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BUG: KASAN: use-after-free in __list_add_valid+0x58/0xc0 lib/list_debug.c:26
Read of size 8 at addr ffff88809587c1e0 by task syz-executor.2/23815

CPU: 1 PID: 23815 Comm: syz-executor.2 Not tainted 5.5.0-syzkaller #0
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+0x1fb/0x318 lib/dump_stack.c:118
 print_address_description+0x74/0x5c0 mm/kasan/report.c:374
 __kasan_report+0x149/0x1c0 mm/kasan/report.c:506
 kasan_report+0x26/0x50 mm/kasan/common.c:641
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:135
 __list_add_valid+0x58/0xc0 lib/list_debug.c:26
 __list_add include/linux/list.h:67 [inline]
 list_add_tail include/linux/list.h:100 [inline]
 cma_listen_on_all drivers/infiniband/core/cma.c:2512 [inline]
 rdma_listen+0x322/0x9a0 drivers/infiniband/core/cma.c:3622
 ucma_listen+0x245/0x300 drivers/infiniband/core/ucma.c:1092
 ucma_write+0x2da/0x360 drivers/infiniband/core/ucma.c:1684
 __vfs_write+0xb8/0x740 fs/read_write.c:494
 vfs_write+0x270/0x580 fs/read_write.c:558
 ksys_write+0x117/0x220 fs/read_write.c:611
 __do_sys_write fs/read_write.c:623 [inline]
 __se_sys_write fs/read_write.c:620 [inline]
 __x64_sys_write+0x7b/0x90 fs/read_write.c:620
 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45b399
Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f2adc643c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f2adc6446d4 RCX: 000000000045b399
RDX: 0000000000000010 RSI: 00000000200001c0 RDI: 0000000000000006
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000c8a R14: 00000000004cd68f R15: 000000000075bf2c

Allocated by task 23796:
 save_stack mm/kasan/common.c:72 [inline]
 set_track mm/kasan/common.c:80 [inline]
 __kasan_kmalloc+0x118/0x1c0 mm/kasan/common.c:515
 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:529
 kmem_cache_alloc_trace+0x221/0x2f0 mm/slab.c:3551
 kmalloc include/linux/slab.h:556 [inline]
 kzalloc include/linux/slab.h:670 [inline]
 __rdma_create_id+0x66/0x4f0 drivers/infiniband/core/cma.c:856
 ucma_create_id+0x253/0x540 drivers/infiniband/core/ucma.c:501
 ucma_write+0x2da/0x360 drivers/infiniband/core/ucma.c:1684
 __vfs_write+0xb8/0x740 fs/read_write.c:494
 vfs_write+0x270/0x580 fs/read_write.c:558
 ksys_write+0x117/0x220 fs/read_write.c:611
 __do_sys_write fs/read_write.c:623 [inline]
 __se_sys_write fs/read_write.c:620 [inline]
 __x64_sys_write+0x7b/0x90 fs/read_write.c:620
 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 23794:
 save_stack mm/kasan/common.c:72 [inline]
 set_track mm/kasan/common.c:80 [inline]
 kasan_set_free_info mm/kasan/common.c:337 [inline]
 __kasan_slab_free+0x12e/0x1e0 mm/kasan/common.c:476
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:485
 __cache_free mm/slab.c:3426 [inline]
 kfree+0x10d/0x220 mm/slab.c:3757
 rdma_destroy_id+0xf72/0x1160 drivers/infiniband/core/cma.c:1861
 ucma_close+0x1eb/0x2d0 drivers/infiniband/core/ucma.c:1762
 __fput+0x2e4/0x740 fs/file_table.c:280
 ____fput+0x15/0x20 fs/file_table.c:313
 task_work_run+0x176/0x1b0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop arch/x86/entry/common.c:164 [inline]
 prepare_exit_to_usermode+0x480/0x5b0 arch/x86/entry/common.c:195
 syscall_return_slowpath+0x113/0x4a0 arch/x86/entry/common.c:278
 do_syscall_64+0x11f/0x1c0 arch/x86/entry/common.c:304
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff88809587c000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 480 bytes inside of
 2048-byte region [ffff88809587c000, ffff88809587c800)
The buggy address belongs to the page:
page:ffffea0002561f00 refcount:1 mapcount:0 mapping:ffff8880aa400e00 index:0x0
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea00029a2bc8 ffffea0002550048 ffff8880aa400e00
raw: 0000000000000000 ffff88809587c000 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88809587c080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88809587c100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88809587c180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                       ^
 ffff88809587c200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88809587c280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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