fs:ext4:write: Initialize cache aligned filename buffer

The filename buffer is allocated dynamically. It must be cache aligned.
Moreover, it is necessary to erase its content before we use it for
file name operations.

This prevents from corruption of written file names.

Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>

fs/ext4/ext4fs.c

@@ -1011,8 +1011,6 @@ int ext4fs_write(const char *fname, unsigned char *buffer,
 	unsigned int blks_reqd_for_file;
 	unsigned int blocks_remaining;
 	int existing_file_inodeno;
-	char filename[256];
-
 	char *temp_ptr = NULL;
 	long int itable_blkno;
 	long int parent_itable_blkno;
@@ -1021,6 +1019,9 @@ int ext4fs_write(const char *fname, unsigned char *buffer,
 	unsigned int inodes_per_block;
 	unsigned int ibmap_idx;
 	struct ext_filesystem *fs = get_fs();
+	ALLOC_CACHE_ALIGN_BUFFER(char, filename, 256);
+	memset(filename, 0x00, sizeof(filename));
+
 	g_parent_inode = zalloc(sizeof(struct ext2_inode));
 	if (!g_parent_inode)
 		goto fail;