netlink: 'syz-executor0': attribute type 4 has an invalid length. binder: BINDER_SET_CONTEXT_MGR already set ================================================================== BUG: KASAN: use-after-free in ucma_close+0x2d7/0x2f0 drivers/infiniband/core/ucma.c:1693 binder: 18117:18130 ioctl 40046207 0 returned -16 Read of size 8 at addr ffff8801b11f3300 by task syz-executor5/18133 CPU: 1 PID: 18133 Comm: syz-executor5 Not tainted 4.16.0-rc5+ #268 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+0x194/0x24d lib/dump_stack.c:53 netlink: 'syz-executor0': attribute type 4 has an invalid length. print_address_description+0x73/0x250 mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report+0x23c/0x360 mm/kasan/report.c:412 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 ucma_close+0x2d7/0x2f0 drivers/infiniband/core/ucma.c:1693 __fput+0x327/0x7e0 fs/file_table.c:209 ____fput+0x15/0x20 fs/file_table.c:243 task_work_run+0x199/0x270 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x9bb/0x1ad0 kernel/exit.c:865 do_group_exit+0x149/0x400 kernel/exit.c:968 get_signal+0x73a/0x16d0 kernel/signal.c:2469 do_signal+0x90/0x1e90 arch/x86/kernel/signal.c:809 exit_to_usermode_loop+0x258/0x2f0 arch/x86/entry/common.c:162 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline] syscall_return_slowpath arch/x86/entry/common.c:265 [inline] do_syscall_32_irqs_on arch/x86/entry/common.c:336 [inline] do_fast_syscall_32+0xbe6/0xf9f arch/x86/entry/common.c:392 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 RIP: 0023:0xf7f04c99 RSP: 002b:00000000f76df10c EFLAGS: 00000296 ORIG_RAX: 00000000000000f0 RAX: fffffffffffffe00 RBX: 000000000813af98 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 18121: save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:552 kmem_cache_alloc_trace+0x136/0x740 mm/slab.c:3607 kmalloc include/linux/slab.h:512 [inline] kzalloc include/linux/slab.h:701 [inline] ucma_alloc_ctx+0xce/0x610 drivers/infiniband/core/ucma.c:188 ucma_create_id+0x205/0x620 drivers/infiniband/core/ucma.c:473 ucma_write+0x2d6/0x3d0 drivers/infiniband/core/ucma.c:1633 __vfs_write+0xef/0x970 fs/read_write.c:480 vfs_write+0x189/0x510 fs/read_write.c:544 SYSC_write fs/read_write.c:589 [inline] SyS_write+0xef/0x220 fs/read_write.c:581 do_syscall_32_irqs_on arch/x86/entry/common.c:330 [inline] do_fast_syscall_32+0x3ec/0xf9f arch/x86/entry/common.c:392 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 Freed by task 18121: save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:520 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:527 __cache_free mm/slab.c:3485 [inline] kfree+0xd9/0x260 mm/slab.c:3800 ucma_create_id+0x45b/0x620 drivers/infiniband/core/ucma.c:500 ucma_write+0x2d6/0x3d0 drivers/infiniband/core/ucma.c:1633 __vfs_write+0xef/0x970 fs/read_write.c:480 vfs_write+0x189/0x510 fs/read_write.c:544 SYSC_write fs/read_write.c:589 [inline] SyS_write+0xef/0x220 fs/read_write.c:581 do_syscall_32_irqs_on arch/x86/entry/common.c:330 [inline] do_fast_syscall_32+0x3ec/0xf9f arch/x86/entry/common.c:392 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 The buggy address belongs to the object at ffff8801b11f3280 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 128 bytes inside of 256-byte region [ffff8801b11f3280, ffff8801b11f3380) The buggy address belongs to the page: page:ffffea0006c47cc0 count:1 mapcount:0 mapping:ffff8801b11f3000 index:0x0 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffff8801b11f3000 0000000000000000 000000010000000c raw: ffffea0006c48fe0 ffffea0006a90c60 ffff8801dac007c0 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801b11f3200: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc ffff8801b11f3280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8801b11f3300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8801b11f3380: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ffff8801b11f3400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================