eCryptfs: remove retry loop in ecryptfs_readdir()

The retry block in ecryptfs_readdir() has been in the eCryptfs code base
for a while, apparently for no good reason.  This loop could potentially
run without terminating.  This patch removes the loop, instead erroring
out if vfs_readdir() on the lower file fails.

Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com>
Reported-by: Al Viro <viro@ZinIV.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 8 insertions, 9 deletions

diff --git a/fs/ecryptfs/file.c b/fs/ecryptfs/file.c
index 9244d653743e..eb3dc4c7ac06 100644
--- a/fs/ecryptfs/file.c
+++ b/fs/ecryptfs/file.c
@@ -71,12 +71,11 @@ struct ecryptfs_getdents_callback {
         void *dirent;
         struct dentry *dentry;
         filldir_t filldir;
-        int err;
         int filldir_called;
         int entries_written;
 };
 
-/* Inspired by generic filldir in fs/readir.c */
+/* Inspired by generic filldir in fs/readdir.c */
 static int
 ecryptfs_filldir(void *dirent, const char *name, int namelen, loff_t offset,
                  u64 ino, unsigned int d_type)
@@ -125,18 +124,18 @@ static int ecryptfs_readdir(struct file *file, void *dirent, filldir_t filldir)
         buf.dirent = dirent;
         buf.dentry = file->f_path.dentry;
         buf.filldir = filldir;
-retry:
         buf.filldir_called = 0;
         buf.entries_written = 0;
-        buf.err = 0;
         rc = vfs_readdir(lower_file, ecryptfs_filldir, (void *)&buf);
-        if (buf.err)
-                rc = buf.err;
-        if (buf.filldir_called && !buf.entries_written)
-                goto retry;
         file->f_pos = lower_file->f_pos;
+        if (rc < 0)
+                goto out;
+        if (buf.filldir_called && !buf.entries_written)
+                goto out;
         if (rc >= 0)
-                fsstack_copy_attr_atime(inode, lower_file->f_path.dentry->d_inode);
+                fsstack_copy_attr_atime(inode,
+                                        lower_file->f_path.dentry->d_inode);
+out:
         return rc;
 }