Dev loop4: unable to read RDB block 1 loop4: unable to read partition table ================================================================== BUG: KASAN: use-after-free in __list_add_valid+0x9a/0xa0 lib/list_debug.c:26 Read of size 8 at addr ffff88805b133320 by task syz-executor.5/27121 CPU: 1 PID: 27121 Comm: syz-executor.5 Not tainted 5.0.0-rc8+ #2 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+0x7c/0x20d mm/kasan/report.c:187 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:135 __list_add_valid+0x9a/0xa0 lib/list_debug.c:26 __list_add include/linux/list.h:60 [inline] list_add_tail include/linux/list.h:93 [inline] cma_listen_on_all drivers/infiniband/core/cma.c:2477 [inline] rdma_listen+0x63b/0x8e0 drivers/infiniband/core/cma.c:3492 ucma_listen+0x14d/0x1c0 drivers/infiniband/core/ucma.c:1100 ucma_write+0x2da/0x3c0 drivers/infiniband/core/ucma.c:1689 __vfs_write+0x116/0x8e0 fs/read_write.c:485 vfs_write+0x20c/0x580 fs/read_write.c:549 ksys_write+0xea/0x1f0 fs/read_write.c:598 __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:607 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457e29 Code: ad b8 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 b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f35aefb8c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457e29 RDX: 0000000000000010 RSI: 00000000200000c0 RDI: 0000000000000003 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f35aefb96d4 R13: 00000000004c70d9 R14: 00000000004dcb90 R15: 00000000ffffffff Allocated by task 25597: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_kmalloc mm/kasan/common.c:495 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:468 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:509 kmem_cache_alloc_trace+0x151/0x760 mm/slab.c:3615 kmalloc include/linux/slab.h:545 [inline] kzalloc include/linux/slab.h:740 [inline] __rdma_create_id+0x5f/0x4e0 drivers/infiniband/core/cma.c:879 ucma_create_id+0x1de/0x640 drivers/infiniband/core/ucma.c:506 ucma_write+0x2da/0x3c0 drivers/infiniband/core/ucma.c:1689 __vfs_write+0x116/0x8e0 fs/read_write.c:485 vfs_write+0x20c/0x580 fs/read_write.c:549 ksys_write+0xea/0x1f0 fs/read_write.c:598 __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:607 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 25590: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:457 kasan_slab_free+0xe/0x10 mm/kasan/common.c:465 __cache_free mm/slab.c:3494 [inline] kfree+0xcf/0x230 mm/slab.c:3811 rdma_destroy_id+0x723/0xab0 drivers/infiniband/core/cma.c:1849 ucma_close+0x115/0x320 drivers/infiniband/core/ucma.c:1770 __fput+0x2df/0x8d0 fs/file_table.c:278 ____fput+0x16/0x20 fs/file_table.c:309 task_work_run+0x14a/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x273/0x2c0 arch/x86/entry/common.c:166 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x52d/0x610 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff88805b133140 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 480 bytes inside of 2048-byte region [ffff88805b133140, ffff88805b133940) The buggy address belongs to the page: page:ffffea00016c4c80 count:1 mapcount:0 mapping:ffff88812c3f0c40 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea0002378988 ffffea0000d25188 ffff88812c3f0c40 raw: 0000000000000000 ffff88805b132040 0000000100000003 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88805b133200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805b133280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88805b133300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88805b133380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805b133400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== loop4: partition table beyond EOD, truncated loop_reread_partitions: partition scan of loop4 () failed (rc=-5) Dev loop3: unable to read RDB block 1 loop3: unable to read partition table loop3: partition table beyond EOD, truncated loop_reread_partitions: partition scan of loop3 () failed (rc=-5) __loop_clr_fd: partition scan of loop3 failed (rc=-22) __loop_clr_fd: partition scan of loop1 failed (rc=-22)