eCryptfs: Return useful code from contains_ecryptfs_marker
Instead of having the calling functions translate the true/false return
code to either 0 or -EINVAL, have contains_ecryptfs_marker() return 0 or
-EINVAL so that the calling functions can just reuse the return code.
Also, rename the function to ecryptfs_validate_marker() to avoid callers
mistakenly thinking that it returns true/false codes.
Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
diff --git a/fs/ecryptfs/crypto.c b/fs/ecryptfs/crypto.c
index f48c498..162f9ba 100644
--- a/fs/ecryptfs/crypto.c
+++ b/fs/ecryptfs/crypto.c
@@ -1024,25 +1024,25 @@
}
/**
- * contains_ecryptfs_marker - check for the ecryptfs marker
+ * ecryptfs_validate_marker - check for the ecryptfs marker
* @data: The data block in which to check
*
- * Returns one if marker found; zero if not found
+ * Returns zero if marker found; -EINVAL if not found
*/
-static int contains_ecryptfs_marker(char *data)
+static int ecryptfs_validate_marker(char *data)
{
u32 m_1, m_2;
m_1 = get_unaligned_be32(data);
m_2 = get_unaligned_be32(data + 4);
if ((m_1 ^ MAGIC_ECRYPTFS_MARKER) == m_2)
- return 1;
+ return 0;
ecryptfs_printk(KERN_DEBUG, "m_1 = [0x%.8x]; m_2 = [0x%.8x]; "
"MAGIC_ECRYPTFS_MARKER = [0x%.8x]\n", m_1, m_2,
MAGIC_ECRYPTFS_MARKER);
ecryptfs_printk(KERN_DEBUG, "(m_1 ^ MAGIC_ECRYPTFS_MARKER) = "
"[0x%.8x]\n", (m_1 ^ MAGIC_ECRYPTFS_MARKER));
- return 0;
+ return -EINVAL;
}
struct ecryptfs_flag_map_elem {
@@ -1217,10 +1217,7 @@
__func__, rc);
goto out;
}
- if (!contains_ecryptfs_marker(data + ECRYPTFS_FILE_SIZE_BYTES)) {
- rc = -EINVAL;
- } else
- rc = 0;
+ rc = ecryptfs_validate_marker(data + ECRYPTFS_FILE_SIZE_BYTES);
out:
return rc;
}
@@ -1496,11 +1493,9 @@
crypt_stat->mount_crypt_stat = &ecryptfs_superblock_to_private(
ecryptfs_dentry->d_sb)->mount_crypt_stat;
offset = ECRYPTFS_FILE_SIZE_BYTES;
- rc = contains_ecryptfs_marker(page_virt + offset);
- if (rc == 0) {
- rc = -EINVAL;
+ rc = ecryptfs_validate_marker(page_virt + offset);
+ if (rc)
goto out;
- }
if (!(crypt_stat->flags & ECRYPTFS_I_SIZE_INITIALIZED))
ecryptfs_i_size_init(page_virt, ecryptfs_dentry->d_inode);
offset += MAGIC_ECRYPTFS_MARKER_SIZE_BYTES;
@@ -1575,11 +1570,10 @@
rc = ecryptfs_read_xattr_region(page_virt, inode);
if (rc)
goto out;
- if (!contains_ecryptfs_marker(page_virt + ECRYPTFS_FILE_SIZE_BYTES)) {
+ rc = ecryptfs_validate_marker(page_virt + ECRYPTFS_FILE_SIZE_BYTES);
+ if (rc)
printk(KERN_WARNING "Valid data found in [%s] xattr, but "
"the marker is invalid\n", ECRYPTFS_XATTR_NAME);
- rc = -EINVAL;
- }
out:
return rc;
}