linux-kernel - memory leak in tty_init

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Message-ID: <0000000000006d68b60591482e7b@google.com>
Date:   Thu, 29 Aug 2019 14:28:06 -0700
From:   syzbot <syzbot+f303e045423e617d2cad@...kaller.appspotmail.com>
To:     gregkh@...uxfoundation.org, jslaby@...e.com,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: memory leak in tty_init_dev

Hello,

syzbot found the following crash on:

HEAD commit:    e67095fd Merge tag 'dma-mapping-5.3-5' of git://git.infrad..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13c3d12e600000
kernel config:  https://syzkaller.appspot.com/x/.config?x=54b8fd94a3dbefa6
dashboard link: https://syzkaller.appspot.com/bug?extid=f303e045423e617d2cad
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1012efac600000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16c55b5a600000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+f303e045423e617d2cad@...kaller.appspotmail.com

executing program
BUG: memory leak
unreferenced object 0xffff88810c784400 (size 1024):
   comm "syz-executor944", pid 6967, jiffies 4294954446 (age 24.290s)
   hex dump (first 32 bytes):
     01 54 00 00 01 00 00 00 00 00 00 00 00 00 00 00  .T..............
     40 0e f4 19 82 88 ff ff c0 80 9b 83 ff ff ff ff  @...............
   backtrace:
     [<000000007df0b09a>] kmemleak_alloc_recursive  
include/linux/kmemleak.h:43 [inline]
     [<000000007df0b09a>] slab_post_alloc_hook mm/slab.h:522 [inline]
     [<000000007df0b09a>] slab_alloc mm/slab.c:3319 [inline]
     [<000000007df0b09a>] kmem_cache_alloc_trace+0x145/0x2c0 mm/slab.c:3548
     [<000000005f2271b8>] kmalloc include/linux/slab.h:552 [inline]
     [<000000005f2271b8>] kzalloc include/linux/slab.h:748 [inline]
     [<000000005f2271b8>] alloc_tty_struct+0x3f/0x290  
drivers/tty/tty_io.c:2981
     [<000000003fdbcff2>] tty_init_dev drivers/tty/tty_io.c:1333 [inline]
     [<000000003fdbcff2>] tty_init_dev+0x4b/0x210 drivers/tty/tty_io.c:1317
     [<00000000e9e89905>] ptmx_open drivers/tty/pty.c:845 [inline]
     [<00000000e9e89905>] ptmx_open+0xba/0x1c0 drivers/tty/pty.c:811
     [<00000000fb3f1a7b>] chrdev_open+0xe3/0x290 fs/char_dev.c:414
     [<000000008bb452a9>] do_dentry_open+0x199/0x4f0 fs/open.c:797
     [<00000000040a1756>] vfs_open+0x35/0x40 fs/open.c:906
     [<00000000bc82caf4>] do_last fs/namei.c:3416 [inline]
     [<00000000bc82caf4>] path_openat+0x854/0x1cd0 fs/namei.c:3533
     [<00000000451a136c>] do_filp_open+0xaa/0x130 fs/namei.c:3563
     [<00000000dc54a590>] do_sys_open+0x253/0x330 fs/open.c:1089
     [<00000000b9b63e44>] __do_sys_openat fs/open.c:1116 [inline]
     [<00000000b9b63e44>] __se_sys_openat fs/open.c:1110 [inline]
     [<00000000b9b63e44>] __x64_sys_openat+0x24/0x30 fs/open.c:1110
     [<00000000d5a75d56>] do_syscall_64+0x76/0x1a0  
arch/x86/entry/common.c:296
     [<00000000949e5897>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff88810b349a00 (size 512):
   comm "syz-executor944", pid 6967, jiffies 4294954446 (age 24.290s)
   hex dump (first 32 bytes):
     50 9a 34 0b 81 88 ff ff e0 ff ff ff 0f 00 00 00  P.4.............
     10 9a 34 0b 81 88 ff ff 10 9a 34 0b 81 88 ff ff  ..4.......4.....
   backtrace:
     [<000000007df0b09a>] kmemleak_alloc_recursive  
include/linux/kmemleak.h:43 [inline]
     [<000000007df0b09a>] slab_post_alloc_hook mm/slab.h:522 [inline]
     [<000000007df0b09a>] slab_alloc mm/slab.c:3319 [inline]
     [<000000007df0b09a>] kmem_cache_alloc_trace+0x145/0x2c0 mm/slab.c:3548
     [<000000000720d4d4>] kmalloc include/linux/slab.h:552 [inline]
     [<000000000720d4d4>] pty_common_install+0x67/0x2b0 drivers/tty/pty.c:392
     [<000000006f2c2dd7>] pty_unix98_install+0x20/0x30 drivers/tty/pty.c:740
     [<000000005420e709>] tty_driver_install_tty drivers/tty/tty_io.c:1227  
[inline]
     [<000000005420e709>] tty_init_dev drivers/tty/tty_io.c:1340 [inline]
     [<000000005420e709>] tty_init_dev+0x86/0x210 drivers/tty/tty_io.c:1317
     [<00000000e9e89905>] ptmx_open drivers/tty/pty.c:845 [inline]
     [<00000000e9e89905>] ptmx_open+0xba/0x1c0 drivers/tty/pty.c:811
     [<00000000fb3f1a7b>] chrdev_open+0xe3/0x290 fs/char_dev.c:414
     [<000000008bb452a9>] do_dentry_open+0x199/0x4f0 fs/open.c:797
     [<00000000040a1756>] vfs_open+0x35/0x40 fs/open.c:906
     [<00000000bc82caf4>] do_last fs/namei.c:3416 [inline]
     [<00000000bc82caf4>] path_openat+0x854/0x1cd0 fs/namei.c:3533
     [<00000000451a136c>] do_filp_open+0xaa/0x130 fs/namei.c:3563
     [<00000000dc54a590>] do_sys_open+0x253/0x330 fs/open.c:1089
     [<00000000b9b63e44>] __do_sys_openat fs/open.c:1116 [inline]
     [<00000000b9b63e44>] __se_sys_openat fs/open.c:1110 [inline]
     [<00000000b9b63e44>] __x64_sys_openat+0x24/0x30 fs/open.c:1110
     [<00000000d5a75d56>] do_syscall_64+0x76/0x1a0  
arch/x86/entry/common.c:296
     [<00000000949e5897>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff88810c784400 (size 1024):
   comm "syz-executor944", pid 6967, jiffies 4294954446 (age 26.910s)
   hex dump (first 32 bytes):
     01 54 00 00 01 00 00 00 00 00 00 00 00 00 00 00  .T..............
     40 0e f4 19 82 88 ff ff c0 80 9b 83 ff ff ff ff  @...............
   backtrace:
     [<000000007df0b09a>] kmemleak_alloc_recursive  
include/linux/kmemleak.h:43 [inline]
     [<000000007df0b09a>] slab_post_alloc_hook mm/slab.h:522 [inline]
     [<000000007df0b09a>] slab_alloc mm/slab.c:3319 [inline]
     [<000000007df0b09a>] kmem_cache_alloc_trace+0x145/0x2c0 mm/slab.c:3548
     [<000000005f2271b8>] kmalloc include/linux/slab.h:552 [inline]
     [<000000005f2271b8>] kzalloc include/linux/slab.h:748 [inline]
     [<000000005f2271b8>] alloc_tty_struct+0x3f/0x290  
drivers/tty/tty_io.c:2981
     [<000000003fdbcff2>] tty_init_dev drivers/tty/tty_io.c:1333 [inline]
     [<000000003fdbcff2>] tty_init_dev+0x4b/0x210 drivers/tty/tty_io.c:1317
     [<00000000e9e89905>] ptmx_open drivers/tty/pty.c:845 [inline]
     [<00000000e9e89905>] ptmx_open+0xba/0x1c0 drivers/tty/pty.c:811
     [<00000000fb3f1a7b>] chrdev_open+0xe3/0x290 fs/char_dev.c:414
     [<000000008bb452a9>] do_dentry_open+0x199/0x4f0 fs/open.c:797
     [<00000000040a1756>] vfs_open+0x35/0x40 fs/open.c:906
     [<00000000bc82caf4>] do_last fs/namei.c:3416 [inline]
     [<00000000bc82caf4>] path_openat+0x854/0x1cd0 fs/namei.c:3533
     [<00000000451a136c>] do_filp_open+0xaa/0x130 fs/namei.c:3563
     [<00000000dc54a590>] do_sys_open+0x253/0x330 fs/open.c:1089
     [<00000000b9b63e44>] __do_sys_openat fs/open.c:1116 [inline]
     [<00000000b9b63e44>] __se_sys_openat fs/open.c:1110 [inline]
     [<00000000b9b63e44>] __x64_sys_openat+0x24/0x30 fs/open.c:1110
     [<00000000d5a75d56>] do_syscall_64+0x76/0x1a0  
arch/x86/entry/common.c:296
     [<00000000949e5897>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff88810b349a00 (size 512):
   comm "syz-executor944", pid 6967, jiffies 4294954446 (age 26.910s)
   hex dump (first 32 bytes):
     50 9a 34 0b 81 88 ff ff e0 ff ff ff 0f 00 00 00  P.4.............
     10 9a 34 0b 81 88 ff ff 10 9a 34 0b 81 88 ff ff  ..4.......4.....
   backtrace:
     [<000000007df0b09a>] kmemleak_alloc_recursive  
include/linux/kmemleak.h:43 [inline]
     [<000000007df0b09a>] slab_post_alloc_hook mm/slab.h:522 [inline]
     [<000000007df0b09a>] slab_alloc mm/slab.c:3319 [inline]
     [<000000007df0b09a>] kmem_cache_alloc_trace+0x145/0x2c0 mm/slab.c:3548
     [<000000000720d4d4>] kmalloc include/linux/slab.h:552 [inline]
     [<000000000720d4d4>] pty_common_install+0x67/0x2b0 drivers/tty/pty.c:392
     [<000000006f2c2dd7>] pty_unix98_install+0x20/0x30 drivers/tty/pty.c:740
     [<000000005420e709>] tty_driver_install_tty drivers/tty/tty_io.c:1227  
[inline]
     [<000000005420e709>] tty_init_dev drivers/tty/tty_io.c:1340 [inline]
     [<000000005420e709>] tty_init_dev+0x86/0x210 drivers/tty/tty_io.c:1317
     [<00000000e9e89905>] ptmx_open drivers/tty/pty.c:845 [inline]
     [<00000000e9e89905>] ptmx_open+0xba/0x1c0 drivers/tty/pty.c:811
     [<00000000fb3f1a7b>] chrdev_open+0xe3/0x290 fs/char_dev.c:414
     [<000000008bb452a9>] do_dentry_open+0x199/0x4f0 fs/open.c:797
     [<00000000040a1756>] vfs_open+0x35/0x40 fs/open.c:906
     [<00000000bc82caf4>] do_last fs/namei.c:3416 [inline]
     [<00000000bc82caf4>] path_openat+0x854/0x1cd0 fs/namei.c:3533
     [<00000000451a136c>] do_filp_open+0xaa/0x130 fs/namei.c:3563
     [<00000000dc54a590>] do_sys_open+0x253/0x330 fs/open.c:1089
     [<00000000b9b63e44>] __do_sys_openat fs/open.c:1116 [inline]
     [<00000000b9b63e44>] __se_sys_openat fs/open.c:1110 [inline]
     [<00000000b9b63e44>] __x64_sys_openat+0x24/0x30 fs/open.c:1110
     [<00000000d5a75d56>] do_syscall_64+0x76/0x1a0  
arch/x86/entry/common.c:296
     [<00000000949e5897>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff88810c784400 (size 1024):
   comm "syz-executor944", pid 6967, jiffies 4294954446 (age 29.510s)
   hex dump (first 32 bytes):
     01 54 00 00 01 00 00 00 00 00 00 00 00 00 00 00  .T..............
     40 0e f4 19 82 88 ff ff c0 80 9b 83 ff ff ff ff  @...............
   backtrace:
     [<000000007df0b09a>] kmemleak_alloc_recursive  
include/linux/kmemleak.h:43 [inline]
     [<000000007df0b09a>] slab_post_alloc_hook mm/slab.h:522 [inline]
     [<000000007df0b09a>] slab_alloc mm/slab.c:3319 [inline]
     [<000000007df0b09a>] kmem_cache_alloc_trace+0x145/0x2c0 mm/slab.c:3548
     [<000000005f2271b8>] kmalloc include/linux/slab.h:552 [inline]
     [<000000005f2271b8>] kzalloc include/linux/slab.h:748 [inline]
     [<000000005f2271b8>] alloc_tty_struct+0x3f/0x290  
drivers/tty/tty_io.c:2981
     [<000000003fdbcff2>] tty_init_dev drivers/tty/tty_io.c:1333 [inline]
     [<000000003fdbcff2>] tty_init_dev+0x4b/0x210 drivers/tty/tty_io.c:1317
     [<00000000e9e89905>] ptmx_open drivers/tty/pty.c:845 [inline]
     [<00000000e9e89905>] ptmx_open+0xba/0x1c0 drivers/tty/pty.c:811
     [<00000000fb3f1a7b>] chrdev_open+0xe3/0x290 fs/char_dev.c:414
     [<000000008bb452a9>] do_dentry_open+0x199/0x4f0 fs/open.c:797
     [<00000000040a1756>] vfs_open+0x35/0x40 fs/open.c:906
     [<00000000bc82caf4>] do_last fs/namei.c:3416 [inline]
     [<00000000bc82caf4>] path_openat+0x854/0x1cd0 fs/namei.c:3533
     [<00000000451a136c>] do_filp_open+0xaa/0x130 fs/namei.c:3563
     [<00000000dc54a590>] do_sys_open+0x253/0x330 fs/open.c:1089
     [<00000000b9b63e44>] __do_sys_openat fs/open.c:1116 [inline]
     [<00000000b9b63e44>] __se_sys_openat fs/open.c:1110 [inline]
     [<00000000b9b63e44>] __x64_sys_openat+0x24/0x30 fs/open.c:1110
     [<00000000d5a75d56>] do_syscall_64+0x76/0x1a0  
arch/x86/entry/common.c:296
     [<00000000949e5897>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff88810b349a00 (size 512):
   comm "syz-executor944", pid 6967, jiffies 4294954446 (age 29.510s)
   hex dump (first 32 bytes):
     50 9a 34 0b 81 88 ff ff e0 ff ff ff 0f 00 00 00  P.4.............
     10 9a 34 0b 81 88 ff ff 10 9a 34 0b 81 88 ff ff  ..4.......4.....
   backtrace:
     [<000000007df0b09a>] kmemleak_alloc_recursive  
include/linux/kmemleak.h:43 [inline]
     [<000000007df0b09a>] slab_post_alloc_hook mm/slab.h:522 [inline]
     [<000000007df0b09a>] slab_alloc mm/slab.c:3319 [inline]
     [<000000007df0b09a>] kmem_cache_alloc_trace+0x145/0x2c0 mm/slab.c:3548
     [<000000000720d4d4>] kmalloc include/linux/slab.h:552 [inline]
     [<000000000720d4d4>] pty_common_install+0x67/0x2b0 drivers/tty/pty.c:392
     [<000000006f2c2dd7>] pty_unix98_install+0x20/0x30 drivers/tty/pty.c:740
     [<000000005420e709>] tty_driver_install_tty drivers/tty/tty_io.c:1227  
[inline]
     [<000000005420e709>] tty_init_dev drivers/tty/tty_io.c:1340 [inline]
     [<000000005420e709>] tty_init_dev+0x86/0x210 drivers/tty/tty_io.c:1317
     [<00000000e9e89905>] ptmx_open drivers/tty/pty.c:845 [inline]
     [<00000000e9e89905>] ptmx_open+0xba/0x1c0 drivers/tty/pty.c:811
     [<00000000fb3f1a7b>] chrdev_open+0xe3/0x290 fs/char_dev.c:414
     [<000000008bb452a9>] do_dentry_open+0x199/0x4f0 fs/open.c:797
     [<00000000040a1756>] vfs_open+0x35/0x40 fs/open.c:906
     [<00000000bc82caf4>] do_last fs/namei.c:3416 [inline]
     [<00000000bc82caf4>] path_openat+0x854/0x1cd0 fs/namei.c:3533
     [<00000000451a136c>] do_filp_open+0xaa/0x130 fs/namei.c:3563
     [<00000000dc54a590>] do_sys_open+0x253/0x330 fs/open.c:1089
     [<00000000b9b63e44>] __do_sys_openat fs/open.c:1116 [inline]
     [<00000000b9b63e44>] __se_sys_openat fs/open.c:1110 [inline]
     [<00000000b9b63e44>] __x64_sys_openat+0x24/0x30 fs/open.c:1110
     [<00000000d5a75d56>] do_syscall_64+0x76/0x1a0  
arch/x86/entry/common.c:296
     [<00000000949e5897>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff88810c784400 (size 1024):
   comm "syz-executor944", pid 6967, jiffies 4294954446 (age 30.840s)
   hex dump (first 32 bytes):
     01 54 00 00 01 00 00 00 00 00 00 00 00 00 00 00  .T..............
     40 0e f4 19 82 88 ff ff c0 80 9b 83 ff ff ff ff  @...............
   backtrace:
     [<000000007df0b09a>] kmemleak_alloc_recursive  
include/linux/kmemleak.h:43 [inline]
     [<000000007df0b09a>] slab_post_alloc_hook mm/slab.h:522 [inline]
     [<000000007df0b09a>] slab_alloc mm/slab.c:3319 [inline]
     [<000000007df0b09a>] kmem_cache_alloc_trace+0x145/0x2c0 mm/slab.c:3548
     [<000000005f2271b8>] kmalloc include/linux/slab.h:552 [inline]
     [<000000005f2271b8>] kzalloc include/linux/slab.h:748 [inline]
     [<000000005f2271b8>] alloc_tty_struct+0x3f/0x290  
drivers/tty/tty_io.c:2981
     [<000000003fdbcff2>] tty_init_dev drivers/tty/tty_io.c:1333 [inline]
     [<000000003fdbcff2>] tty_init_dev+0x4b/0x210 drivers/tty/tty_io.c:1317
     [<00000000e9e89905>] ptmx_open drivers/tty/pty.c:845 [inline]
     [<00000000e9e89905>] ptmx_open+0xba/0x1c0 drivers/tty/pty.c:811
     [<00000000fb3f1a7b>] chrdev_open+0xe3/0x290 fs/char_dev.c:414
     [<000000008bb452a9>] do_dentry_open+0x199/0x4f0 fs/open.c:797
     [<00000000040a1756>] vfs_open+0x35/0x40 fs/open.c:906
     [<00000000bc82caf4>] do_last fs/namei.c:3416 [inline]
     [<00000000bc82caf4>] path_openat+0x854/0x1cd0 fs/namei.c:3533
     [<00000000451a136c>] do_filp_open+0xaa/0x130 fs/namei.c:3563
     [<00000000dc54a590>] do_sys_open+0x253/0x330 fs/open.c:1089
     [<00000000b9b63e44>] __do_sys_openat fs/open.c:1116 [inline]
     [<00000000b9b63e44>] __se_sys_openat fs/open.c:1110 [inline]
     [<00000000b9b63e44>] __x64_sys_openat+0x24/0x30 fs/open.c:1110
     [<00000000d5a75d56>] do_syscall_64+0x76/0x1a0  
arch/x86/entry/common.c:296
     [<00000000949e5897>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff88810b349a00 (size 512):
   comm "syz-executor944", pid 6967, jiffies 4294954446 (age 30.840s)
   hex dump (first 32 bytes):
     50 9a 34 0b 81 88 ff ff e0 ff ff ff 0f 00 00 00  P.4.............
     10 9a 34 0b 81 88 ff ff 10 9a 34 0b 81 88 ff ff  ..4.......4.....
   backtrace:
     [<000000007df0b09a>] kmemleak_alloc_recursive  
include/linux/kmemleak.h:43 [inline]
     [<000000007df0b09a>] slab_post_alloc_hook mm/slab.h:522 [inline]
     [<000000007df0b09a>] slab_alloc mm/slab.c:3319 [inline]
     [<000000007df0b09a>] kmem_cache_alloc_trace+0x145/0x2c0 mm/slab.c:3548
     [<000000000720d4d4>] kmalloc include/linux/slab.h:552 [inline]
     [<000000000720d4d4>] pty_common_install+0x67/0x2b0 drivers/tty/pty.c:392
     [<000000006f2c2dd7>] pty_unix98_install+0x20/0x30 drivers/tty/pty.c:740
     [<000000005420e709>] tty_driver_install_tty drivers/tty/tty_io.c:1227  
[inline]
     [<000000005420e709>] tty_init_dev drivers/tty/tty_io.c:1340 [inline]
     [<000000005420e709>] tty_init_dev+0x86/0x210 drivers/tty/tty_io.c:1317
     [<00000000e9e89905>] ptmx_open drivers/tty/pty.c:845 [inline]
     [<00000000e9e89905>] ptmx_open+0xba/0x1c0 drivers/tty/pty.c:811
     [<00000000fb3f1a7b>] chrdev_open+0xe3/0x290 fs/char_dev.c:414
     [<000000008bb452a9>] do_dentry_open+0x199/0x4f0 fs/open.c:797
     [<00000000040a1756>] vfs_open+0x35/0x40 fs/open.c:906
     [<00000000bc82caf4>] do_last fs/namei.c:3416 [inline]
     [<00000000bc82caf4>] path_openat+0x854/0x1cd0 fs/namei.c:3533
     [<00000000451a136c>] do_filp_open+0xaa/0x130 fs/namei.c:3563
     [<00000000dc54a590>] do_sys_open+0x253/0x330 fs/open.c:1089
     [<00000000b9b63e44>] __do_sys_openat fs/open.c:1116 [inline]
     [<00000000b9b63e44>] __se_sys_openat fs/open.c:1110 [inline]
     [<00000000b9b63e44>] __x64_sys_openat+0x24/0x30 fs/open.c:1110
     [<00000000d5a75d56>] do_syscall_64+0x76/0x1a0  
arch/x86/entry/common.c:296
     [<00000000949e5897>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

executing program
executing program


---
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See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@...glegroups.com.

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syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches