IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready 8021q: adding VLAN 0 to HW filter on device batadv0 audit: type=1400 audit(1550506903.495:38): avc: denied { associate } for pid=8252 comm="syz-executor.0" name="syz0" scontext=unconfined_u:object_r:unlabeled_t:s0 tcontext=system_u:object_r:unlabeled_t:s0 tclass=filesystem permissive=1 ===================================== WARNING: bad unlock balance detected! 5.0.0-rc6+ #76 Not tainted ------------------------------------- syz-executor.0/8871 is trying to release lock (&file->mut) at: [] ucma_destroy_id+0x24c/0x4a0 drivers/infiniband/core/ucma.c:628 but there are no more locks to release! other info that might help us debug this: 1 lock held by syz-executor.0/8871: #0: 00000000808e5c33 (&file->mut){+.+.}, at: ucma_destroy_id+0x1e9/0x4a0 drivers/infiniband/core/ucma.c:626 stack backtrace: CPU: 1 PID: 8871 Comm: syz-executor.0 Not tainted 5.0.0-rc6+ #76 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_unlock_imbalance_bug kernel/locking/lockdep.c:3391 [inline] print_unlock_imbalance_bug.cold+0x114/0x123 kernel/locking/lockdep.c:3368 __lock_release kernel/locking/lockdep.c:3601 [inline] lock_release+0x67e/0xa00 kernel/locking/lockdep.c:3860 __mutex_unlock_slowpath+0x8e/0x6b0 kernel/locking/mutex.c:1197 mutex_unlock+0xd/0x10 kernel/locking/mutex.c:713 ucma_destroy_id+0x24c/0x4a0 drivers/infiniband/core/ucma.c:628 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:00007fa7ac1e7c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457e29 RDX: 0000000000000018 RSI: 0000000020000180 RDI: 0000000000000005 RBP: 000000000073bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fa7ac1e86d4 R13: 00000000004cd790 R14: 00000000004dc9d0 R15: 00000000ffffffff ================================================================== BUG: KASAN: use-after-free in ucma_destroy_id+0x44c/0x4a0 drivers/infiniband/core/ucma.c:630 Read of size 8 at addr ffff888093cda928 by task syz-executor.0/8871 CPU: 1 PID: 8871 Comm: syz-executor.0 Not tainted 5.0.0-rc6+ #76 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 ucma_destroy_id+0x44c/0x4a0 drivers/infiniband/core/ucma.c:630 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:00007fa7ac1e7c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457e29 RDX: 0000000000000018 RSI: 0000000020000180 RDI: 0000000000000005 RBP: 000000000073bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fa7ac1e86d4 R13: 00000000004cd790 R14: 00000000004dc9d0 R15: 00000000ffffffff Allocated by task 8867: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_kmalloc mm/kasan/common.c:496 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:469 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:504 kmem_cache_alloc_trace+0x151/0x760 mm/slab.c:3609 kmalloc include/linux/slab.h:545 [inline] kzalloc include/linux/slab.h:740 [inline] ucma_alloc_ctx+0x4e/0x4e0 drivers/infiniband/core/ucma.c:209 ucma_create_id+0x12d/0x640 drivers/infiniband/core/ucma.c:500 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 8866: 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:458 kasan_slab_free+0xe/0x10 mm/kasan/common.c:466 __cache_free mm/slab.c:3487 [inline] kfree+0xcf/0x230 mm/slab.c:3806 ucma_free_ctx+0x801/0xb90 drivers/infiniband/core/ucma.c:599 ucma_close+0x122/0x320 drivers/infiniband/core/ucma.c:1775 __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 ffff888093cda8c0 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 104 bytes inside of 256-byte region [ffff888093cda8c0, ffff888093cda9c0) The buggy address belongs to the page: page:ffffea00024f3680 count:1 mapcount:0 mapping:ffff88812c3f07c0 index:0x0 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea0002062a08 ffff88812c3f1648 ffff88812c3f07c0 raw: 0000000000000000 ffff888093cda000 000000010000000c 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888093cda800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888093cda880: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb >ffff888093cda900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888093cda980: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888093cdaa00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================