linux-kernel - [PATCH 1/4] io_uring: move io_uring_rsrc

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Date:   Tue, 12 Apr 2022 09:30:39 -0700
From:   Dylan Yudaken <dylany@...com>
To:     <io-uring@...r.kernel.org>
CC:     <axboe@...nel.dk>, <asml.silence@...il.com>,
        <linux-kernel@...r.kernel.org>, <kernel-team@...com>,
        Dylan Yudaken <dylany@...com>
Subject: [PATCH 1/4] io_uring: move io_uring_rsrc_update2 validation

Move validation to be more consistently straight after
copy_from_user. This is already done in io_register_rsrc_update and so
this removes that redundant check.

Signed-off-by: Dylan Yudaken <dylany@...com>
---
 fs/io_uring.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 8a931eb8a3a6..58bfa71fe3b6 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -11398,8 +11398,6 @@ static int __io_register_rsrc_update(struct io_ring_ctx *ctx, unsigned type,
 	__u32 tmp;
 	int err;
 
-	if (up->resv)
-		return -EINVAL;
 	if (check_add_overflow(up->offset, nr_args, &tmp))
 		return -EOVERFLOW;
 	err = io_rsrc_node_switch_start(ctx);
@@ -11425,6 +11423,8 @@ static int io_register_files_update(struct io_ring_ctx *ctx, void __user *arg,
 	memset(&up, 0, sizeof(up));
 	if (copy_from_user(&up, arg, sizeof(struct io_uring_rsrc_update)))
 		return -EFAULT;
+	if (up.resv)
+		return -EINVAL;
 	return __io_register_rsrc_update(ctx, IORING_RSRC_FILE, &up, nr_args);
 }
 
-- 
2.30.2