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asm-generic: zero in __get_user(), not __get_user_fn() 

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2017-03-28 01:02:40 -04:00
parent 3fb5007528
commit c1aad8dcc4
1 changed files with 6 additions and 12 deletions
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18
include/asm-generic/uaccess.h
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@ -86,8 +86,7 @@ static inline int __access_ok(unsigned long addr, unsigned long size)
static inline int __put_user_fn(size_t size, void __user *ptr, void *x) static inline int __put_user_fn(size_t size, void __user *ptr, void *x)
{ {
size = __copy_to_user(ptr, x, size); return unlikely(__copy_to_user(ptr, x, size)) ? -EFAULT : 0;
return size ? -EFAULT : size;
} }
#define __put_user_fn(sz, u, k) __put_user_fn(sz, u, k) #define __put_user_fn(sz, u, k) __put_user_fn(sz, u, k)
@ -102,28 +101,28 @@ extern int __put_user_bad(void) __attribute__((noreturn));
__chk_user_ptr(ptr); \ __chk_user_ptr(ptr); \
switch (sizeof(*(ptr))) { \ switch (sizeof(*(ptr))) { \
case 1: { \ case 1: { \
unsigned char __x; \ unsigned char __x = 0; \
__gu_err = __get_user_fn(sizeof (*(ptr)), \ __gu_err = __get_user_fn(sizeof (*(ptr)), \
ptr, &__x); \ ptr, &__x); \
(x) = *(__force __typeof__(*(ptr)) *) &__x; \ (x) = *(__force __typeof__(*(ptr)) *) &__x; \
break; \ break; \
}; \ }; \
case 2: { \ case 2: { \
unsigned short __x; \ unsigned short __x = 0; \
__gu_err = __get_user_fn(sizeof (*(ptr)), \ __gu_err = __get_user_fn(sizeof (*(ptr)), \
ptr, &__x); \ ptr, &__x); \
(x) = *(__force __typeof__(*(ptr)) *) &__x; \ (x) = *(__force __typeof__(*(ptr)) *) &__x; \
break; \ break; \
}; \ }; \
case 4: { \ case 4: { \
unsigned int __x; \ unsigned int __x = 0; \
__gu_err = __get_user_fn(sizeof (*(ptr)), \ __gu_err = __get_user_fn(sizeof (*(ptr)), \
ptr, &__x); \ ptr, &__x); \
(x) = *(__force __typeof__(*(ptr)) *) &__x; \ (x) = *(__force __typeof__(*(ptr)) *) &__x; \
break; \ break; \
}; \ }; \
case 8: { \ case 8: { \
unsigned long long __x; \ unsigned long long __x = 0; \
__gu_err = __get_user_fn(sizeof (*(ptr)), \ __gu_err = __get_user_fn(sizeof (*(ptr)), \
ptr, &__x); \ ptr, &__x); \
(x) = *(__force __typeof__(*(ptr)) *) &__x; \ (x) = *(__force __typeof__(*(ptr)) *) &__x; \
@ -148,12 +147,7 @@ extern int __put_user_bad(void) __attribute__((noreturn));
#ifndef __get_user_fn #ifndef __get_user_fn
static inline int __get_user_fn(size_t size, const void __user *ptr, void *x) static inline int __get_user_fn(size_t size, const void __user *ptr, void *x)
{ {
size_t n = __copy_from_user(x, ptr, size); return unlikely(__copy_from_user(x, ptr, size)) ? -EFAULT : 0;
if (unlikely(n)) {
memset(x + (size - n), 0, n);
return -EFAULT;
}
return 0;
} }
#define __get_user_fn(sz, u, k) __get_user_fn(sz, u, k) #define __get_user_fn(sz, u, k) __get_user_fn(sz, u, k)