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| author | Matthew Wilcox (Oracle) <willy@infradead.org> | 2020-10-09 13:49:51 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2020-10-09 08:52:26 -0600 |
| commit | ce765372bc443573d1d339a2bf4995de385dea3a (patch) | |
| tree | ae4b4eb1580c14976b6eda468029edcd0919b2e2 /fs/io_uring.c | |
| parent | ed6930c9201cd1e00f74474da2f095796a0d82f6 (diff) | |
| download | lwn-ce765372bc443573d1d339a2bf4995de385dea3a.tar.gz lwn-ce765372bc443573d1d339a2bf4995de385dea3a.zip | |
io_uring: Fix use of XArray in __io_uring_files_cancel
We have to drop the lock during each iteration, so there's no advantage
to using the advanced API. Convert this to a standard xa_for_each() loop.
Reported-by: syzbot+27c12725d8ff0bfe1a13@syzkaller.appspotmail.com
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'fs/io_uring.c')
| -rw-r--r-- | fs/io_uring.c | 19 |
1 files changed, 5 insertions, 14 deletions
diff --git a/fs/io_uring.c b/fs/io_uring.c index 299c530c66f9..2978cc78538a 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -8665,28 +8665,19 @@ static void io_uring_attempt_task_drop(struct file *file, bool exiting) void __io_uring_files_cancel(struct files_struct *files) { struct io_uring_task *tctx = current->io_uring; - XA_STATE(xas, &tctx->xa, 0); + struct file *file; + unsigned long index; /* make sure overflow events are dropped */ tctx->in_idle = true; - do { - struct io_ring_ctx *ctx; - struct file *file; - - xas_lock(&xas); - file = xas_next_entry(&xas, ULONG_MAX); - xas_unlock(&xas); - - if (!file) - break; - - ctx = file->private_data; + xa_for_each(&tctx->xa, index, file) { + struct io_ring_ctx *ctx = file->private_data; io_uring_cancel_task_requests(ctx, files); if (files) io_uring_del_task_file(file); - } while (1); + } } static inline bool io_uring_task_idle(struct io_uring_task *tctx) |