IPVS: sync thread started: state = MASTER, mcast_ifn = veth1_to_bridge, syncid = 0, id = 6 IPVS: sync thread started: state = MASTER, mcast_ifn = veth1_to_bridge, syncid = 0, id = 7 netlink: 28 bytes leftover after parsing attributes in process `syz-executor2'. netlink: 28 bytes leftover after parsing attributes in process `syz-executor2'. ================================================================== BUG: KASAN: slab-out-of-bounds in strlen+0x91/0xa0 lib/string.c:481 Read of size 1 at addr ffff8801d8795ad0 by task syz-executor4/13976 CPU: 1 PID: 13976 Comm: syz-executor4 Not tainted 4.9.97-g2bcbbd5 #11 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ffff8801d5397978 ffffffff81eb0b69 ffffea000761e540 ffff8801d8795ad0 0000000000000000 ffff8801d8795ad0 ffff8801d8795ac8 ffff8801d53979b0 ffffffff8156540b ffff8801d8795ad0 0000000000000001 0000000000000000 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] print_address_description+0x6c/0x234 mm/kasan/report.c:256 [] kasan_report_error mm/kasan/report.c:355 [inline] [] kasan_report.cold.6+0x242/0x2fe mm/kasan/report.c:412 [] __asan_report_load1_noabort+0x14/0x20 mm/kasan/report.c:430 [] strlen+0x91/0xa0 lib/string.c:481 [] getname_kernel+0x24/0x340 fs/namei.c:215 [] kern_path_mountpoint+0x24/0x70 fs/namei.c:2754 [] find_autofs_mount.isra.4+0x8e/0x200 fs/autofs4/dev-ioctl.c:213 [] autofs_dev_ioctl_open_mountpoint fs/autofs4/dev-ioctl.c:258 [inline] [] autofs_dev_ioctl_openmount+0x153/0x2d0 fs/autofs4/dev-ioctl.c:303 [] _autofs_dev_ioctl+0x4fb/0x690 fs/autofs4/dev-ioctl.c:699 [] autofs_dev_ioctl+0x1b/0x30 fs/autofs4/dev-ioctl.c:714 [] vfs_ioctl fs/ioctl.c:43 [inline] [] file_ioctl fs/ioctl.c:493 [inline] [] do_vfs_ioctl+0x1ac/0x11a0 fs/ioctl.c:677 [] SYSC_ioctl fs/ioctl.c:694 [inline] [] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:685 [] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282 [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb Allocated by task 13976: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57 save_stack+0x43/0xd0 mm/kasan/kasan.c:505 set_track mm/kasan/kasan.c:517 [inline] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:609 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:547 slab_post_alloc_hook mm/slab.h:417 [inline] slab_alloc_node mm/slub.c:2715 [inline] slab_alloc mm/slub.c:2723 [inline] __kmalloc_track_caller+0xdc/0x2b0 mm/slub.c:4232 memdup_user+0x2c/0xb0 mm/util.c:161 copy_dev_ioctl fs/autofs4/dev-ioctl.c:110 [inline] _autofs_dev_ioctl+0x13a/0x690 fs/autofs4/dev-ioctl.c:645 autofs_dev_ioctl+0x1b/0x30 fs/autofs4/dev-ioctl.c:714 vfs_ioctl fs/ioctl.c:43 [inline] file_ioctl fs/ioctl.c:493 [inline] do_vfs_ioctl+0x1ac/0x11a0 fs/ioctl.c:677 SYSC_ioctl fs/ioctl.c:694 [inline] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:685 do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282 entry_SYSCALL_64_after_swapgs+0x5d/0xdb Freed by task 11931: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57 save_stack+0x43/0xd0 mm/kasan/kasan.c:505 set_track mm/kasan/kasan.c:517 [inline] kasan_slab_free+0x72/0xc0 mm/kasan/kasan.c:582 slab_free_hook mm/slub.c:1355 [inline] slab_free_freelist_hook mm/slub.c:1377 [inline] slab_free mm/slub.c:2958 [inline] kfree+0xfb/0x310 mm/slub.c:3878 selinux_cred_free+0x48/0x70 security/selinux/hooks.c:3732 security_cred_free+0x4e/0x90 security/security.c:909 put_cred_rcu+0x62/0x270 kernel/cred.c:116 __rcu_reclaim kernel/rcu/rcu.h:118 [inline] rcu_do_batch kernel/rcu/tree.c:2789 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:3053 [inline] __rcu_process_callbacks kernel/rcu/tree.c:3020 [inline] rcu_process_callbacks+0x8ae/0x12b0 kernel/rcu/tree.c:3037 __do_softirq+0x20b/0x937 kernel/softirq.c:284 The buggy address belongs to the object at ffff8801d8795ab0 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 0 bytes to the right of 32-byte region [ffff8801d8795ab0, ffff8801d8795ad0) The buggy address belongs to the page: page:ffffea000761e540 count:1 mapcount:0 mapping: (null) index:0x0 flags: 0x8000000000000080(slab) page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801d8795980: fc fc fb fb fb fb fc fc fb fb fb fb fc fc fb fb ffff8801d8795a00: fb fb fc fc fb fb fb fb fc fc fb fb fb fb fc fc >ffff8801d8795a80: fb fb fb fb fc fc 00 00 00 00 fc fc fb fb fb fb ^ ffff8801d8795b00: fc fc fb fb fb fb fc fc fb fb fb fb fc fc fb fb ffff8801d8795b80: fb fb fc fc fb fb fb fb fc fc fb fb fb fb fc fc ==================================================================