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mm/thp: fix strncpy warning

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Using MAX_INPUT_BUF_SZ as the maximum length of the string makes fortify
complain as it thinks the string might be longer than the buffer, and if
it is, we will end up with a "string" that is missing a NUL terminator.
It's trivial to show that 'tok' points to a NUL-terminated string which is
less than MAX_INPUT_BUF_SZ in length, so we may as well just use strcpy()
and avoid the warning.

Link: https://lkml.kernel.org/r/20210615200242.1716568-4-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2021-06-30 18:52:11 -07:00 committed by Linus Torvalds
parent 36af67370e
commit 1212e00c93
1 changed files with 1 additions and 1 deletions
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mm/huge_memory.c
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@ -3101,7 +3101,7 @@ static ssize_t split_huge_pages_write(struct file *file, const char __user *buf,
tok = strsep(&buf, ",");
if (tok) {
strncpy(file_path, tok, MAX_INPUT_BUF_SZ);
strcpy(file_path, tok);
} else {
ret = -EINVAL;
goto out;