From 7b0604d77a41192316347618cce1d9c795613adb Mon Sep 17 00:00:00 2001 From: Thorsten Blum Date: Fri, 5 Sep 2025 12:18:17 +0200 Subject: [PATCH] io_uring: Replace kzalloc() + copy_from_user() with memdup_user() Replace kzalloc() followed by copy_from_user() with memdup_user() to improve and simplify io_probe(). No functional changes intended. Signed-off-by: Thorsten Blum Signed-off-by: Jens Axboe --- io_uring/register.c | 10 +++------- 1 file changed, 3 insertions(+), 7 deletions(-) diff --git a/io_uring/register.c b/io_uring/register.c index 9c31a8afb83d2..f4c76db276836 100644 --- a/io_uring/register.c +++ b/io_uring/register.c @@ -47,13 +47,9 @@ static __cold int io_probe(struct io_ring_ctx *ctx, void __user *arg, nr_args = IORING_OP_LAST; size = struct_size(p, ops, nr_args); - p = kzalloc(size, GFP_KERNEL); - if (!p) - return -ENOMEM; - - ret = -EFAULT; - if (copy_from_user(p, arg, size)) - goto out; + p = memdup_user(arg, size); + if (IS_ERR(p)) + return PTR_ERR(p); ret = -EINVAL; if (memchr_inv(p, 0, size)) goto out; -- 2.47.3