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x86/mtrr: Convert to use strncpy_from_user() helper 

Replace the open coded string fetch from user-space with strncpy_from_user().

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Luis R. Rodriguez <mcgrof@suse.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Toshi Kani <toshi.kani@hp.com>
Link: http://lkml.kernel.org/r/20180515180535.89703-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Andy Shevchenko 2018-05-15 21:05:35 +03:00 committed by Ingo Molnar
parent 13a4db9d75
commit 7f8ec5a4f0
1 changed files with 2 additions and 10 deletions
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12
arch/x86/kernel/cpu/mtrr/if.c
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@ -106,17 +106,9 @@ 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;
linelen = strlen(line);
ptr = line + linelen - 1;