diff options
| author | Qiang.zhang <qiang.zhang@windriver.com> | 2021-09-09 14:58:22 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2021-09-09 15:57:04 +0300 |
| commit | 66e70be722886e4f134350212baa13f217e39e42 (patch) | |
| tree | 2054aa857c755e29d505a660c7d89241bc651044 | |
| parent | 3b33e3f4a6c0296812a7ee757bdae83290e64aed (diff) | |
| download | linux-66e70be722886e4f134350212baa13f217e39e42.tar.xz | |
io-wq: fix memory leak in create_io_worker()
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>
| -rw-r--r-- | fs/io-wq.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/io-wq.c b/fs/io-wq.c index c2e73ce6888a..6c55362c1f99 100644 --- a/fs/io-wq.c +++ b/fs/io-wq.c @@ -709,6 +709,7 @@ static void create_worker_cont(struct callback_head *cb) } raw_spin_unlock(&wqe->lock); io_worker_ref_put(wqe->wq); + kfree(worker); return; } @@ -725,6 +726,7 @@ static void io_workqueue_create(struct work_struct *work) if (!io_queue_worker_create(worker, acct, create_worker_cont)) { clear_bit_unlock(0, &worker->create_state); io_worker_release(worker); + kfree(worker); } } @@ -759,6 +761,7 @@ fail: if (!IS_ERR(tsk)) { io_init_new_worker(wqe, worker, tsk); } else if (!io_should_retry_thread(PTR_ERR(tsk))) { + kfree(worker); goto fail; } else { INIT_WORK(&worker->work, io_workqueue_create); |