From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H . Peter Anvin" <hpa@zytor.com>,
x86@kernel.org, linux-kernel@vger.kernel.org
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Subject: [PATCH v1] x86/mtrr: Convert to use strncpy_from_user() helper
Date: Tue, 15 May 2018 21:05:35 +0300 [thread overview]
Message-ID: <20180515180535.89703-1-andriy.shevchenko@linux.intel.com> (raw)
Replace the open coded string fetch from the user.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
arch/x86/kernel/cpu/mtrr/if.c | 12 ++----------
1 file changed, 2 insertions(+), 10 deletions(-)
diff --git a/arch/x86/kernel/cpu/mtrr/if.c b/arch/x86/kernel/cpu/mtrr/if.c
index e4adad68b5e5..3cbae60663fa 100644
--- a/arch/x86/kernel/cpu/mtrr/if.c
+++ b/arch/x86/kernel/cpu/mtrr/if.c
@@ -105,17 +105,9 @@ mtrr_write(struct file *file, const char __user *buf, size_t len, loff_t * ppos)
memset(line, 0, LINE_SIZE);
- length = len;
- length--;
-
- if (length > LINE_SIZE - 1)
- length = LINE_SIZE - 1;
-
+ length = strncpy_from_user(line, buf, LINE_SIZE - 1);
if (length < 0)
- return -EINVAL;
-
- if (copy_from_user(line, buf, length))
- return -EFAULT;
+ return length;
strim(line);
--
2.17.0
next reply other threads:[~2018-05-15 18:07 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-15 18:05 Andy Shevchenko [this message]
2018-05-16 10:34 ` [tip:x86/mm] " tip-bot for Andy Shevchenko
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