random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
==================================================================
BUG: KASAN: use-after-free in take_option security/selinux/hooks.c:2619 [inline]
BUG: KASAN: use-after-free in selinux_sb_copy_data+0x1cd/0x380 security/selinux/hooks.c:2674
Write of size 10 at addr ffff8801ca1a0000 by task syz-executor623/3790

CPU: 0 PID: 3790 Comm: syz-executor623 Not tainted 4.9.96-g8c01d00 #11
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801c28c7490 ffffffff81eb0b69 ffffea0007286800 ffff8801ca1a0000
 0000000000000001 ffff8801ca1a0000 000000000000000a ffff8801c28c74c8
 ffffffff8156540b ffff8801ca1a0000 000000000000000a 0000000000000001
Call Trace:
 [<ffffffff81eb0b69>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb0b69>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8156540b>] print_address_description+0x6c/0x234 mm/kasan/report.c:256
 [<ffffffff81565815>] kasan_report_error mm/kasan/report.c:355 [inline]
 [<ffffffff81565815>] kasan_report.cold.6+0x242/0x2fe mm/kasan/report.c:412
 [<ffffffff815382ff>] check_memory_region_inline mm/kasan/kasan.c:318 [inline]
 [<ffffffff815382ff>] check_memory_region+0x14f/0x1b0 mm/kasan/kasan.c:325
 [<ffffffff81538957>] memcpy+0x37/0x50 mm/kasan/kasan.c:361
 [<ffffffff81d0598d>] take_option security/selinux/hooks.c:2619 [inline]
 [<ffffffff81d0598d>] selinux_sb_copy_data+0x1cd/0x380 security/selinux/hooks.c:2674
 [<ffffffff81ce74fb>] security_sb_copy_data+0x7b/0xb0 security/security.c:283
 [<ffffffff81977c76>] parse_security_options+0x36/0x90 fs/btrfs/super.c:1493
 [<ffffffff81988ca3>] btrfs_mount+0x2f3/0x2bc0 fs/btrfs/super.c:1572
 [<ffffffff8157badc>] mount_fs+0x28c/0x370 fs/super.c:1206
 [<ffffffff815db081>] vfs_kern_mount.part.29+0xd1/0x3d0 fs/namespace.c:991
 [<ffffffff815db3c0>] vfs_kern_mount+0x40/0x60 fs/namespace.c:973
 [<ffffffff81988dbb>] mount_subvol fs/btrfs/super.c:1395 [inline]
 [<ffffffff81988dbb>] btrfs_mount+0x40b/0x2bc0 fs/btrfs/super.c:1566
 [<ffffffff8157badc>] mount_fs+0x28c/0x370 fs/super.c:1206
 [<ffffffff815db081>] vfs_kern_mount.part.29+0xd1/0x3d0 fs/namespace.c:991
 [<ffffffff815e29a9>] vfs_kern_mount fs/namespace.c:973 [inline]
 [<ffffffff815e29a9>] do_new_mount fs/namespace.c:2513 [inline]
 [<ffffffff815e29a9>] do_mount+0x3c9/0x2740 fs/namespace.c:2835
 [<ffffffff81689a6c>] C_SYSC_mount fs/compat.c:810 [inline]
 [<ffffffff81689a6c>] compat_SyS_mount+0x4fc/0xff0 fs/compat.c:775
 [<ffffffff81006da7>] do_syscall_32_irqs_on arch/x86/entry/common.c:325 [inline]
 [<ffffffff81006da7>] do_fast_syscall_32+0x2f7/0x870 arch/x86/entry/common.c:387
 [<ffffffff839f4a10>] entry_SYSENTER_compat+0x90/0xa2 arch/x86/entry/entry_64_compat.S:137

Allocated by task 3742:
 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
 kmem_cache_alloc_trace+0xfd/0x2b0 mm/slub.c:2742
 kmalloc include/linux/slab.h:490 [inline]
 sock_alloc_inode+0x66/0x260 net/socket.c:253
 alloc_inode+0x63/0x180 fs/inode.c:207
 new_inode_pseudo+0x17/0xe0 fs/inode.c:890
 sock_alloc+0x41/0x280 net/socket.c:567
 SYSC_accept4+0xff/0x680 net/socket.c:1463
 SyS_accept4 net/socket.c:1444 [inline]
 SYSC_accept net/socket.c:1528 [inline]
 SyS_accept+0x26/0x30 net/socket.c:1525
 do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 entry_SYSCALL_64_after_swapgs+0x5d/0xdb

Freed by task 17:
 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
 __rcu_reclaim kernel/rcu/rcu.h:113 [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+0x9d5/0x12b0 kernel/rcu/tree.c:3037
 __do_softirq+0x20b/0x937 kernel/softirq.c:284

The buggy address belongs to the object at ffff8801ca1a0000
 which belongs to the cache kmalloc-128 of size 128
The buggy address is located 0 bytes inside of
 128-byte region [ffff8801ca1a0000, ffff8801ca1a0080)
The buggy address belongs to the page:
page:ffffea0007286800 count:1 mapcount:0 mapping:          (null) index:0x0
flags: 0x8000000000000080(slab)
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801ca19ff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801ca19ff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8801ca1a0000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff8801ca1a0080: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
 ffff8801ca1a0100: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
==================================================================