================================================================== BUG: KASAN: use-after-free in rxrpc_send_keepalive+0x8a2/0x940 net/rxrpc/output.c:634 Read of size 8 at addr ffff88805affd818 by task kworker/0:0/29196 CPU: 0 PID: 29196 Comm: kworker/0:0 Not tainted 5.4.0-rc2+ #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+0x172/0x1f0 lib/dump_stack.c:113 print_address_description.constprop.0.cold+0xd4/0x30b mm/kasan/report.c:374 __kasan_report.cold+0x1b/0x41 mm/kasan/report.c:506 kasan_report+0x12/0x20 mm/kasan/common.c:634 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132 rxrpc_send_keepalive+0x8a2/0x940 net/rxrpc/output.c:634 rxrpc_peer_keepalive_dispatch net/rxrpc/peer_event.c:369 [inline] rxrpc_peer_keepalive_worker+0x7be/0xd02 net/rxrpc/peer_event.c:430 process_one_work+0x9af/0x1740 kernel/workqueue.c:2269 worker_thread+0x98/0xe40 kernel/workqueue.c:2415 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Allocated by task 19043: save_stack+0x23/0x90 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] __kasan_kmalloc mm/kasan/common.c:510 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:483 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:524 kmem_cache_alloc_trace+0x158/0x790 mm/slab.c:3550 kmalloc include/linux/slab.h:556 [inline] kzalloc include/linux/slab.h:690 [inline] rxrpc_alloc_peer+0x8c/0x300 net/rxrpc/peer_object.c:216 rxrpc_create_peer net/rxrpc/peer_object.c:288 [inline] rxrpc_lookup_peer+0x263/0x5b0 net/rxrpc/peer_object.c:343 rxrpc_get_client_conn net/rxrpc/conn_client.c:288 [inline] rxrpc_connect_call+0x1af/0x4c00 net/rxrpc/conn_client.c:697 rxrpc_new_client_call+0x978/0x19d0 net/rxrpc/call_object.c:289 rxrpc_new_client_call_for_sendmsg net/rxrpc/sendmsg.c:595 [inline] rxrpc_do_sendmsg+0xff5/0x1d53 net/rxrpc/sendmsg.c:652 rxrpc_sendmsg+0x4d6/0x5f0 net/rxrpc/af_rxrpc.c:585 sock_sendmsg_nosec net/socket.c:637 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:657 ___sys_sendmsg+0x3e2/0x920 net/socket.c:2311 __sys_sendmmsg+0x1bf/0x4d0 net/socket.c:2413 __do_sys_sendmmsg net/socket.c:2442 [inline] __se_sys_sendmmsg net/socket.c:2439 [inline] __x64_sys_sendmmsg+0x9d/0x100 net/socket.c:2439 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 9193: save_stack+0x23/0x90 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] kasan_set_free_info mm/kasan/common.c:332 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:471 kasan_slab_free+0xe/0x10 mm/kasan/common.c:480 __cache_free mm/slab.c:3425 [inline] kfree+0x10a/0x2c0 mm/slab.c:3756 __rcu_reclaim kernel/rcu/rcu.h:215 [inline] rcu_do_batch kernel/rcu/tree.c:2157 [inline] rcu_core+0x64b/0x1560 kernel/rcu/tree.c:2377 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2386 __do_softirq+0x262/0x98c kernel/softirq.c:292 The buggy address belongs to the object at ffff88805affd800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 24 bytes inside of 1024-byte region [ffff88805affd800, ffff88805affdc00) The buggy address belongs to the page: page:ffffea00016bff40 refcount:1 mapcount:0 mapping:ffff8880aa400c40 index:0x0 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea0001891d48 ffffea0000f3d008 ffff8880aa400c40 raw: 0000000000000000 ffff88805affd000 0000000100000002 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88805affd700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88805affd780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88805affd800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88805affd880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805affd900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================