squashfs: fix name reading in squashfs_xattr_get

Only read potentially matching names into the target buffer, all
obviously non matching names don't need to be read into the
target buffer.

Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>

1 files changed, 6 insertions, 2 deletions

diff --git a/fs/squashfs/xattr.c b/fs/squashfs/xattr.c
index 14a2feef09b9..c7655e8b31cd 100644
--- a/fs/squashfs/xattr.c
+++ b/fs/squashfs/xattr.c
@@ -145,8 +145,12 @@ static int squashfs_xattr_get(struct inode *inode, int name_index,
                 type = le16_to_cpu(entry.type);
                 prefix = type & SQUASHFS_XATTR_PREFIX_MASK;
 
-                err = squashfs_read_metadata(sb, target, &start, &offset,
-                                                        name_size);
+                if (prefix == name_index && name_size == name_len)
+                        err = squashfs_read_metadata(sb, target, &start,
+                                                &offset, name_size);
+                else
+                        err = squashfs_read_metadata(sb, NULL, &start,
+                                                &offset, name_size);
                 if (err < 0)
                         goto failed;