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: double-free or invalid-free in p9stat_free+0x35/0x100 net/9p/protocol.c:48 CPU: 0 PID: 4499 Comm: syz-executor922 Not tainted 4.18.0-next-20180824+ #47 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+0x1c9/0x2b4 lib/dump_stack.c:113 print_address_description+0x6c/0x20b mm/kasan/report.c:256 kasan_report_invalid_free+0x64/0xa0 mm/kasan/report.c:336 __kasan_slab_free+0x150/0x170 mm/kasan/kasan.c:501 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xd9/0x210 mm/slab.c:3813 p9stat_free+0x35/0x100 net/9p/protocol.c:48 v9fs_dir_readdir+0x68e/0xbc0 fs/9p/vfs_dir.c:153 iterate_dir+0x48b/0x5d0 fs/readdir.c:51 __do_sys_getdents fs/readdir.c:231 [inline] __se_sys_getdents fs/readdir.c:212 [inline] __x64_sys_getdents+0x29f/0x510 fs/readdir.c:212 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4406a9 Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 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 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fffc1b13808 EFLAGS: 00000217 ORIG_RAX: 000000000000004e RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00000000004406a9 RDX: 0000000000000008 RSI: 0000000020000180 RDI: 0000000000000005 RBP: 64663d736e617274 R08: 0000000000401f30 R09: 0000000000401f30 R10: 0000000000401f30 R11: 0000000000000217 R12: 0000000000401f30 R13: 0000000000401fc0 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 4499: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 __do_kmalloc mm/slab.c:3718 [inline] __kmalloc+0x14e/0x720 mm/slab.c:3727 kmalloc include/linux/slab.h:518 [inline] p9pdu_vreadf net/9p/protocol.c:157 [inline] p9pdu_readf+0x526/0x2170 net/9p/protocol.c:536 p9pdu_vreadf net/9p/protocol.c:208 [inline] p9pdu_readf+0xd5c/0x2170 net/9p/protocol.c:536 p9stat_read+0x194/0x5d0 net/9p/protocol.c:565 v9fs_dir_readdir+0x63d/0xbc0 fs/9p/vfs_dir.c:149 iterate_dir+0x48b/0x5d0 fs/readdir.c:51 __do_sys_getdents fs/readdir.c:231 [inline] __se_sys_getdents fs/readdir.c:212 [inline] __x64_sys_getdents+0x29f/0x510 fs/readdir.c:212 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 4499: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xd9/0x210 mm/slab.c:3813 p9stat_free+0x35/0x100 net/9p/protocol.c:48 p9pdu_vreadf net/9p/protocol.c:220 [inline] p9pdu_readf+0xd90/0x2170 net/9p/protocol.c:536 p9stat_read+0x194/0x5d0 net/9p/protocol.c:565 v9fs_dir_readdir+0x63d/0xbc0 fs/9p/vfs_dir.c:149 iterate_dir+0x48b/0x5d0 fs/readdir.c:51 __do_sys_getdents fs/readdir.c:231 [inline] __se_sys_getdents fs/readdir.c:212 [inline] __x64_sys_getdents+0x29f/0x510 fs/readdir.c:212 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8801b3006700 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 0 bytes inside of 32-byte region [ffff8801b3006700, ffff8801b3006720) The buggy address belongs to the page: page:ffffea0006cc0180 count:1 mapcount:0 mapping:ffff8801dac001c0 index:0xffff8801b3006fc1 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffff8801dac01238 ffffea0006cc6548 ffff8801dac001c0 raw: ffff8801b3006fc1 ffff8801b3006000 0000000100000037 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801b3006600: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ffff8801b3006680: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc >ffff8801b3006700: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ^ ffff8801b3006780: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ffff8801b3006800: fb fb fb fb fc fc fc fc 05 fc fc fc fc fc fc fc ==================================================================