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1.0 X-Received: by 2002:a6b:6b01:: with SMTP id g1mr3648274ioc.196.1567114086145; Thu, 29 Aug 2019 14:28:06 -0700 (PDT) Date: Thu, 29 Aug 2019 14:28:06 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000006d68b60591482e7b@google.com> Subject: memory leak in tty_init_dev From: syzbot To: gregkh@linuxfoundation.org, jslaby@suse.com, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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@syzkaller.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 --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches