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-rw-r--r--security/tomoyo/realpath.c32
1 files changed, 25 insertions, 7 deletions
diff --git a/security/tomoyo/realpath.c b/security/tomoyo/realpath.c
index 6c601bd300f3..738bbdf8d4c7 100644
--- a/security/tomoyo/realpath.c
+++ b/security/tomoyo/realpath.c
@@ -15,17 +15,19 @@
#include "../../fs/internal.h"
/**
- * tomoyo_encode: Convert binary string to ascii string.
+ * tomoyo_encode2 - Encode binary string to ascii string.
*
- * @str: String in binary format.
+ * @str: String in binary format.
+ * @str_len: Size of @str in byte.
*
* Returns pointer to @str in ascii format on success, NULL otherwise.
*
* This function uses kzalloc(), so caller must kfree() if this function
* didn't return NULL.
*/
-char *tomoyo_encode(const char *str)
+char *tomoyo_encode2(const char *str, int str_len)
{
+ int i;
int len = 0;
const char *p = str;
char *cp;
@@ -33,8 +35,9 @@ char *tomoyo_encode(const char *str)
if (!p)
return NULL;
- while (*p) {
- const unsigned char c = *p++;
+ for (i = 0; i < str_len; i++) {
+ const unsigned char c = p[i];
+
if (c == '\\')
len += 2;
else if (c > ' ' && c < 127)
@@ -49,8 +52,8 @@ char *tomoyo_encode(const char *str)
return NULL;
cp0 = cp;
p = str;
- while (*p) {
- const unsigned char c = *p++;
+ for (i = 0; i < str_len; i++) {
+ const unsigned char c = p[i];
if (c == '\\') {
*cp++ = '\\';
@@ -68,6 +71,21 @@ char *tomoyo_encode(const char *str)
}
/**
+ * tomoyo_encode - Encode binary string to ascii string.
+ *
+ * @str: String in binary format.
+ *
+ * Returns pointer to @str in ascii format on success, NULL otherwise.
+ *
+ * This function uses kzalloc(), so caller must kfree() if this function
+ * didn't return NULL.
+ */
+char *tomoyo_encode(const char *str)
+{
+ return str ? tomoyo_encode2(str, strlen(str)) : NULL;
+}
+
+/**
* tomoyo_get_absolute_path - Get the path of a dentry but ignores chroot'ed root.
*
* @path: Pointer to "struct path".