ecryptfs: string copy cleanup

Clean up overcomplicated string copy, which also gets rid of this
bogus warning:

fs/ecryptfs/main.c: In function 'ecryptfs_parse_options':
include/asm/arch/string_32.h:75: warning: array subscript is above array bounds

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Cc: Michael Halcrow <mhalcrow@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/ecryptfs/main.c b/fs/ecryptfs/main.c
index 8876fe7..10475d9 100644 (file)
--- a/fs/ecryptfs/main.c
+++ b/fs/ecryptfs/main.c
@@ -301,7 +301,6 @@ static int ecryptfs_parse_options(struct super_block *sb, char *options)
        char *cipher_name_dst;
        char *cipher_name_src;
        char *cipher_key_bytes_src;
-       int cipher_name_len;
 
        if (!options) {
                rc = -EINVAL;
@@ -382,17 +381,12 @@ static int ecryptfs_parse_options(struct super_block *sb, char *options)
                goto out;
        }
        if (!cipher_name_set) {
-               cipher_name_len = strlen(ECRYPTFS_DEFAULT_CIPHER);
-               if (unlikely(cipher_name_len
-                            >= ECRYPTFS_MAX_CIPHER_NAME_SIZE)) {
-                       rc = -EINVAL;
-                       BUG();
-                       goto out;
-               }
-               memcpy(mount_crypt_stat->global_default_cipher_name,
-                      ECRYPTFS_DEFAULT_CIPHER, cipher_name_len);
-               mount_crypt_stat->global_default_cipher_name[cipher_name_len]
-                   = '\0';
+               int cipher_name_len = strlen(ECRYPTFS_DEFAULT_CIPHER);
+
+               BUG_ON(cipher_name_len >= ECRYPTFS_MAX_CIPHER_NAME_SIZE);
+
+               strcpy(mount_crypt_stat->global_default_cipher_name,
+                      ECRYPTFS_DEFAULT_CIPHER);
        }
        if (!cipher_key_bytes_set) {
                mount_crypt_stat->global_default_cipher_key_size = 0;