arm64: dts: rk3368-sheep: fix sheep backlight

[firefly-linux-kernel-4.4.55.git] / lib / strncpy_from_user.c

diff --git a/lib/strncpy_from_user.c b/lib/strncpy_from_user.c
index 33840324138c21fc427c5c8dcbda66cb64ab3636..05efc1fa97f08941d763996d38ce08afbbaba459 100644 (file)
--- a/lib/strncpy_from_user.c
+++ b/lib/strncpy_from_user.c
@@ -1,5 +1,6 @@
 #include <linux/compiler.h>
 #include <linux/export.h>
+#include <linux/thread_info.h>
 #include <linux/uaccess.h>
 #include <linux/kernel.h>
 #include <linux/errno.h>
@@ -39,8 +40,8 @@ static inline long do_strncpy_from_user(char *dst, const char __user *src, long
                unsigned long c, data;
 
                /* Fall back to byte-at-a-time if we get a page fault */
-               if (unlikely(unsafe_get_user(c,(unsigned long __user *)(src+res))))
-                       break;
+               unsafe_get_user(c, (unsigned long __user *)(src+res), byte_at_a_time);
+
                *(unsigned long *)(dst+res) = c;
                if (has_zero(c, &data, &constants)) {
                        data = prep_zero_mask(c, data, &constants);
@@ -55,8 +56,7 @@ byte_at_a_time:
        while (max) {
                char c;
 
-               if (unlikely(unsafe_get_user(c,src+res)))
-                       return -EFAULT;
+               unsafe_get_user(c,src+res, efault);
                dst[res] = c;
                if (!c)
                        return res;
@@ -75,6 +75,7 @@ byte_at_a_time:
         * Nope: we hit the address space limit, and we still had more
         * characters the caller would have wanted. That's an EFAULT.
         */
+efault:
        return -EFAULT;
 }
 
@@ -109,6 +110,7 @@ long strncpy_from_user(char *dst, const char __user *src, long count)
                unsigned long max = max_addr - src_addr;
                long retval;
 
+               check_object_size(dst, count, false);
                user_access_begin();
                retval = do_strncpy_from_user(dst, src, count, max);
                user_access_end();