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metag: copy_from_user() should zero the destination on access_ok() failure

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Cc: stable@vger.kernel.org
Acked-by: James Hogan <james.hogan@imgtec.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2016-08-18 22:08:20 -04:00
parent a5e541f796
commit 8ae95ed4ae
1 changed files with 2 additions and 1 deletions
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3
arch/metag/include/asm/uaccess.h
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@ -204,8 +204,9 @@ extern unsigned long __must_check __copy_user_zeroing(void *to,
static inline unsigned long
copy_from_user(void *to, const void __user *from, unsigned long n)
{
if (access_ok(VERIFY_READ, from, n))
if (likely(access_ok(VERIFY_READ, from, n)))
return __copy_user_zeroing(to, from, n);
memset(to, 0, n);
return n;
}