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s390: get_user() should zero on failure

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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 2016-08-21 22:00:54 -04:00
parent 224264657b
commit fd2d2b191f
1 changed files with 4 additions and 4 deletions
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8
arch/s390/include/asm/uaccess.h
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@ -266,28 +266,28 @@ 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(&__x, ptr, \ __gu_err = __get_user_fn(&__x, ptr, \
sizeof(*(ptr))); \ sizeof(*(ptr))); \
(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(&__x, ptr, \ __gu_err = __get_user_fn(&__x, ptr, \
sizeof(*(ptr))); \ sizeof(*(ptr))); \
(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(&__x, ptr, \ __gu_err = __get_user_fn(&__x, ptr, \
sizeof(*(ptr))); \ sizeof(*(ptr))); \
(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(&__x, ptr, \ __gu_err = __get_user_fn(&__x, ptr, \
sizeof(*(ptr))); \ sizeof(*(ptr))); \
(x) = *(__force __typeof__(*(ptr)) *) &__x; \ (x) = *(__force __typeof__(*(ptr)) *) &__x; \