================================================================== BUG: KASAN: use-after-free in __list_del_entry_valid+0xe6/0xf5 lib/list_debug.c:51 Read of size 8 at addr ffff8880976fdcd8 by task syz-executor.1/4942 CPU: 0 PID: 4942 Comm: syz-executor.1 Not tainted 4.14.161-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x142/0x197 lib/dump_stack.c:58 net_ratelimit: 10 callbacks suppressed protocol 88fb is buggy, dev hsr_slave_0 print_address_description.cold+0x7c/0x1dc mm/kasan/report.c:252 protocol 88fb is buggy, dev hsr_slave_1 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report mm/kasan/report.c:409 [inline] kasan_report.cold+0xa9/0x2af mm/kasan/report.c:393 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:430 __list_del_entry_valid+0xe6/0xf5 lib/list_debug.c:51 __list_del_entry include/linux/list.h:117 [inline] list_del include/linux/list.h:125 [inline] cma_cancel_listens drivers/infiniband/core/cma.c:1603 [inline] cma_cancel_operation drivers/infiniband/core/cma.c:1631 [inline] cma_cancel_operation+0x28c/0x960 drivers/infiniband/core/cma.c:1619 rdma_destroy_id+0x95/0xb70 drivers/infiniband/core/cma.c:1695 ucma_close+0x110/0x310 drivers/infiniband/core/ucma.c:1753 __fput+0x275/0x7a0 fs/file_table.c:210 ____fput+0x16/0x20 fs/file_table.c:244 task_work_run+0x114/0x190 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1da/0x220 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4bc/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x414581 RSP: 002b:00007ffff3101a20 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000008 RCX: 0000000000414581 RDX: 0000000000000000 RSI: ffffffff865eda12 RDI: 0000000000000007 RBP: 0000000000000001 R08: ffffffff813ef83f R09: 00007f9f2f40be18 R10: ffffffff8192c438 R11: 0000000000000293 R12: 000000000075c9a0 R13: 000000000075c9a0 R14: 0000000000763c80 R15: 000000000075c07c Allocated by task 4945: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x45/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc mm/kasan/kasan.c:551 [inline] kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:529 kmem_cache_alloc_trace+0x152/0x790 mm/slab.c:3618 kmalloc include/linux/slab.h:488 [inline] kzalloc include/linux/slab.h:661 [inline] rdma_create_id+0x5a/0x4d0 drivers/infiniband/core/cma.c:790 ucma_create_id+0x19b/0x5b0 drivers/infiniband/core/ucma.c:484 ucma_write+0x231/0x310 drivers/infiniband/core/ucma.c:1672 __vfs_write+0x105/0x6b0 fs/read_write.c:480 vfs_write+0x198/0x500 fs/read_write.c:544 SYSC_write fs/read_write.c:590 [inline] SyS_write+0xfd/0x230 fs/read_write.c:582 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 Freed by task 4940: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x45/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0x75/0xc0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kfree+0xcc/0x270 mm/slab.c:3815 rdma_destroy_id+0x6fa/0xb70 drivers/infiniband/core/cma.c:1725 ucma_close+0x110/0x310 drivers/infiniband/core/ucma.c:1753 __fput+0x275/0x7a0 fs/file_table.c:210 ____fput+0x16/0x20 fs/file_table.c:244 task_work_run+0x114/0x190 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1da/0x220 arch/x86/entry/common.c:164 protocol 88fb is buggy, dev hsr_slave_0 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4bc/0x640 arch/x86/entry/common.c:297 protocol 88fb is buggy, dev hsr_slave_1 entry_SYSCALL_64_after_hwframe+0x42/0xb7 The buggy address belongs to the object at ffff8880976fdb00 which belongs to the cache kmalloc-1024 of size 1024 The buggy address is located 472 bytes inside of 1024-byte region [ffff8880976fdb00, ffff8880976fdf00) The buggy address belongs to the page: page:ffffea00025dbf00 count:1 mapcount:0 mapping:ffff8880976fc000 index:0xffff8880976fc900 compound_mapcount: 0 flags: 0xfffe0000008100(slab|head) raw: 00fffe0000008100 ffff8880976fc000 ffff8880976fc900 0000000100000006 raw: ffffea0001673020 ffffea0001ac15a0 ffff8880aa800ac0 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880976fdb80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880976fdc00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880976fdc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880976fdd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880976fdd80: fb fb fb fb fb fb fb fb fb 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