[PATCH V2 7/9 linux-next] udf: return error when newIndex is 0 in udf_translate_to_linux()

[Fabian Frederick <fabf@skynet.be>]

udf_get_filename() and its callsites considered 0 as an error
without propagating an error value.

udf_translate_to_linux() now returns -EINVAL when newIndex is 0.
other functions are updated accordingly.

Signed-off-by: Fabian Frederick <fabf@skynet.be>
---
 fs/udf/dir.c     | 2 +-
 fs/udf/namei.c   | 2 +-
 fs/udf/unicode.c | 4 ++--
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/fs/udf/dir.c b/fs/udf/dir.c
index fcf227e..541d9c6 100644
--- a/fs/udf/dir.c
+++ b/fs/udf/dir.c
@@ -168,7 +168,7 @@ static int udf_readdir(struct file *file, struct dir_context *ctx)
 		}
 
 		flen = udf_get_filename(sb, nameptr, lfi, fname, UDF_NAME_LEN);
-		if (flen <= 0)
+		if (flen < 0)
 			continue;
 
 		tloc = lelb_to_cpu(cfi.icb.extLocation);
diff --git a/fs/udf/namei.c b/fs/udf/namei.c
index 59b340c..dd648b7 100644
--- a/fs/udf/namei.c
+++ b/fs/udf/namei.c
@@ -234,7 +234,7 @@ static struct fileIdentDesc *udf_find_entry(struct inode *dir,
 			continue;
 
 		flen = udf_get_filename(sb, nameptr, lfi, fname, UDF_NAME_LEN);
-		if ((flen > 0) && udf_match(flen, fname, child->len,
+		if ((flen >= 0) && udf_match(flen, fname, child->len,
 					    child->name))
 			goto out_ok;
 	}
diff --git a/fs/udf/unicode.c b/fs/udf/unicode.c
index f37123b..3b1efbb 100644
--- a/fs/udf/unicode.c
+++ b/fs/udf/unicode.c
@@ -333,7 +333,7 @@ int udf_get_filename(struct super_block *sb, uint8_t *sname, int slen,
 		     uint8_t *dname, int dlen)
 {
 	struct ustr *filename, *unifilename;
-	int ret = 0;
+	int ret;
 
 	if (!slen)
 		return -EIO;
@@ -492,5 +492,5 @@ static int udf_translate_to_linux(uint8_t *newName, int newLen,
 		}
 	}
 
-	return newIndex;
+	return newIndex ? : -EINVAL;
 }
-- 
1.9.1