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| author | Arnd Bergmann <arnd@arndb.de> | 2022-02-15 15:37:37 +0100 |
|---|---|---|
| committer | Arnd Bergmann <arnd@arndb.de> | 2022-02-25 09:36:00 +0100 |
| commit | a97b693c3712f040c5802f32b2d685352e08cefa (patch) | |
| tree | fc414766f8e02eab031b3e5e18590fe36f9f0888 /arch/microblaze | |
| parent | 222ca305c9fd39e5ed8104da25c09b2b79a516a8 (diff) | |
| download | linux-a97b693c3712f040c5802f32b2d685352e08cefa.tar.gz | |
uaccess: fix nios2 and microblaze get_user_8()
These two architectures implement 8-byte get_user() through
a memcpy() into a four-byte variable, which won't fit.
Use a temporary 64-bit variable instead here, and use a double
cast the way that risc-v and openrisc do to avoid compile-time
warnings.
Fixes: 6a090e97972d ("arch/microblaze: support get_user() of size 8 bytes")
Fixes: 5ccc6af5e88e ("nios2: Memory management")
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Dinh Nguyen <dinguyen@kernel.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/microblaze')
| -rw-r--r-- | arch/microblaze/include/asm/uaccess.h | 18 |
1 files changed, 9 insertions, 9 deletions
diff --git a/arch/microblaze/include/asm/uaccess.h b/arch/microblaze/include/asm/uaccess.h index 5b6e0e7788f44..3fe96979d2c62 100644 --- a/arch/microblaze/include/asm/uaccess.h +++ b/arch/microblaze/include/asm/uaccess.h @@ -130,27 +130,27 @@ extern long __user_bad(void); #define __get_user(x, ptr) \ ({ \ - unsigned long __gu_val = 0; \ long __gu_err; \ switch (sizeof(*(ptr))) { \ case 1: \ - __get_user_asm("lbu", (ptr), __gu_val, __gu_err); \ + __get_user_asm("lbu", (ptr), x, __gu_err); \ break; \ case 2: \ - __get_user_asm("lhu", (ptr), __gu_val, __gu_err); \ + __get_user_asm("lhu", (ptr), x, __gu_err); \ break; \ case 4: \ - __get_user_asm("lw", (ptr), __gu_val, __gu_err); \ + __get_user_asm("lw", (ptr), x, __gu_err); \ break; \ - case 8: \ - __gu_err = __copy_from_user(&__gu_val, ptr, 8); \ - if (__gu_err) \ - __gu_err = -EFAULT; \ + case 8: { \ + __u64 __x = 0; \ + __gu_err = raw_copy_from_user(&__x, ptr, 8) ? \ + -EFAULT : 0; \ + (x) = (typeof(x))(typeof((x) - (x)))__x; \ break; \ + } \ default: \ /* __gu_val = 0; __gu_err = -EINVAL;*/ __gu_err = __user_bad();\ } \ - x = (__force __typeof__(*(ptr))) __gu_val; \ __gu_err; \ }) |