udf: remove unnecessary test in udf_build_ustr_exact()

We can remove parameter checks:

udf_build_ustr_exact() is only called by udf_get_filename()
which now assures dest is not NULL

udf_find_entry() and udf_readdir() call udf_get_filename()
after checking sname
udf_symlink_filler() calls udf_pc_to_char() with sname=kmap(page).

udf_find_entry() and udf_readdir() call udf_get_filename with UDF_NAME_LEN
udf_pc_to_char() with PAGE_SIZE

Suggested-by: Jan Kara <jack@suse.cz>
Signed-off-by: Fabian Frederick <fabf@skynet.be>
Signed-off-by: Jan Kara <jack@suse.cz>

1 files changed, 5 insertions, 9 deletions

diff --git a/fs/udf/unicode.c b/fs/udf/unicode.c
index 4911c1d84882..e2c079aae7c0 100644
--- a/fs/udf/unicode.c
+++ b/fs/udf/unicode.c
@@ -68,17 +68,12 @@ int udf_build_ustr(struct ustr *dest, dstring *ptr, int size)
 /*
  * udf_build_ustr_exact
  */
-static int udf_build_ustr_exact(struct ustr *dest, dstring *ptr, int exactsize)
+static void udf_build_ustr_exact(struct ustr *dest, dstring *ptr, int exactsize)
 {
-        if ((!dest) || (!ptr) || (!exactsize))
-                return -1;
-
         memset(dest, 0, sizeof(struct ustr));
         dest->u_cmpID = ptr[0];
         dest->u_len = exactsize - 1;
         memcpy(dest->u_name, ptr + 1, exactsize - 1);
-
-        return 0;
 }
 
 /*
@@ -340,6 +335,9 @@ int udf_get_filename(struct super_block *sb, uint8_t *sname, int slen,
         struct ustr *filename, *unifilename;
         int ret = 0;
 
+        if (!slen)
+                return -EIO;
+
         filename = kmalloc(sizeof(struct ustr), GFP_NOFS);
         if (!filename)
                 return -ENOMEM;
@@ -350,9 +348,7 @@ int udf_get_filename(struct super_block *sb, uint8_t *sname, int slen,
                 goto out1;
         }
 
-        if (udf_build_ustr_exact(unifilename, sname, slen))
-                goto out2;
-
+        udf_build_ustr_exact(unifilename, sname, slen);
         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8)) {
                 if (!udf_CS0toUTF8(filename, unifilename)) {
                         udf_debug("Failed in udf_get_filename: sname = %s\n",