io_uring: Fix return value from alloc_fixed_file_ref_node

alloc_fixed_file_ref_node() currently returns an ERR_PTR on failure.
io_sqe_files_unregister() expects it to return NULL and since it can only
return -ENOMEM, it makes more sense to change alloc_fixed_file_ref_node()
to behave that way.

Fixes: 1ffc54220c44 ("io_uring: fix io_sqe_files_unregister() hangs")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/fs/io_uring.c b/fs/io_uring.c
index dc92ca5..27a8c22 100644 (file)
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -7696,12 +7696,12 @@ static struct fixed_file_ref_node *alloc_fixed_file_ref_node(
 
        ref_node = kzalloc(sizeof(*ref_node), GFP_KERNEL);
        if (!ref_node)
-               return ERR_PTR(-ENOMEM);
+               return NULL;
 
        if (percpu_ref_init(&ref_node->refs, io_file_data_ref_zero,
                            0, GFP_KERNEL)) {
                kfree(ref_node);
-               return ERR_PTR(-ENOMEM);
+               return NULL;
        }
        INIT_LIST_HEAD(&ref_node->node);
        INIT_LIST_HEAD(&ref_node->file_list);
@@ -7795,9 +7795,9 @@ static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg,
        }
 
        ref_node = alloc_fixed_file_ref_node(ctx);
-       if (IS_ERR(ref_node)) {
+       if (!ref_node) {
                io_sqe_files_unregister(ctx);
-               return PTR_ERR(ref_node);
+               return -ENOMEM;
        }
 
        io_sqe_files_set_node(file_data, ref_node);
@@ -7897,8 +7897,8 @@ static int __io_sqe_files_update(struct io_ring_ctx *ctx,
                return -EINVAL;
 
        ref_node = alloc_fixed_file_ref_node(ctx);
-       if (IS_ERR(ref_node))
-               return PTR_ERR(ref_node);
+       if (!ref_node)
+               return -ENOMEM;
 
        done = 0;
        fds = u64_to_user_ptr(up->fds);