memory leak in tty_init

memory leak in tty_init_dev
Status: upstream: reported C repro on 2019/08/29 21:28
Reported-by: syzbot+f303e045423e617d2cad@syzkaller.appspotmail.com
First crash: 421d, last: 346d
Patch testing requests:
Created	Duration	User	Patch	Repo	Result
2020/09/23 10:40	3m	anant.thazhemadam@gmail.com		upstream	error
Sample crash report:
executing program
executing program
executing program
executing program
BUG: memory leak
unreferenced object 0xffff88811432f400 (size 1024):
  comm "syz-executor109", pid 7171, jiffies 4294946509 (age 20.490s)
  hex dump (first 32 bytes):
    01 54 00 00 01 00 00 00 00 00 00 00 00 00 00 00  .T..............
    c0 29 0b 1b 82 88 ff ff e0 a2 9b 83 ff ff ff ff  .)..............
  backtrace:
    [<00000000aab3021c>] kmemleak_alloc_recursive include/linux/kmemleak.h:43 [inline]
    [<00000000aab3021c>] slab_post_alloc_hook mm/slab.h:586 [inline]
    [<00000000aab3021c>] slab_alloc mm/slab.c:3319 [inline]
    [<00000000aab3021c>] kmem_cache_alloc_trace+0x145/0x2c0 mm/slab.c:3548
    [<0000000029ea7e5a>] kmalloc include/linux/slab.h:556 [inline]
    [<0000000029ea7e5a>] kzalloc include/linux/slab.h:690 [inline]
    [<0000000029ea7e5a>] alloc_tty_struct+0x3f/0x290 drivers/tty/tty_io.c:2975
    [<00000000e8df01a7>] tty_init_dev drivers/tty/tty_io.c:1333 [inline]
    [<00000000e8df01a7>] tty_init_dev+0x4b/0x210 drivers/tty/tty_io.c:1317
    [<000000003a42f38c>] ptmx_open drivers/tty/pty.c:845 [inline]
    [<000000003a42f38c>] ptmx_open+0xba/0x1c0 drivers/tty/pty.c:811
    [<0000000033c0879a>] chrdev_open+0xe3/0x290 fs/char_dev.c:414
    [<00000000755500d3>] do_dentry_open+0x199/0x500 fs/open.c:797
    [<00000000ebfbdaf1>] vfs_open+0x35/0x40 fs/open.c:914
    [<0000000064ec5cfc>] do_last fs/namei.c:3408 [inline]
    [<0000000064ec5cfc>] path_openat+0x854/0x1e30 fs/namei.c:3525
    [<000000001f11c5e6>] do_filp_open+0xaa/0x130 fs/namei.c:3555
    [<00000000a4d8b7f1>] do_sys_open+0x253/0x330 fs/open.c:1097
    [<00000000eeaff1b2>] __do_sys_openat fs/open.c:1124 [inline]
    [<00000000eeaff1b2>] __se_sys_openat fs/open.c:1118 [inline]
    [<00000000eeaff1b2>] __x64_sys_openat+0x24/0x30 fs/open.c:1118
    [<000000007b8f2030>] do_syscall_64+0x73/0x1f0 arch/x86/entry/common.c:290
    [<000000004b57a7b9>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff88811458dc00 (size 512):
  comm "syz-executor109", pid 7171, jiffies 4294946509 (age 20.490s)
  hex dump (first 32 bytes):
    50 dc 58 14 81 88 ff ff e0 ff ff ff 0f 00 00 00  P.X.............
    10 dc 58 14 81 88 ff ff 10 dc 58 14 81 88 ff ff  ..X.......X.....
  backtrace:
    [<00000000aab3021c>] kmemleak_alloc_recursive include/linux/kmemleak.h:43 [inline]
    [<00000000aab3021c>] slab_post_alloc_hook mm/slab.h:586 [inline]
    [<00000000aab3021c>] slab_alloc mm/slab.c:3319 [inline]
    [<00000000aab3021c>] kmem_cache_alloc_trace+0x145/0x2c0 mm/slab.c:3548
    [<00000000e3ddce84>] kmalloc include/linux/slab.h:556 [inline]
    [<00000000e3ddce84>] pty_common_install+0x67/0x2b0 drivers/tty/pty.c:392
    [<0000000045c447a3>] pty_unix98_install+0x20/0x30 drivers/tty/pty.c:740
    [<0000000076c7550a>] tty_driver_install_tty drivers/tty/tty_io.c:1227 [inline]
    [<0000000076c7550a>] tty_init_dev drivers/tty/tty_io.c:1340 [inline]
    [<0000000076c7550a>] tty_init_dev+0x86/0x210 drivers/tty/tty_io.c:1317
    [<000000003a42f38c>] ptmx_open drivers/tty/pty.c:845 [inline]
    [<000000003a42f38c>] ptmx_open+0xba/0x1c0 drivers/tty/pty.c:811
    [<0000000033c0879a>] chrdev_open+0xe3/0x290 fs/char_dev.c:414
    [<00000000755500d3>] do_dentry_open+0x199/0x500 fs/open.c:797
    [<00000000ebfbdaf1>] vfs_open+0x35/0x40 fs/open.c:914
    [<0000000064ec5cfc>] do_last fs/namei.c:3408 [inline]
    [<0000000064ec5cfc>] path_openat+0x854/0x1e30 fs/namei.c:3525
    [<000000001f11c5e6>] do_filp_open+0xaa/0x130 fs/namei.c:3555
    [<00000000a4d8b7f1>] do_sys_open+0x253/0x330 fs/open.c:1097
    [<00000000eeaff1b2>] __do_sys_openat fs/open.c:1124 [inline]
    [<00000000eeaff1b2>] __se_sys_openat fs/open.c:1118 [inline]
    [<00000000eeaff1b2>] __x64_sys_openat+0x24/0x30 fs/open.c:1118
    [<000000007b8f2030>] do_syscall_64+0x73/0x1f0 arch/x86/entry/common.c:290
    [<000000004b57a7b9>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff88811432f400 (size 1024):
  comm "syz-executor109", pid 7171, jiffies 4294946509 (age 21.750s)
  hex dump (first 32 bytes):
    01 54 00 00 01 00 00 00 00 00 00 00 00 00 00 00  .T..............
    c0 29 0b 1b 82 88 ff ff e0 a2 9b 83 ff ff ff ff  .)..............
  backtrace:
    [<00000000aab3021c>] kmemleak_alloc_recursive include/linux/kmemleak.h:43 [inline]
    [<00000000aab3021c>] slab_post_alloc_hook mm/slab.h:586 [inline]
    [<00000000aab3021c>] slab_alloc mm/slab.c:3319 [inline]
    [<00000000aab3021c>] kmem_cache_alloc_trace+0x145/0x2c0 mm/slab.c:3548
    [<0000000029ea7e5a>] kmalloc include/linux/slab.h:556 [inline]
    [<0000000029ea7e5a>] kzalloc include/linux/slab.h:690 [inline]
    [<0000000029ea7e5a>] alloc_tty_struct+0x3f/0x290 drivers/tty/tty_io.c:2975
    [<00000000e8df01a7>] tty_init_dev drivers/tty/tty_io.c:1333 [inline]
    [<00000000e8df01a7>] tty_init_dev+0x4b/0x210 drivers/tty/tty_io.c:1317
    [<000000003a42f38c>] ptmx_open drivers/tty/pty.c:845 [inline]
    [<000000003a42f38c>] ptmx_open+0xba/0x1c0 drivers/tty/pty.c:811
    [<0000000033c0879a>] chrdev_open+0xe3/0x290 fs/char_dev.c:414
    [<00000000755500d3>] do_dentry_open+0x199/0x500 fs/open.c:797
    [<00000000ebfbdaf1>] vfs_open+0x35/0x40 fs/open.c:914
    [<0000000064ec5cfc>] do_last fs/namei.c:3408 [inline]
    [<0000000064ec5cfc>] path_openat+0x854/0x1e30 fs/namei.c:3525
    [<000000001f11c5e6>] do_filp_open+0xaa/0x130 fs/namei.c:3555
    [<00000000a4d8b7f1>] do_sys_open+0x253/0x330 fs/open.c:1097
    [<00000000eeaff1b2>] __do_sys_openat fs/open.c:1124 [inline]
    [<00000000eeaff1b2>] __se_sys_openat fs/open.c:1118 [inline]
    [<00000000eeaff1b2>] __x64_sys_openat+0x24/0x30 fs/open.c:1118
    [<000000007b8f2030>] do_syscall_64+0x73/0x1f0 arch/x86/entry/common.c:290
    [<000000004b57a7b9>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff88811458dc00 (size 512):
  comm "syz-executor109", pid 7171, jiffies 4294946509 (age 21.750s)
  hex dump (first 32 bytes):
    50 dc 58 14 81 88 ff ff e0 ff ff ff 0f 00 00 00  P.X.............
    10 dc 58 14 81 88 ff ff 10 dc 58 14 81 88 ff ff  ..X.......X.....
  backtrace:
    [<00000000aab3021c>] kmemleak_alloc_recursive include/linux/kmemleak.h:43 [inline]
    [<00000000aab3021c>] slab_post_alloc_hook mm/slab.h:586 [inline]
    [<00000000aab3021c>] slab_alloc mm/slab.c:3319 [inline]
    [<00000000aab3021c>] kmem_cache_alloc_trace+0x145/0x2c0 mm/slab.c:3548
    [<00000000e3ddce84>] kmalloc include/linux/slab.h:556 [inline]
    [<00000000e3ddce84>] pty_common_install+0x67/0x2b0 drivers/tty/pty.c:392
    [<0000000045c447a3>] pty_unix98_install+0x20/0x30 drivers/tty/pty.c:740
    [<0000000076c7550a>] tty_driver_install_tty drivers/tty/tty_io.c:1227 [inline]
    [<0000000076c7550a>] tty_init_dev drivers/tty/tty_io.c:1340 [inline]
    [<0000000076c7550a>] tty_init_dev+0x86/0x210 drivers/tty/tty_io.c:1317
    [<000000003a42f38c>] ptmx_open drivers/tty/pty.c:845 [inline]
    [<000000003a42f38c>] ptmx_open+0xba/0x1c0 drivers/tty/pty.c:811
    [<0000000033c0879a>] chrdev_open+0xe3/0x290 fs/char_dev.c:414
    [<00000000755500d3>] do_dentry_open+0x199/0x500 fs/open.c:797
    [<00000000ebfbdaf1>] vfs_open+0x35/0x40 fs/open.c:914
    [<0000000064ec5cfc>] do_last fs/namei.c:3408 [inline]
    [<0000000064ec5cfc>] path_openat+0x854/0x1e30 fs/namei.c:3525
    [<000000001f11c5e6>] do_filp_open+0xaa/0x130 fs/namei.c:3555
    [<00000000a4d8b7f1>] do_sys_open+0x253/0x330 fs/open.c:1097
    [<00000000eeaff1b2>] __do_sys_openat fs/open.c:1124 [inline]
    [<00000000eeaff1b2>] __se_sys_openat fs/open.c:1118 [inline]
    [<00000000eeaff1b2>] __x64_sys_openat+0x24/0x30 fs/open.c:1118
    [<000000007b8f2030>] do_syscall_64+0x73/0x1f0 arch/x86/entry/common.c:290
    [<000000004b57a7b9>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff88811432f400 (size 1024):
  comm "syz-executor109", pid 7171, jiffies 4294946509 (age 23.010s)
  hex dump (first 32 bytes):
    01 54 00 00 01 00 00 00 00 00 00 00 00 00 00 00  .T..............
    c0 29 0b 1b 82 88 ff ff e0 a2 9b 83 ff ff ff ff  .)..............
  backtrace:
    [<00000000aab3021c>] kmemleak_alloc_recursive include/linux/kmemleak.h:43 [inline]
    [<00000000aab3021c>] slab_post_alloc_hook mm/slab.h:586 [inline]
    [<00000000aab3021c>] slab_alloc mm/slab.c:3319 [inline]
    [<00000000aab3021c>] kmem_cache_alloc_trace+0x145/0x2c0 mm/slab.c:3548
    [<0000000029ea7e5a>] kmalloc include/linux/slab.h:556 [inline]
    [<0000000029ea7e5a>] kzalloc include/linux/slab.h:690 [inline]
    [<0000000029ea7e5a>] alloc_tty_struct+0x3f/0x290 drivers/tty/tty_io.c:2975
    [<00000000e8df01a7>] tty_init_dev drivers/tty/tty_io.c:1333 [inline]
    [<00000000e8df01a7>] tty_init_dev+0x4b/0x210 drivers/tty/tty_io.c:1317
    [<000000003a42f38c>] ptmx_open drivers/tty/pty.c:845 [inline]
    [<000000003a42f38c>] ptmx_open+0xba/0x1c0 drivers/tty/pty.c:811
    [<0000000033c0879a>] chrdev_open+0xe3/0x290 fs/char_dev.c:414
    [<00000000755500d3>] do_dentry_open+0x199/0x500 fs/open.c:797
    [<00000000ebfbdaf1>] vfs_open+0x35/0x40 fs/open.c:914
    [<0000000064ec5cfc>] do_last fs/namei.c:3408 [inline]
    [<0000000064ec5cfc>] path_openat+0x854/0x1e30 fs/namei.c:3525
    [<000000001f11c5e6>] do_filp_open+0xaa/0x130 fs/namei.c:3555
    [<00000000a4d8b7f1>] do_sys_open+0x253/0x330 fs/open.c:1097
    [<00000000eeaff1b2>] __do_sys_openat fs/open.c:1124 [inline]
    [<00000000eeaff1b2>] __se_sys_openat fs/open.c:1118 [inline]
    [<00000000eeaff1b2>] __x64_sys_openat+0x24/0x30 fs/open.c:1118
    [<000000007b8f2030>] do_syscall_64+0x73/0x1f0 arch/x86/entry/common.c:290
    [<000000004b57a7b9>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff88811458dc00 (size 512):
  comm "syz-executor109", pid 7171, jiffies 4294946509 (age 23.010s)
  hex dump (first 32 bytes):
    50 dc 58 14 81 88 ff ff e0 ff ff ff 0f 00 00 00  P.X.............
    10 dc 58 14 81 88 ff ff 10 dc 58 14 81 88 ff ff  ..X.......X.....
  backtrace:
    [<00000000aab3021c>] kmemleak_alloc_recursive include/linux/kmemleak.h:43 [inline]
    [<00000000aab3021c>] slab_post_alloc_hook mm/slab.h:586 [inline]
    [<00000000aab3021c>] slab_alloc mm/slab.c:3319 [inline]
    [<00000000aab3021c>] kmem_cache_alloc_trace+0x145/0x2c0 mm/slab.c:3548
    [<00000000e3ddce84>] kmalloc include/linux/slab.h:556 [inline]
    [<00000000e3ddce84>] pty_common_install+0x67/0x2b0 drivers/tty/pty.c:392
    [<0000000045c447a3>] pty_unix98_install+0x20/0x30 drivers/tty/pty.c:740
    [<0000000076c7550a>] tty_driver_install_tty drivers/tty/tty_io.c:1227 [inline]
    [<0000000076c7550a>] tty_init_dev drivers/tty/tty_io.c:1340 [inline]
    [<0000000076c7550a>] tty_init_dev+0x86/0x210 drivers/tty/tty_io.c:1317
    [<000000003a42f38c>] ptmx_open drivers/tty/pty.c:845 [inline]
    [<000000003a42f38c>] ptmx_open+0xba/0x1c0 drivers/tty/pty.c:811
    [<0000000033c0879a>] chrdev_open+0xe3/0x290 fs/char_dev.c:414
    [<00000000755500d3>] do_dentry_open+0x199/0x500 fs/open.c:797
    [<00000000ebfbdaf1>] vfs_open+0x35/0x40 fs/open.c:914
    [<0000000064ec5cfc>] do_last fs/namei.c:3408 [inline]
    [<0000000064ec5cfc>] path_openat+0x854/0x1e30 fs/namei.c:3525
    [<000000001f11c5e6>] do_filp_open+0xaa/0x130 fs/namei.c:3555
    [<00000000a4d8b7f1>] do_sys_open+0x253/0x330 fs/open.c:1097
    [<00000000eeaff1b2>] __do_sys_openat fs/open.c:1124 [inline]
    [<00000000eeaff1b2>] __se_sys_openat fs/open.c:1118 [inline]
    [<00000000eeaff1b2>] __x64_sys_openat+0x24/0x30 fs/open.c:1118
    [<000000007b8f2030>] do_syscall_64+0x73/0x1f0 arch/x86/entry/common.c:290
    [<000000004b57a7b9>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff88811432f400 (size 1024):
  comm "syz-executor109", pid 7171, jiffies 4294946509 (age 24.270s)
  hex dump (first 32 bytes):
    01 54 00 00 01 00 00 00 00 00 00 00 00 00 00 00  .T..............
    c0 29 0b 1b 82 88 ff ff e0 a2 9b 83 ff ff ff ff  .)..............
  backtrace:
    [<00000000aab3021c>] kmemleak_alloc_recursive include/linux/kmemleak.h:43 [inline]
    [<00000000aab3021c>] slab_post_alloc_hook mm/slab.h:586 [inline]
    [<00000000aab3021c>] slab_alloc mm/slab.c:3319 [inline]
    [<00000000aab3021c>] kmem_cache_alloc_trace+0x145/0x2c0 mm/slab.c:3548
    [<0000000029ea7e5a>] kmalloc include/linux/slab.h:556 [inline]
    [<0000000029ea7e5a>] kzalloc include/linux/slab.h:690 [inline]
    [<0000000029ea7e5a>] alloc_tty_struct+0x3f/0x290 drivers/tty/tty_io.c:2975
    [<00000000e8df01a7>] tty_init_dev drivers/tty/tty_io.c:1333 [inline]
    [<00000000e8df01a7>] tty_init_dev+0x4b/0x210 drivers/tty/tty_io.c:1317
    [<000000003a42f38c>] ptmx_open drivers/tty/pty.c:845 [inline]
    [<000000003a42f38c>] ptmx_open+0xba/0x1c0 drivers/tty/pty.c:811
    [<0000000033c0879a>] chrdev_open+0xe3/0x290 fs/char_dev.c:414
    [<00000000755500d3>] do_dentry_open+0x199/0x500 fs/open.c:797
    [<00000000ebfbdaf1>] vfs_open+0x35/0x40 fs/open.c:914
    [<0000000064ec5cfc>] do_last fs/namei.c:3408 [inline]
    [<0000000064ec5cfc>] path_openat+0x854/0x1e30 fs/namei.c:3525
    [<000000001f11c5e6>] do_filp_open+0xaa/0x130 fs/namei.c:3555
    [<00000000a4d8b7f1>] do_sys_open+0x253/0x330 fs/open.c:1097
    [<00000000eeaff1b2>] __do_sys_openat fs/open.c:1124 [inline]
    [<00000000eeaff1b2>] __se_sys_openat fs/open.c:1118 [inline]
    [<00000000eeaff1b2>] __x64_sys_openat+0x24/0x30 fs/open.c:1118
    [<000000007b8f2030>] do_syscall_64+0x73/0x1f0 arch/x86/entry/common.c:290
    [<000000004b57a7b9>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff88811458dc00 (size 512):
  comm "syz-executor109", pid 7171, jiffies 4294946509 (age 24.270s)
  hex dump (first 32 bytes):
    50 dc 58 14 81 88 ff ff e0 ff ff ff 0f 00 00 00  P.X.............
    10 dc 58 14 81 88 ff ff 10 dc 58 14 81 88 ff ff  ..X.......X.....
  backtrace:
    [<00000000aab3021c>] kmemleak_alloc_recursive include/linux/kmemleak.h:43 [inline]
    [<00000000aab3021c>] slab_post_alloc_hook mm/slab.h:586 [inline]
    [<00000000aab3021c>] slab_alloc mm/slab.c:3319 [inline]
    [<00000000aab3021c>] kmem_cache_alloc_trace+0x145/0x2c0 mm/slab.c:3548
    [<00000000e3ddce84>] kmalloc include/linux/slab.h:556 [inline]
    [<00000000e3ddce84>] pty_common_install+0x67/0x2b0 drivers/tty/pty.c:392
    [<0000000045c447a3>] pty_unix98_install+0x20/0x30 drivers/tty/pty.c:740
    [<0000000076c7550a>] tty_driver_install_tty drivers/tty/tty_io.c:1227 [inline]
    [<0000000076c7550a>] tty_init_dev drivers/tty/tty_io.c:1340 [inline]
    [<0000000076c7550a>] tty_init_dev+0x86/0x210 drivers/tty/tty_io.c:1317
    [<000000003a42f38c>] ptmx_open drivers/tty/pty.c:845 [inline]
    [<000000003a42f38c>] ptmx_open+0xba/0x1c0 drivers/tty/pty.c:811
    [<0000000033c0879a>] chrdev_open+0xe3/0x290 fs/char_dev.c:414
    [<00000000755500d3>] do_dentry_open+0x199/0x500 fs/open.c:797
    [<00000000ebfbdaf1>] vfs_open+0x35/0x40 fs/open.c:914
    [<0000000064ec5cfc>] do_last fs/namei.c:3408 [inline]
    [<0000000064ec5cfc>] path_openat+0x854/0x1e30 fs/namei.c:3525
    [<000000001f11c5e6>] do_filp_open+0xaa/0x130 fs/namei.c:3555
    [<00000000a4d8b7f1>] do_sys_open+0x253/0x330 fs/open.c:1097
    [<00000000eeaff1b2>] __do_sys_openat fs/open.c:1124 [inline]
    [<00000000eeaff1b2>] __se_sys_openat fs/open.c:1118 [inline]
    [<00000000eeaff1b2>] __x64_sys_openat+0x24/0x30 fs/open.c:1118
    [<000000007b8f2030>] do_syscall_64+0x73/0x1f0 arch/x86/entry/common.c:290
    [<000000004b57a7b9>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff88811432f400 (size 1024):
  comm "syz-executor109", pid 7171, jiffies 4294946509 (age 25.540s)
  hex dump (first 32 bytes):
    01 54 00 00 01 00 00 00 00 00 00 00 00 00 00 00  .T..............
    c0 29 0b 1b 82 88 ff ff e0 a2 9b 83 ff ff ff ff  .)..............
  backtrace:
    [<00000000aab3021c>] kmemleak_alloc_recursive include/linux/kmemleak.h:43 [inline]
    [<00000000aab3021c>] slab_post_alloc_hook mm/slab.h:586 [inline]
    [<00000000aab3021c>] slab_alloc mm/slab.c:3319 [inline]
    [<00000000aab3021c>] kmem_cache_alloc_trace+0x145/0x2c0 mm/slab.c:3548
    [<0000000029ea7e5a>] kmalloc include/linux/slab.h:556 [inline]
    [<0000000029ea7e5a>] kzalloc include/linux/slab.h:690 [inline]
    [<0000000029ea7e5a>] alloc_tty_struct+0x3f/0x290 drivers/tty/tty_io.c:2975
    [<00000000e8df01a7>] tty_init_dev drivers/tty/tty_io.c:1333 [inline]
    [<00000000e8df01a7>] tty_init_dev+0x4b/0x210 drivers/tty/tty_io.c:1317
    [<000000003a42f38c>] ptmx_open drivers/tty/pty.c:845 [inline]
    [<000000003a42f38c>] ptmx_open+0xba/0x1c0 drivers/tty/pty.c:811
    [<0000000033c0879a>] chrdev_open+0xe3/0x290 fs/char_dev.c:414
    [<00000000755500d3>] do_dentry_open+0x199/0x500 fs/open.c:797
    [<00000000ebfbdaf1>] vfs_open+0x35/0x40 fs/open.c:914
    [<0000000064ec5cfc>] do_last fs/namei.c:3408 [inline]
    [<0000000064ec5cfc>] path_openat+0x854/0x1e30 fs/namei.c:3525
    [<000000001f11c5e6>] do_filp_open+0xaa/0x130 fs/namei.c:3555
    [<00000000a4d8b7f1>] do_sys_open+0x253/0x330 fs/open.c:1097
    [<00000000eeaff1b2>] __do_sys_openat fs/open.c:1124 [inline]
    [<00000000eeaff1b2>] __se_sys_openat fs/open.c:1118 [inline]
    [<00000000eeaff1b2>] __x64_sys_openat+0x24/0x30 fs/open.c:1118
    [<000000007b8f2030>] do_syscall_64+0x73/0x1f0 arch/x86/entry/common.c:290
    [<000000004b57a7b9>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff88811458dc00 (size 512):
  comm "syz-executor109", pid 7171, jiffies 4294946509 (age 25.540s)
  hex dump (first 32 bytes):
    50 dc 58 14 81 88 ff ff e0 ff ff ff 0f 00 00 00  P.X.............
    10 dc 58 14 81 88 ff ff 10 dc 58 14 81 88 ff ff  ..X.......X.....
  backtrace:
    [<00000000aab3021c>] kmemleak_alloc_recursive include/linux/kmemleak.h:43 [inline]
    [<00000000aab3021c>] slab_post_alloc_hook mm/slab.h:586 [inline]
    [<00000000aab3021c>] slab_alloc mm/slab.c:3319 [inline]
    [<00000000aab3021c>] kmem_cache_alloc_trace+0x145/0x2c0 mm/slab.c:3548
    [<00000000e3ddce84>] kmalloc include/linux/slab.h:556 [inline]
    [<00000000e3ddce84>] pty_common_install+0x67/0x2b0 drivers/tty/pty.c:392
    [<0000000045c447a3>] pty_unix98_install+0x20/0x30 drivers/tty/pty.c:740
    [<0000000076c7550a>] tty_driver_install_tty drivers/tty/tty_io.c:1227 [inline]
    [<0000000076c7550a>] tty_init_dev drivers/tty/tty_io.c:1340 [inline]
    [<0000000076c7550a>] tty_init_dev+0x86/0x210 drivers/tty/tty_io.c:1317
    [<000000003a42f38c>] ptmx_open drivers/tty/pty.c:845 [inline]
    [<000000003a42f38c>] ptmx_open+0xba/0x1c0 drivers/tty/pty.c:811
    [<0000000033c0879a>] chrdev_open+0xe3/0x290 fs/char_dev.c:414
    [<00000000755500d3>] do_dentry_open+0x199/0x500 fs/open.c:797
    [<00000000ebfbdaf1>] vfs_open+0x35/0x40 fs/open.c:914
    [<0000000064ec5cfc>] do_last fs/namei.c:3408 [inline]
    [<0000000064ec5cfc>] path_openat+0x854/0x1e30 fs/namei.c:3525
    [<000000001f11c5e6>] do_filp_open+0xaa/0x130 fs/namei.c:3555
    [<00000000a4d8b7f1>] do_sys_open+0x253/0x330 fs/open.c:1097
    [<00000000eeaff1b2>] __do_sys_openat fs/open.c:1124 [inline]
    [<00000000eeaff1b2>] __se_sys_openat fs/open.c:1118 [inline]
    [<00000000eeaff1b2>] __x64_sys_openat+0x24/0x30 fs/open.c:1118
    [<000000007b8f2030>] do_syscall_64+0x73/0x1f0 arch/x86/entry/common.c:290
    [<000000004b57a7b9>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

executing program
executing program
executing program
Crashes (3):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	Maintainers
ci-upstream-gce-leak	2019/10/31 05:58	upstream	320000e7	a41ca8fa	.config	log	report	syz	C	gregkh@linuxfoundation.org, jslaby@suse.com, linux-kernel@vger.kernel.org
ci-upstream-gce-leak	2019/08/25 19:38	upstream	e67095fd	d21c5d9d	.config	log	report	syz	C	gregkh@linuxfoundation.org, jslaby@suse.com, linux-kernel@vger.kernel.org
ci-upstream-gce-leak	2019/11/08 14:05	upstream	847120f8	1e35461e	.config	log	report	syz		gregkh@linuxfoundation.org, jslaby@suse.com, linux-kernel@vger.kernel.org