From: Thorsten Blum <thorsten.blum@linux.dev>
To: Steven Rostedt <rostedt@goodmis.org>,
Masami Hiramatsu <mhiramat@kernel.org>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Thorsten Blum <thorsten.blum@linux.dev>,
linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org
Subject: [PATCH] tracing/osnoise: Replace kmalloc() + copy_from_user() with memdup_user()
Date: Fri, 5 Sep 2025 21:21:17 +0200 [thread overview]
Message-ID: <20250905192116.554018-2-thorsten.blum@linux.dev> (raw)
Replace kmalloc() followed by copy_from_user() with memdup_user() to
improve and simplify osnoise_cpus_write().
No functional changes intended.
Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
---
kernel/trace/trace_osnoise.c | 9 +++------
1 file changed, 3 insertions(+), 6 deletions(-)
diff --git a/kernel/trace/trace_osnoise.c b/kernel/trace/trace_osnoise.c
index fd259da0aa64..dd97f6bd03a4 100644
--- a/kernel/trace/trace_osnoise.c
+++ b/kernel/trace/trace_osnoise.c
@@ -2322,12 +2322,9 @@ osnoise_cpus_write(struct file *filp, const char __user *ubuf, size_t count,
int running, err;
char *buf __free(kfree) = NULL;
- buf = kmalloc(count, GFP_KERNEL);
- if (!buf)
- return -ENOMEM;
-
- if (copy_from_user(buf, ubuf, count))
- return -EFAULT;
+ buf = memdup_user(ubuf, count);
+ if (IS_ERR(buf))
+ return PTR_ERR(buf);
if (!zalloc_cpumask_var(&osnoise_cpumask_new, GFP_KERNEL))
return -ENOMEM;
--
2.51.0
reply other threads:[~2025-09-05 19:21 UTC|newest]
Thread overview: [no followups] expand[flat|nested] mbox.gz Atom feed
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20250905192116.554018-2-thorsten.blum@linux.dev \
--to=thorsten.blum@linux.dev \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-trace-kernel@vger.kernel.org \
--cc=mathieu.desnoyers@efficios.com \
--cc=mhiramat@kernel.org \
--cc=rostedt@goodmis.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.