diff --git a/fs/udf/balloc.c b/fs/udf/balloc.c
index 82372e3..b2d96f4 100644
--- a/fs/udf/balloc.c
+++ b/fs/udf/balloc.c
@@ -547,7 +547,7 @@
 		}
 
 		if (epos.offset + (2 * adsize) > sb->s_blocksize) {
-			char *sptr, *dptr;
+			unsigned char *sptr, *dptr;
 			int loffset;
 
 			brelse(oepos.bh);
diff --git a/fs/udf/dir.c b/fs/udf/dir.c
index 61d9a76..f0f2a43 100644
--- a/fs/udf/dir.c
+++ b/fs/udf/dir.c
@@ -45,8 +45,8 @@
 	int block, iblock;
 	loff_t nf_pos = (filp->f_pos - 1) << 2;
 	int flen;
-	char *fname = NULL;
-	char *nameptr;
+	unsigned char *fname = NULL;
+	unsigned char *nameptr;
 	uint16_t liu;
 	uint8_t lfi;
 	loff_t size = udf_ext0_offset(dir) + dir->i_size;
diff --git a/fs/udf/inode.c b/fs/udf/inode.c
index f90231e..378a759 100644
--- a/fs/udf/inode.c
+++ b/fs/udf/inode.c
@@ -1672,7 +1672,7 @@
 		return -1;
 
 	if (epos->offset + (2 * adsize) > inode->i_sb->s_blocksize) {
-		char *sptr, *dptr;
+		unsigned char *sptr, *dptr;
 		struct buffer_head *nbh;
 		int err, loffset;
 		struct kernel_lb_addr obloc = epos->block;
diff --git a/fs/udf/namei.c b/fs/udf/namei.c
index cd21150..7c56ff0 100644
--- a/fs/udf/namei.c
+++ b/fs/udf/namei.c
@@ -34,8 +34,8 @@
 #include <linux/crc-itu-t.h>
 #include <linux/exportfs.h>
 
-static inline int udf_match(int len1, const char *name1, int len2,
-			    const char *name2)
+static inline int udf_match(int len1, const unsigned char *name1, int len2,
+			    const unsigned char *name2)
 {
 	if (len1 != len2)
 		return 0;
@@ -142,15 +142,15 @@
 }
 
 static struct fileIdentDesc *udf_find_entry(struct inode *dir,
-					    struct qstr *child,
+					    const struct qstr *child,
 					    struct udf_fileident_bh *fibh,
 					    struct fileIdentDesc *cfi)
 {
 	struct fileIdentDesc *fi = NULL;
 	loff_t f_pos;
 	int block, flen;
-	char *fname = NULL;
-	char *nameptr;
+	unsigned char *fname = NULL;
+	unsigned char *nameptr;
 	uint8_t lfi;
 	uint16_t liu;
 	loff_t size;
@@ -308,7 +308,7 @@
 {
 	struct super_block *sb = dir->i_sb;
 	struct fileIdentDesc *fi = NULL;
-	char *name = NULL;
+	unsigned char *name = NULL;
 	int namelen;
 	loff_t f_pos;
 	loff_t size = udf_ext0_offset(dir) + dir->i_size;
@@ -885,16 +885,16 @@
 {
 	struct inode *inode;
 	struct pathComponent *pc;
-	char *compstart;
+	const char *compstart;
 	struct udf_fileident_bh fibh;
 	struct extent_position epos = {};
 	int eoffset, elen = 0;
 	struct fileIdentDesc *fi;
 	struct fileIdentDesc cfi;
-	char *ea;
+	uint8_t *ea;
 	int err;
 	int block;
-	char *name = NULL;
+	unsigned char *name = NULL;
 	int namelen;
 	struct buffer_head *bh;
 	struct udf_inode_info *iinfo;
@@ -970,7 +970,7 @@
 
 		pc = (struct pathComponent *)(ea + elen);
 
-		compstart = (char *)symname;
+		compstart = symname;
 
 		do {
 			symname++;
diff --git a/fs/udf/symlink.c b/fs/udf/symlink.c
index c3265e1..852e918 100644
--- a/fs/udf/symlink.c
+++ b/fs/udf/symlink.c
@@ -32,12 +32,12 @@
 #include <linux/buffer_head.h>
 #include "udf_i.h"
 
-static void udf_pc_to_char(struct super_block *sb, char *from, int fromlen,
-			   char *to)
+static void udf_pc_to_char(struct super_block *sb, unsigned char *from,
+			   int fromlen, unsigned char *to)
 {
 	struct pathComponent *pc;
 	int elen = 0;
-	char *p = to;
+	unsigned char *p = to;
 
 	while (elen < fromlen) {
 		pc = (struct pathComponent *)(from + elen);
@@ -75,9 +75,9 @@
 {
 	struct inode *inode = page->mapping->host;
 	struct buffer_head *bh = NULL;
-	char *symlink;
+	unsigned char *symlink;
 	int err = -EIO;
-	char *p = kmap(page);
+	unsigned char *p = kmap(page);
 	struct udf_inode_info *iinfo;
 
 	lock_kernel();