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h8300: fix recent uaccess breakage 

Al Viro wrote:
>
> 	After that commit in asm-h8300/uaccess.h we have
>
> #define get_user(x, ptr)                                        \
> ({                                                              \
>     int __gu_err = 0;                                           \
>     uint32_t __gu_val = 0;                              \
>     ^^^^^^^^^^^^^^^^^
>     switch (sizeof(*(ptr))) {                                   \
>     case 1:                                                     \
>     case 2:                                                     \
>     case 4:                                                     \
>         __gu_val = *(ptr);                                      \
>         break;                                                  \
>     case 8:                                                     \
>         memcpy(&__gu_val, ptr, sizeof (*(ptr)));                \
>                                ^^^^^^^^^^^^^^^^
>
> which, of course, is FUBAR whenever we actually hit that case - memcpy of
> 8 bytes into uint32_t is obviously wrong.  Why don't we simply do

Cc: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Yoshinori Sato 2008-03-13 12:32:37 -07:00 committed by Linus Torvalds
parent fb39380b8d
commit 12d48739d0
1 changed files with 4 additions and 7 deletions
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11
include/asm-h8300/uaccess.h
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@ -91,22 +91,19 @@ extern int __put_user_bad(void);
#define get_user(x, ptr) \
({ \
int __gu_err = 0; \
uint32_t __gu_val = 0; \
typeof(*(ptr)) __gu_val = *ptr; \
switch (sizeof(*(ptr))) { \
case 1: \
case 2: \
case 4: \
__gu_val = *(ptr); \
break; \
case 8: \
memcpy(&__gu_val, ptr, sizeof (*(ptr))); \
case 8: \
break; \
default: \
__gu_val = 0; \
__gu_err = __get_user_bad(); \
__gu_val = 0; \
break; \
} \
(x) = (typeof(*(ptr)))__gu_val; \
(x) = __gu_val; \
__gu_err; \
})
#define __get_user(x, ptr) get_user(x, ptr)