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66e70be722
BUG: memory leak
unreferenced object 0xffff888126fcd6c0 (size 192):
comm "syz-executor.1", pid 11934, jiffies 4294983026 (age 15.690s)
backtrace:
[<ffffffff81632c91>] kmalloc_node include/linux/slab.h:609 [inline]
[<ffffffff81632c91>] kzalloc_node include/linux/slab.h:732 [inline]
[<ffffffff81632c91>] create_io_worker+0x41/0x1e0 fs/io-wq.c:739
[<ffffffff8163311e>] io_wqe_create_worker fs/io-wq.c:267 [inline]
[<ffffffff8163311e>] io_wqe_enqueue+0x1fe/0x330 fs/io-wq.c:866
[<ffffffff81620b64>] io_queue_async_work+0xc4/0x200 fs/io_uring.c:1473
[<ffffffff8162c59c>] __io_queue_sqe+0x34c/0x510 fs/io_uring.c:6933
[<ffffffff8162c7ab>] io_req_task_submit+0x4b/0xa0 fs/io_uring.c:2233
[<ffffffff8162cb48>] io_async_task_func+0x108/0x1c0 fs/io_uring.c:5462
[<ffffffff816259e3>] tctx_task_work+0x1b3/0x3a0 fs/io_uring.c:2158
[<ffffffff81269b43>] task_work_run+0x73/0xb0 kernel/task_work.c:164
[<ffffffff812dcdd1>] tracehook_notify_signal include/linux/tracehook.h:212 [inline]
[<ffffffff812dcdd1>] handle_signal_work kernel/entry/common.c:146 [inline]
[<ffffffff812dcdd1>] exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
[<ffffffff812dcdd1>] exit_to_user_mode_prepare+0x151/0x180 kernel/entry/common.c:209
[<ffffffff843ff25d>] __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
[<ffffffff843ff25d>] syscall_exit_to_user_mode+0x1d/0x40 kernel/entry/common.c:302
[<ffffffff843fa4a2>] do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
[<ffffffff84600068>] entry_SYSCALL_64_after_hwframe+0x44/0xae
when create_io_thread() return error, and not retry, the worker object
need to be freed.
Reported-by: syzbot+65454c239241d3d647da@syzkaller.appspotmail.com
Signed-off-by: Qiang.zhang <qiang.zhang@windriver.com>
Link: https://lore.kernel.org/r/20210909115822.181188-1-qiang.zhang@windriver.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.