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ia64: copy_from_user() should zero the destination on access_ok() failure

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[ Upstream commit a5e541f796f17228793694d64b507f5f57db4cd7 ]

Cc: stable@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
This commit is contained in:
Al Viro
2016-08-18 21:31:41 -04:00
committed by Sasha Levin
parent 4661786b4e
commit 5b6def31a0
1 changed files with 9 additions and 11 deletions
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20
arch/ia64/include/asm/uaccess.h
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@ -263,17 +263,15 @@ __copy_from_user (void *to, const void __user *from, unsigned long count)
__cu_len; \
})
#define copy_from_user(to, from, n) \
({ \
void *__cu_to = (to); \
const void __user *__cu_from = (from); \
long __cu_len = (n); \
\
__chk_user_ptr(__cu_from); \
if (__access_ok(__cu_from, __cu_len, get_fs())) \
__cu_len = __copy_user((__force void __user *) __cu_to, __cu_from, __cu_len); \
__cu_len; \
})
static inline unsigned long
copy_from_user(void *to, const void __user *from, unsigned long n)
{
if (likely(__access_ok(from, n, get_fs())))
n = __copy_user((__force void __user *) to, from, n);
else
memset(to, 0, n);
return n;
}
#define __copy_in_user(to, from, size) __copy_user((to), (from), (size))