================================================================== BUG: KASAN: use-after-free in atomic_read include/asm-generic/atomic-instrumented.h:26 [inline] BUG: KASAN: use-after-free in rxrpc_queue_local+0x7c/0x3e0 net/rxrpc/local_object.c:354 Read of size 4 at addr ffff8880a82b56d4 by task syz-executor.0/11829 CPU: 1 PID: 11829 Comm: syz-executor.0 Not tainted 5.3.0-rc3+ #1 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x172/0x1f0 lib/dump_stack.c:113 print_address_description.cold+0xd4/0x306 mm/kasan/report.c:351 __kasan_report.cold+0x1b/0x36 mm/kasan/report.c:482 kasan_report+0x12/0x17 mm/kasan/common.c:612 check_memory_region_inline mm/kasan/generic.c:185 [inline] check_memory_region+0x134/0x1a0 mm/kasan/generic.c:192 __kasan_check_read+0x11/0x20 mm/kasan/common.c:92 atomic_read include/asm-generic/atomic-instrumented.h:26 [inline] rxrpc_queue_local+0x7c/0x3e0 net/rxrpc/local_object.c:354 rxrpc_unuse_local+0x52/0x80 net/rxrpc/local_object.c:408 rxrpc_release_sock net/rxrpc/af_rxrpc.c:904 [inline] rxrpc_release+0x47d/0x840 net/rxrpc/af_rxrpc.c:930 __sock_release+0xce/0x280 net/socket.c:590 sock_close+0x1e/0x30 net/socket.c:1268 __fput+0x2ff/0x890 fs/file_table.c:280 ____fput+0x16/0x20 fs/file_table.c:313 task_work_run+0x145/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x316/0x380 arch/x86/entry/common.c:163 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline] syscall_return_slowpath arch/x86/entry/common.c:274 [inline] do_syscall_64+0x5a9/0x6a0 arch/x86/entry/common.c:299 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x413511 Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 1b 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007ffc204e87c0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000413511 RDX: 0000001b2e420000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 0000000000000001 R08: ffffffffffffffff R09: ffffffffffffffff R10: 00007ffc204e88a0 R11: 0000000000000293 R12: 000000000075bf20 R13: 000000000001ac29 R14: 0000000000760210 R15: ffffffffffffffff Allocated by task 11830: save_stack+0x23/0x90 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] __kasan_kmalloc mm/kasan/common.c:487 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:460 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:501 kmem_cache_alloc_trace+0x158/0x790 mm/slab.c:3550 kmalloc include/linux/slab.h:552 [inline] kzalloc include/linux/slab.h:748 [inline] rxrpc_alloc_local net/rxrpc/local_object.c:79 [inline] rxrpc_lookup_local+0x562/0x1ba0 net/rxrpc/local_object.c:277 rxrpc_sendmsg+0x379/0x5f0 net/rxrpc/af_rxrpc.c:566 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+0xfd/0x6a0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 16: save_stack+0x23/0x90 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:449 kasan_slab_free+0xe/0x10 mm/kasan/common.c:457 __cache_free mm/slab.c:3425 [inline] kfree+0x10a/0x2c0 mm/slab.c:3756 rxrpc_local_rcu+0x62/0x80 net/rxrpc/local_object.c:495 __rcu_reclaim kernel/rcu/rcu.h:222 [inline] rcu_do_batch kernel/rcu/tree.c:2114 [inline] rcu_core+0x67f/0x1580 kernel/rcu/tree.c:2314 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2323 __do_softirq+0x262/0x98c kernel/softirq.c:292 The buggy address belongs to the object at ffff8880a82b56c0 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 20 bytes inside of 1024-byte region [ffff8880a82b56c0, ffff8880a82b5ac0) The buggy address belongs to the page: page:ffffea0002a0ad00 refcount:1 mapcount:0 mapping:ffff8880aa400c40 index:0xffff8880a82b5b40 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea0002a1cb08 ffffea00023b0c88 ffff8880aa400c40 raw: ffff8880a82b5b40 ffff8880a82b4040 0000000100000006 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a82b5580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a82b5600: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff8880a82b5680: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ^ ffff8880a82b5700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a82b5780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================