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Message-ID: <20250930170302.542931839@kernel.org> Date: Tue, 30 Sep 2025 13:01:43 -0400 From: Steven Rostedt <rostedt@...nel.org> To: linux-kernel@...r.kernel.org Cc: Masami Hiramatsu <mhiramat@...nel.org>, Mark Rutland <mark.rutland@....com>, Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, Andrew Morton <akpm@...ux-foundation.org>, Thorsten Blum <thorsten.blum@...ux.dev> Subject: [for-next][PATCH 08/11] tracing/osnoise: Replace kmalloc() + copy_from_user() with memdup_user() From: Thorsten Blum <thorsten.blum@...ux.dev> Replace kmalloc() followed by copy_from_user() with memdup_user() to improve and simplify osnoise_cpus_write(). No functional changes intended. Cc: Masami Hiramatsu <mhiramat@...nel.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@...icios.com> Link: https://lore.kernel.org/20250905192116.554018-2-thorsten.blum@linux.dev Signed-off-by: Thorsten Blum <thorsten.blum@...ux.dev> Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org> --- 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 4cb464894faf..f8aa9556c695 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; -- 2.50.1
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