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io_uring: Fix return value from alloc_fixed_file_ref_node

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[ Upstream commit 3e2224c5867fead6c0b94b84727cc676ac6353a3 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2021-01-06 16:09:26 +00:00 committed by Greg Kroah-Hartman
parent 51495b7195
commit 458b40598d
1 changed files with 6 additions and 6 deletions
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12
fs/io_uring.c
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@ -7461,12 +7461,12 @@ 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);
@ -7560,9 +7560,9 @@ 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);
@ -7662,8 +7662,8 @@ 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);