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nios2: copy_from_user() should zero the tail of destination

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Cc: [email protected]
Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
Al Viro committed 2016-09-13 17:49:43 -04:00
1 parent ae7cc577ec
commit e33d1f6f72
1 file changed
+6 -3
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arch/nios2/include/asm/uaccess.h
+6 -3
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@@ -102,9 +102,12 @@ extern long __copy_to_user(void __user *to, const void *from, unsigned long n);
static inline long copy_from_user(void *to, const void __user *from,
unsigned long n)
{
if (!access_ok(VERIFY_READ, from, n))
return n;
return __copy_from_user(to, from, n);
unsigned long res = n;
if (access_ok(VERIFY_READ, from, n))
res = __copy_from_user(to, from, n);
if (unlikely(res))
memset(to + (n - res), 0, res);
return res;
}
static inline long copy_to_user(void __user *to, const void *from,