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tracing/osnoise: Replace kmalloc + copy_from_user with memdup_user_nul

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Replace kmalloc() followed by copy_from_user() with memdup_user_nul() to
simplify and improve osnoise_cpus_write(). Remove the manual
NUL-termination.

No functional changes intended.

Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Link: https://lore.kernel.org/20251001130907.364673-2-thorsten.blum@linux.dev
Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Thorsten Blum 2025-10-01 15:09:07 +02:00 committed by Steven Rostedt (Google)
parent e5f0a698b3
commit f0c029d2ff
1 changed files with 4 additions and 7 deletions
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11
kernel/trace/trace_osnoise.c
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@ -24,6 +24,7 @@
#include <linux/sched/clock.h>
#include <uapi/linux/sched/types.h>
#include <linux/sched.h>
#include <linux/string.h>
#include "trace.h"
#ifdef CONFIG_X86_LOCAL_APIC
@ -2325,13 +2326,9 @@ osnoise_cpus_write(struct file *filp, const char __user *ubuf, size_t count,
if (count < 1)
return 0;
buf = kmalloc(count + 1, GFP_KERNEL);
if (!buf)
return -ENOMEM;
if (copy_from_user(buf, ubuf, count))
return -EFAULT;
buf[count] = '\0';
buf = memdup_user_nul(ubuf, count);
if (IS_ERR(buf))
return PTR_ERR(buf);
if (!zalloc_cpumask_var(&osnoise_cpumask_new, GFP_KERNEL))
return -ENOMEM;