diff --git a/fsck/main.c b/fsck/main.c
index 9b5078708b3f..b01b52cf546e 100644
--- a/fsck/main.c
+++ b/fsck/main.c
@@ -1051,7 +1051,7 @@ static int do_label(struct f2fs_sb_info *sbi)
 	if (!c.vol_label) {
 		char label[MAX_VOLUME_NAME];
 
-		utf16_to_utf8(label, sb->volume_name,
+		utf16_to_utf8(label, (const char *)sb->volume_name,
 			      MAX_VOLUME_NAME, MAX_VOLUME_NAME);
 		MSG(0, "Info: volume label = %s\n", label);
 		return 0;
@@ -1062,7 +1062,7 @@ static int do_label(struct f2fs_sb_info *sbi)
 		return -1;
 	}
 
-	utf8_to_utf16(sb->volume_name, (const char *)c.vol_label,
+	utf8_to_utf16((char *)sb->volume_name, (const char *)c.vol_label,
 		      MAX_VOLUME_NAME, strlen(c.vol_label));
 
 	update_superblock(sb, SB_MASK_ALL);
diff --git a/fsck/mount.c b/fsck/mount.c
index df0314d57caf..9209558bd946 100644
--- a/fsck/mount.c
+++ b/fsck/mount.c
@@ -365,7 +365,7 @@ void print_node_info(struct f2fs_sb_info *sbi,
 	}
 }
 
-static void DISP_label(uint16_t *name)
+static void DISP_label(const char *name)
 {
 	char buffer[MAX_VOLUME_NAME];
 
@@ -391,7 +391,7 @@ printout:
 	DISP_u32(sb, magic);
 	DISP_u32(sb, major_ver);
 
-	DISP_label(sb->volume_name);
+	DISP_label((const char *)sb->volume_name);
 
 	DISP_u32(sb, minor_ver);
 	DISP_u32(sb, log_sectorsize);
diff --git a/include/f2fs_fs.h b/include/f2fs_fs.h
index 694881402b90..832dee298e64 100644
--- a/include/f2fs_fs.h
+++ b/include/f2fs_fs.h
@@ -1430,8 +1430,8 @@ enum {
 	SSR
 };
 
-extern int utf8_to_utf16(uint16_t *, const char *, size_t, size_t);
-extern int utf16_to_utf8(char *, const uint16_t *, size_t, size_t);
+extern int utf8_to_utf16(char *, const char *, size_t, size_t);
+extern int utf16_to_utf8(char *, const char *, size_t, size_t);
 extern int log_base_2(uint32_t);
 extern unsigned int addrs_per_inode(struct f2fs_inode *);
 extern unsigned int addrs_per_block(struct f2fs_inode *);
diff --git a/lib/libf2fs.c b/lib/libf2fs.c
index 6b879f9d4165..aa7f15b4c526 100644
--- a/lib/libf2fs.c
+++ b/lib/libf2fs.c
@@ -115,31 +115,40 @@ static uint16_t *wchar_to_utf16(uint16_t *output, wchar_t wc, size_t outsize)
 	return output + 2;
 }
 
-int utf8_to_utf16(uint16_t *output, const char *input, size_t outsize,
+int utf8_to_utf16(char *output, const char *input, size_t outsize,
 		size_t insize)
 {
 	const char *inp = input;
-	uint16_t *outp = output;
+	uint16_t *outp;
 	wchar_t wc;
+	uint16_t *volume_name = calloc(sizeof(uint16_t), MAX_VOLUME_NAME);
+
+	if (!volume_name)
+		return -ENOMEM;
+
+	outp = volume_name;
 
 	while ((size_t)(inp - input) < insize && *inp) {
 		inp = utf8_to_wchar(inp, &wc, insize - (inp - input));
 		if (inp == NULL) {
 			DBG(0, "illegal UTF-8 sequence\n");
+			free(volume_name);
 			return -EILSEQ;
 		}
-		outp = wchar_to_utf16(outp, wc, outsize - (outp - output));
+		outp = wchar_to_utf16(outp, wc, outsize - (outp - volume_name));
 		if (outp == NULL) {
 			DBG(0, "name is too long\n");
+			free(volume_name);
 			return -ENAMETOOLONG;
 		}
 	}
 	*outp = cpu_to_le16(0);
+	memcpy(output, volume_name, sizeof(uint16_t) * MAX_VOLUME_NAME);
+	free(volume_name);
 	return 0;
 }
 
-static const uint16_t *utf16_to_wchar(const uint16_t *input, wchar_t *wc,
-		size_t insize)
+static uint16_t *utf16_to_wchar(uint16_t *input, wchar_t *wc, size_t insize)
 {
 	if ((le16_to_cpu(input[0]) & 0xfc00) == 0xd800) {
 		if (insize < 2 || (le16_to_cpu(input[1]) & 0xfc00) != 0xdc00)
@@ -201,26 +210,36 @@ static char *wchar_to_utf8(char *output, wchar_t wc, size_t outsize)
 	return output;
 }
 
-int utf16_to_utf8(char *output, const uint16_t *input, size_t outsize,
+int utf16_to_utf8(char *output, const char *input, size_t outsize,
 		size_t insize)
 {
-	const uint16_t *inp = input;
 	char *outp = output;
 	wchar_t wc;
+	uint16_t *inp;
+	uint16_t *volume_name = calloc(sizeof(uint16_t), MAX_VOLUME_NAME);
+
+	if (!volume_name)
+		return -ENOMEM;
+
+	memcpy(volume_name, input, sizeof(uint16_t) * MAX_VOLUME_NAME);
+	inp = volume_name;
 
-	while ((size_t)(inp - input) < insize && le16_to_cpu(*inp)) {
-		inp = utf16_to_wchar(inp, &wc, insize - (inp - input));
+	while ((size_t)(inp - volume_name) < insize && le16_to_cpu(*inp)) {
+		inp = utf16_to_wchar(inp, &wc, insize - (inp - volume_name));
 		if (inp == NULL) {
 			DBG(0, "illegal UTF-16 sequence\n");
+			free(volume_name);
 			return -EILSEQ;
 		}
 		outp = wchar_to_utf8(outp, wc, outsize - (outp - output));
 		if (outp == NULL) {
 			DBG(0, "name is too long\n");
+			free(volume_name);
 			return -ENAMETOOLONG;
 		}
 	}
 	*outp = '\0';
+	free(volume_name);
 	return 0;
 }
 
diff --git a/mkfs/f2fs_format.c b/mkfs/f2fs_format.c
index d3bb62222024..3e4905757161 100644
--- a/mkfs/f2fs_format.c
+++ b/mkfs/f2fs_format.c
@@ -512,7 +512,7 @@ static int f2fs_prepare_super_block(void)
 	if (c.feature & cpu_to_le32(F2FS_FEATURE_INODE_CHKSUM))
 		c.chksum_seed = f2fs_cal_crc32(~0, sb->uuid, sizeof(sb->uuid));
 
-	utf8_to_utf16(sb->volume_name, (const char *)c.vol_label,
+	utf8_to_utf16((char *)sb->volume_name, (const char *)c.vol_label,
 				MAX_VOLUME_NAME, strlen(c.vol_label));
 	set_sb(node_ino, 1);
 	set_sb(meta_ino, 2);
