Merge branch 'linus' into x86/asm, to pick up recent fixes

Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 7 insertions, 4 deletions

diff --git a/arch/microblaze/include/asm/uaccess.h b/arch/microblaze/include/asm/uaccess.h
index 331b0d35f89c..826676778094 100644
--- a/arch/microblaze/include/asm/uaccess.h
+++ b/arch/microblaze/include/asm/uaccess.h
@@ -227,7 +227,7 @@ extern long __user_bad(void);
 
 #define __get_user(x, ptr)                                              \
 ({                                                                      \
-        unsigned long __gu_val;                                         \
+        unsigned long __gu_val = 0;                                     \
         /*unsigned long __gu_ptr = (unsigned long)(ptr);*/              \
         long __gu_err;                                                  \
         switch (sizeof(*(ptr))) {                                       \
@@ -373,10 +373,13 @@ extern long __user_bad(void);
 static inline long copy_from_user(void *to,
                 const void __user *from, unsigned long n)
 {
+        unsigned long res = n;
         might_fault();
-        if (access_ok(VERIFY_READ, from, n))
-                return __copy_from_user(to, from, n);
-        return n;
+        if (likely(access_ok(VERIFY_READ, from, n)))
+                res = __copy_from_user(to, from, n);
+        if (unlikely(res))
+                memset(to + (n - res), 0, res);
+        return res;
 }
 
 #define __copy_to_user(to, from, n)     \