From mboxrd@z Thu Jan 1 00:00:00 1970 From: syzbot Subject: memory leak in lapb_register Date: Tue, 21 May 2019 06:43:06 -0700 Message-ID: <0000000000005c5d1d0589660769@google.com> Mime-Version: 1.0 Return-path: Sender: linux-kernel-owner@vger.kernel.org List-ID: Content-Type: text/plain; charset="us-ascii"; format="flowed"; delsp="yes" Content-Transfer-Encoding: 7bit To: davem@davemloft.net, linux-kernel@vger.kernel.org, linux-x25@vger.kernel.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com Hello, syzbot found the following crash on: HEAD commit: f49aa1de Merge tag 'for-5.2-rc1-tag' of git://git.kernel.o.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1042cd9ca00000 kernel config: https://syzkaller.appspot.com/x/.config?x=61dd9e15a761691d dashboard link: https://syzkaller.appspot.com/bug?extid=afb980676c836b4a0afa compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11ea4654a00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=100f6f44a00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+afb980676c836b4a0afa@syzkaller.appspotmail.com g: Permanently added '10.128.0.195' (ECDSA) to the list of known hosts. executing program executing program BUG: memory leak unreferenced object 0xffff88810dadc400 (size 256): comm "softirq", pid 0, jiffies 4294947366 (age 12.720s) hex dump (first 32 bytes): 00 01 00 00 00 00 ad de 00 02 00 00 00 00 ad de ................ 00 20 85 17 81 88 ff ff 00 00 00 00 00 00 00 00 . .............. backtrace: [<00000000fe4f5aaf>] kmemleak_alloc_recursive include/linux/kmemleak.h:55 [inline] [<00000000fe4f5aaf>] slab_post_alloc_hook mm/slab.h:439 [inline] [<00000000fe4f5aaf>] slab_alloc mm/slab.c:3326 [inline] [<00000000fe4f5aaf>] kmem_cache_alloc_trace+0x13d/0x280 mm/slab.c:3553 [<0000000050cea448>] kmalloc include/linux/slab.h:547 [inline] [<0000000050cea448>] kzalloc include/linux/slab.h:742 [inline] [<0000000050cea448>] lapb_create_cb net/lapb/lapb_iface.c:121 [inline] [<0000000050cea448>] lapb_register+0x90/0x1c0 net/lapb/lapb_iface.c:158 [<00000000c0d81e26>] x25_asy_open drivers/net/wan/x25_asy.c:482 [inline] [<00000000c0d81e26>] x25_asy_open_tty+0x26b/0x2f6 drivers/net/wan/x25_asy.c:572 [<00000000bdec8ae5>] tty_ldisc_open.isra.0+0x40/0x70 drivers/tty/tty_ldisc.c:469 [<000000004f64cfca>] tty_set_ldisc+0x149/0x240 drivers/tty/tty_ldisc.c:596 [<00000000d8b98e91>] tiocsetd drivers/tty/tty_io.c:2332 [inline] [<00000000d8b98e91>] tty_ioctl+0x366/0xa30 drivers/tty/tty_io.c:2592 [<00000000343f2123>] vfs_ioctl fs/ioctl.c:46 [inline] [<00000000343f2123>] file_ioctl fs/ioctl.c:509 [inline] [<00000000343f2123>] do_vfs_ioctl+0x62a/0x810 fs/ioctl.c:696 [<00000000b777b7e5>] ksys_ioctl+0x86/0xb0 fs/ioctl.c:713 [<0000000026d5db65>] __do_sys_ioctl fs/ioctl.c:720 [inline] [<0000000026d5db65>] __se_sys_ioctl fs/ioctl.c:718 [inline] [<0000000026d5db65>] __x64_sys_ioctl+0x1e/0x30 fs/ioctl.c:718 [<0000000006a4653e>] do_syscall_64+0x76/0x1a0 arch/x86/entry/common.c:301 [<00000000e706c40e>] 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