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| author | Al Viro <viro@zeniv.linux.org.uk> | 2017-03-28 07:02:40 +0200 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2017-03-28 22:43:45 +0200 |
| commit | c1aad8dcc49382399f48541dc47b6e30b0ef1b62 (patch) | |
| tree | 1ebef059a1bc6503c19758c31d43563b1aea3846 /include/asm-generic | |
| parent | asm-generic/uaccess.h: don't mess with __copy_{to,from}_user (diff) | |
| download | linux-c1aad8dcc49382399f48541dc47b6e30b0ef1b62.tar.xz linux-c1aad8dcc49382399f48541dc47b6e30b0ef1b62.zip | |
asm-generic: zero in __get_user(), not __get_user_fn()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'include/asm-generic')
| -rw-r--r-- | include/asm-generic/uaccess.h | 18 |
1 files changed, 6 insertions, 12 deletions
diff --git a/include/asm-generic/uaccess.h b/include/asm-generic/uaccess.h index b048246a606b..bd7a05e9582b 100644 --- a/include/asm-generic/uaccess.h +++ b/include/asm-generic/uaccess.h @@ -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) { - size = __copy_to_user(ptr, x, size); - return size ? -EFAULT : size; + return unlikely(__copy_to_user(ptr, x, size)) ? -EFAULT : 0; } #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); \ switch (sizeof(*(ptr))) { \ case 1: { \ - unsigned char __x; \ + unsigned char __x = 0; \ __gu_err = __get_user_fn(sizeof (*(ptr)), \ ptr, &__x); \ (x) = *(__force __typeof__(*(ptr)) *) &__x; \ break; \ }; \ case 2: { \ - unsigned short __x; \ + unsigned short __x = 0; \ __gu_err = __get_user_fn(sizeof (*(ptr)), \ ptr, &__x); \ (x) = *(__force __typeof__(*(ptr)) *) &__x; \ break; \ }; \ case 4: { \ - unsigned int __x; \ + unsigned int __x = 0; \ __gu_err = __get_user_fn(sizeof (*(ptr)), \ ptr, &__x); \ (x) = *(__force __typeof__(*(ptr)) *) &__x; \ break; \ }; \ case 8: { \ - unsigned long long __x; \ + unsigned long long __x = 0; \ __gu_err = __get_user_fn(sizeof (*(ptr)), \ ptr, &__x); \ (x) = *(__force __typeof__(*(ptr)) *) &__x; \ @@ -148,12 +147,7 @@ extern int __put_user_bad(void) __attribute__((noreturn)); #ifndef __get_user_fn static inline int __get_user_fn(size_t size, const void __user *ptr, void *x) { - size_t n = __copy_from_user(x, ptr, size); - if (unlikely(n)) { - memset(x + (size - n), 0, n); - return -EFAULT; - } - return 0; + return unlikely(__copy_from_user(x, ptr, size)) ? -EFAULT : 0; } #define __get_user_fn(sz, u, k) __get_user_fn(sz, u, k) |