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microblaze: fix copy_from_user()

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Cc: stable@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2016-09-09 19:22:34 -04:00
parent c90a3bc506
commit d0cf385160
1 changed files with 6 additions and 3 deletions
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9
arch/microblaze/include/asm/uaccess.h
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@ -373,10 +373,13 @@ extern long __user_bad(void);
static inline long copy_from_user(void *to, static inline long copy_from_user(void *to,
const void __user *from, unsigned long n) const void __user *from, unsigned long n)
{ {
unsigned long res = n;
might_fault(); might_fault();
if (access_ok(VERIFY_READ, from, n)) if (likely(access_ok(VERIFY_READ, from, n)))
return __copy_from_user(to, from, n); res = __copy_from_user(to, from, n);
return n; if (unlikely(res))
memset(to + (n - res), 0, res);
return res;
} }
#define __copy_to_user(to, from, n) \ #define __copy_to_user(to, from, n) \