Commit cad7af98 authored by Al Viro's avatar Al Viro Committed by Ben Hutchings

parisc: fix copy_from_user()

commit aace880f upstream.
Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
parent 71b9826d
......@@ -9,6 +9,8 @@
#include <asm/errno.h>
#include <asm-generic/uaccess-unaligned.h>
#include <linux/string.h>
#define VERIFY_READ 0
#define VERIFY_WRITE 1
......@@ -248,13 +250,14 @@ static inline unsigned long __must_check copy_from_user(void *to,
unsigned long n)
{
int sz = __compiletime_object_size(to);
int ret = -EFAULT;
unsigned long ret = n;
if (likely(sz == -1 || !__builtin_constant_p(n) || sz >= n))
ret = __copy_from_user(to, from, n);
else
copy_from_user_overflow();
if (unlikely(ret))
memset(to + (n - ret), 0, ret);
return ret;
}
......
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