Use seperated variable for realloc return value

Using the same variable for return value and input parameter
of realloc() may cause memory leak when realloc() fails
to allocate new memory.

Change-Id: If2ee2134b272e6fc158fc400dc352704d81b0e24
Signed-off-by: Semun Lee <semun.lee@samsung.com>

diff --git a/preference/preference.c b/preference/preference.c
index 6e78b4e..246f011 100755 (executable)
--- a/preference/preference.c
+++ b/preference/preference.c
@@ -830,6 +830,7 @@ static int _preference_get_key_filesys(keynode_t *keynode, int* io_errno)
        double value_dbl = 0;
        char file_buf[BUF_LEN] = {0,};
        char *value = NULL;
+       char *tmp_value;
        int value_size = 0;
 
 retry_open:
@@ -948,11 +949,14 @@ retry:
                while (fgets(file_buf, sizeof(file_buf), fp)) {
                        if (value) {
                                value_size = value_size + strlen(file_buf);
-                               value = (char *) realloc(value, value_size);
-                               if (value == NULL) {
+                               tmp_value = (char *) realloc(value, value_size);
+                               if (tmp_value == NULL) {
                                        func_ret = PREFERENCE_ERROR_OUT_OF_MEMORY;
+                                       free(value);
+                                       value = NULL;
                                        break;
                                }
+                               value = tmp_value;
                                strncat(value, file_buf, strlen(file_buf));
                        } else {
                                value_size = strlen(file_buf) + 1;