Messages in this thread | | | Date | Wed, 29 Jun 2022 23:09:22 -0700 | Subject | Re: [syzbot] memory leak in pty_common_install | From | syzbot <> |
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syzbot has found a reproducer for the following issue on:
HEAD commit: d9b2ba67917c Merge tag 'platform-drivers-x86-v5.19-3' of g.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1795f0f0080000 kernel config: https://syzkaller.appspot.com/x/.config?x=b6c1840347c4c391 dashboard link: https://syzkaller.appspot.com/bug?extid=bdebcbf44250d75bdd82 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13d01f90080000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=126f34f0080000
IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+bdebcbf44250d75bdd82@syzkaller.appspotmail.com
Warning: Permanently added '10.128.1.122' (ECDSA) to the list of known hosts. executing program executing program executing program BUG: memory leak unreferenced object 0xffff88810222e600 (size 512): comm "syz-executor149", pid 3615, jiffies 4294954919 (age 12.620s) hex dump (first 32 bytes): 50 e6 22 02 81 88 ff ff e0 ff ff ff 0f 00 00 00 P."............. 10 e6 22 02 81 88 ff ff 10 e6 22 02 81 88 ff ff .."......."..... backtrace: [<ffffffff8262ce09>] kmalloc include/linux/slab.h:600 [inline] [<ffffffff8262ce09>] pty_common_install+0x59/0x3d0 drivers/tty/pty.c:381 [<ffffffff8261decb>] tty_driver_install_tty drivers/tty/tty_io.c:1307 [inline] [<ffffffff8261decb>] tty_init_dev.part.0+0x5b/0x2f0 drivers/tty/tty_io.c:1419 [<ffffffff8261e1a0>] tty_init_dev+0x40/0x60 drivers/tty/tty_io.c:1409 [<ffffffff8262cc29>] ptmx_open drivers/tty/pty.c:834 [inline] [<ffffffff8262cc29>] ptmx_open+0xd9/0x210 drivers/tty/pty.c:800 [<ffffffff815dd68d>] chrdev_open+0x10d/0x340 fs/char_dev.c:414 [<ffffffff815cbf96>] do_dentry_open+0x1e6/0x660 fs/open.c:848 [<ffffffff815f26c1>] do_open fs/namei.c:3520 [inline] [<ffffffff815f26c1>] path_openat+0x18a1/0x1e70 fs/namei.c:3653 [<ffffffff815f5391>] do_filp_open+0xc1/0x1b0 fs/namei.c:3680 [<ffffffff815cf88d>] do_sys_openat2+0xed/0x260 fs/open.c:1278 [<ffffffff815d02df>] do_sys_open fs/open.c:1294 [inline] [<ffffffff815d02df>] __do_sys_openat fs/open.c:1310 [inline] [<ffffffff815d02df>] __se_sys_openat fs/open.c:1305 [inline] [<ffffffff815d02df>] __x64_sys_openat+0x7f/0xe0 fs/open.c:1305 [<ffffffff845ac915>] do_syscall_x64 arch/x86/entry/common.c:50 [inline] [<ffffffff845ac915>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 [<ffffffff8460006a>] entry_SYSCALL_64_after_hwframe+0x46/0xb0
BUG: memory leak unreferenced object 0xffff88810213d400 (size 1024): comm "syz-executor149", pid 3615, jiffies 4294954919 (age 12.620s) hex dump (first 32 bytes): 01 54 00 00 01 00 00 00 00 00 00 00 00 00 00 00 .T.............. 40 be ca 41 81 88 ff ff 60 65 c5 84 ff ff ff ff @..A....`e...... backtrace: [<ffffffff8261dbbc>] kmalloc include/linux/slab.h:600 [inline] [<ffffffff8261dbbc>] kzalloc include/linux/slab.h:733 [inline] [<ffffffff8261dbbc>] alloc_tty_struct+0x3c/0x2f0 drivers/tty/tty_io.c:3091 [<ffffffff8262ce72>] pty_common_install+0xc2/0x3d0 drivers/tty/pty.c:389 [<ffffffff8261decb>] tty_driver_install_tty drivers/tty/tty_io.c:1307 [inline] [<ffffffff8261decb>] tty_init_dev.part.0+0x5b/0x2f0 drivers/tty/tty_io.c:1419 [<ffffffff8261e1a0>] tty_init_dev+0x40/0x60 drivers/tty/tty_io.c:1409 [<ffffffff8262cc29>] ptmx_open drivers/tty/pty.c:834 [inline] [<ffffffff8262cc29>] ptmx_open+0xd9/0x210 drivers/tty/pty.c:800 [<ffffffff815dd68d>] chrdev_open+0x10d/0x340 fs/char_dev.c:414 [<ffffffff815cbf96>] do_dentry_open+0x1e6/0x660 fs/open.c:848 [<ffffffff815f26c1>] do_open fs/namei.c:3520 [inline] [<ffffffff815f26c1>] path_openat+0x18a1/0x1e70 fs/namei.c:3653 [<ffffffff815f5391>] do_filp_open+0xc1/0x1b0 fs/namei.c:3680 [<ffffffff815cf88d>] do_sys_openat2+0xed/0x260 fs/open.c:1278 [<ffffffff815d02df>] do_sys_open fs/open.c:1294 [inline] [<ffffffff815d02df>] __do_sys_openat fs/open.c:1310 [inline] [<ffffffff815d02df>] __se_sys_openat fs/open.c:1305 [inline] [<ffffffff815d02df>] __x64_sys_openat+0x7f/0xe0 fs/open.c:1305 [<ffffffff845ac915>] do_syscall_x64 arch/x86/entry/common.c:50 [inline] [<ffffffff845ac915>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 [<ffffffff8460006a>] entry_SYSCALL_64_after_hwframe+0x46/0xb0
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