================================================================== BUG: KASAN: use-after-free in __list_del_entry_valid+0xe0/0xf0 lib/list_debug.c:51 Read of size 8 at addr ffff8880a916ef98 by task syz-executor.2/31112 CPU: 0 PID: 31112 Comm: syz-executor.2 Not tainted 4.14.232-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+0x1b2/0x281 lib/dump_stack.c:58 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252 kasan_report_error.cold+0x8a/0x191 mm/kasan/report.c:351 kasan_report mm/kasan/report.c:409 [inline] __asan_report_load8_noabort+0x68/0x70 mm/kasan/report.c:430 __list_del_entry_valid+0xe0/0xf0 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:1607 [inline] cma_cancel_operation drivers/infiniband/core/cma.c:1635 [inline] cma_cancel_operation+0x285/0x950 drivers/infiniband/core/cma.c:1623 rdma_destroy_id+0x84/0xb60 drivers/infiniband/core/cma.c:1699 ucma_close+0x11a/0x340 drivers/infiniband/core/ucma.c:1753 __fput+0x25f/0x7a0 fs/file_table.c:210 task_work_run+0x11f/0x190 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1ad/0x200 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+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x4193eb RSP: 002b:00007fff63419af0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000005 RCX: 00000000004193eb RDX: 0000000000571290 RSI: 00000000089075c3 RDI: 0000000000000004 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000001b2d7220c4 R10: 00007fff63419be0 R11: 0000000000000293 R12: 00000000000b529b R13: 00000000000003e8 R14: 000000000056bf60 R15: 00000000000b5272 Allocated by task 31113: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551 kmem_cache_alloc_trace+0x131/0x3d0 mm/slab.c:3618 kmalloc include/linux/slab.h:488 [inline] kzalloc include/linux/slab.h:661 [inline] rdma_create_id+0x57/0x4c0 drivers/infiniband/core/cma.c:790 ucma_create_id+0x18b/0x500 drivers/infiniband/core/ucma.c:484 ucma_write+0x206/0x2c0 drivers/infiniband/core/ucma.c:1672 __vfs_write+0xe4/0x630 fs/read_write.c:480 vfs_write+0x17f/0x4d0 fs/read_write.c:544 SYSC_write fs/read_write.c:590 [inline] SyS_write+0xf2/0x210 fs/read_write.c:582 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb Freed by task 31112: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0xc3/0x1a0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kfree+0xc9/0x250 mm/slab.c:3815 ucma_close+0x11a/0x340 drivers/infiniband/core/ucma.c:1753 __fput+0x25f/0x7a0 fs/file_table.c:210 task_work_run+0x11f/0x190 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1ad/0x200 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+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb The buggy address belongs to the object at ffff8880a916edc0 which belongs to the cache kmalloc-1024 of size 1024 The buggy address is located 472 bytes inside of 1024-byte region [ffff8880a916edc0, ffff8880a916f1c0) The buggy address belongs to the page: page:ffffea0002a45b80 count:1 mapcount:0 mapping:ffff8880a916e040 index:0x0 compound_mapcount: 0 flags: 0xfff00000008100(slab|head) raw: 00fff00000008100 ffff8880a916e040 0000000000000000 0000000100000007 raw: ffffea0002cab7a0 ffffea0002af9320 ffff88813fe80ac0 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a916ee80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a916ef00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880a916ef80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880a916f000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a916f080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== audit: type=1804 audit(1621010866.470:1216): pid=31121 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.5" name="bus" dev="sda1" ino=14489 res=1 overlayfs: failed to resolve 'file0ÿÿ': -2 audit: type=1804 audit(1621010866.530:1217): pid=31125 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.5" name="bus" dev="sda1" ino=14489 res=1 overlayfs: unrecognized mount option "metacopy=off" or missing value overlayfs: unrecognized mount option "low" or missing value tmpfs: No value for mount option '00000000000000060928' audit: type=1804 audit(1621010867.060:1218): pid=31137 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.3" name="/root/syzkaller-testdir353800971/syzkaller.K2Yn0k/144/bus" dev="sda1" ino=14504 res=1 audit: type=1804 audit(1621010867.110:1219): pid=31133 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.3" name="/root/syzkaller-testdir353800971/syzkaller.K2Yn0k/144/bus" dev="sda1" ino=14504 res=1