x15/0x20 fs/file_table.c:313
 task_work_run+0x17e/0x1b0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop arch/x86/entry/common.c:163 [inline]
 prepare_exit_to_usermode+0x459/0x580 arch/x86/entry/common.c:194
 syscall_return_slowpath+0x113/0x4a0 arch/x86/entry/common.c:274
 do_syscall_64+0x11f/0x1c0 arch/x86/entry/common.c:300
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8880a0282000
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 24 bytes inside of
 1024-byte region [ffff8880a0282000, ffff8880a0282400)
The buggy address belongs to the page:
page:ffffea000280a080 refcount:1 mapcount:0 mapping:ffff8880aa400c40 index:0xffff8880a0282800
flags: 0x1fffc0000000200(slab)
raw: 01fffc0000000200 ffffea0002925688 ffffea0002549808 ffff8880aa400c40
raw: ffff8880a0282800 ffff8880a0282000 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a0281f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880a0281f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8880a0282000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                            ^
 ffff8880a0282080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880a0282100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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