linux-kernel - [syzbot] memory leak in binder

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Message-ID: <000000000000aa181605ededf1fa@google.com>
Date:   Sun, 20 Nov 2022 13:51:41 -0800
From:   syzbot <syzbot+7f10c1653e35933c0f1e@...kaller.appspotmail.com>
To:     arve@...roid.com, brauner@...nel.org, cmllamas@...gle.com,
        gregkh@...uxfoundation.org, joel@...lfernandes.org,
        linux-kernel@...r.kernel.org, maco@...roid.com, surenb@...gle.com,
        syzkaller-bugs@...glegroups.com, tkjos@...roid.com
Subject: [syzbot] memory leak in binder_transaction (2)

Hello,

syzbot found the following issue on:

HEAD commit:    59d0d52c30d4 AMerge tag 'netfs-fixes-20221115' of git://gi..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=14a7b445880000
kernel config:  https://syzkaller.appspot.com/x/.config?x=435fb8cdd395f932
dashboard link: https://syzkaller.appspot.com/bug?extid=7f10c1653e35933c0f1e
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=114a3b35880000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/854c98a663e0/disk-59d0d52c.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/233c8e05ab54/vmlinux-59d0d52c.xz
kernel image: https://storage.googleapis.com/syzbot-assets/7254f9286f1d/bzImage-59d0d52c.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+7f10c1653e35933c0f1e@...kaller.appspotmail.com

BUG: memory leak
unreferenced object 0xffff88811b0bbe00 (size 32):
  comm "syz-executor.1", pid 4041, jiffies 4294986632 (age 15.340s)
  hex dump (first 32 bytes):
    00 be 0b 1b 81 88 ff ff 00 be 0b 1b 81 88 ff ff  ................
    03 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffff814ed530>] kmalloc_trace+0x20/0x90 mm/slab_common.c:1045
    [<ffffffff8396b973>] kmalloc include/linux/slab.h:553 [inline]
    [<ffffffff8396b973>] kzalloc include/linux/slab.h:689 [inline]
    [<ffffffff8396b973>] binder_transaction+0xc53/0x3f20 drivers/android/binder.c:3128
    [<ffffffff8396f213>] binder_thread_write+0x5d3/0x1790 drivers/android/binder.c:3975
    [<ffffffff839726cb>] binder_ioctl_write_read drivers/android/binder.c:5034 [inline]
    [<ffffffff839726cb>] binder_ioctl+0x22fb/0x3a30 drivers/android/binder.c:5321
    [<ffffffff8161f20c>] vfs_ioctl fs/ioctl.c:51 [inline]
    [<ffffffff8161f20c>] __do_sys_ioctl fs/ioctl.c:870 [inline]
    [<ffffffff8161f20c>] __se_sys_ioctl fs/ioctl.c:856 [inline]
    [<ffffffff8161f20c>] __x64_sys_ioctl+0xfc/0x140 fs/ioctl.c:856
    [<ffffffff848802d5>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
    [<ffffffff848802d5>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
    [<ffffffff84a00087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd



---
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