* [PATCH] io_uring: Fix return value from alloc_fixed_file_ref_node
@ 2021-01-06 16:09 Matthew Wilcox (Oracle)
2021-01-06 16:20 ` Jens Axboe
0 siblings, 1 reply; 2+ messages in thread
From: Matthew Wilcox (Oracle) @ 2021-01-06 16:09 UTC (permalink / raw)
To: linux-fsdevel, io-uring, Pavel Begunkov, Jens Axboe,
Dan Carpenter
Cc: Matthew Wilcox (Oracle)
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 <[email protected]>
Signed-off-by: Matthew Wilcox (Oracle) <[email protected]>
---
fs/io_uring.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index ca46f314640b..d4d3e30331e4 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -7684,12 +7684,12 @@ 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);
@@ -7783,9 +7783,9 @@ 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);
@@ -7885,8 +7885,8 @@ 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);
--
2.29.2
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2021-01-06 16:09 [PATCH] io_uring: Fix return value from alloc_fixed_file_ref_node Matthew Wilcox (Oracle)
2021-01-06 16:20 ` Jens Axboe
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