Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/lib/strncpy_from_user.c b/lib/strncpy_from_user.c
index b53e1b5..dccb95a 100644
--- a/lib/strncpy_from_user.c
+++ b/lib/strncpy_from_user.c
@@ -6,6 +6,7 @@
#include <linux/uaccess.h>
#include <linux/kernel.h>
#include <linux/errno.h>
+#include <linux/mm.h>
#include <asm/byteorder.h>
#include <asm/word-at-a-time.h>
@@ -23,10 +24,11 @@
* hit it), 'max' is the address space maximum (and we return
* -EFAULT if we hit it).
*/
-static inline long do_strncpy_from_user(char *dst, const char __user *src, long count, unsigned long max)
+static inline long do_strncpy_from_user(char *dst, const char __user *src,
+ unsigned long count, unsigned long max)
{
const struct word_at_a_time constants = WORD_AT_A_TIME_CONSTANTS;
- long res = 0;
+ unsigned long res = 0;
/*
* Truncate 'max' to the user-specified limit, so that
@@ -107,17 +109,18 @@
return 0;
max_addr = user_addr_max();
- src_addr = (unsigned long)src;
+ src_addr = (unsigned long)untagged_addr(src);
if (likely(src_addr < max_addr)) {
unsigned long max = max_addr - src_addr;
long retval;
kasan_check_write(dst, count);
check_object_size(dst, count, false);
- user_access_begin();
- retval = do_strncpy_from_user(dst, src, count, max);
- user_access_end();
- return retval;
+ if (user_access_begin(src, max)) {
+ retval = do_strncpy_from_user(dst, src, count, max);
+ user_access_end();
+ return retval;
+ }
}
return -EFAULT;
}