4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Richard Weinberger <rich...@nod.at>
commit a00052a296e54205cf238c75bd98d17d5d02a6db upstream.
Commit c83ed4c9dbb35 ("ubifs: Abort readdir upon error") broke
overlayfs support because the fix exposed an internal error
code to VFS.
Reported-by: Peter Rosin <p...@axentia.se>
Tested-by: Peter Rosin <p...@axentia.se>
Reported-by: Ralph Sennhauser <ralph.sennhau...@gmail.com>
Tested-by: Ralph Sennhauser <ralph.sennhau...@gmail.com>
Fixes: c83ed4c9dbb35 ("ubifs: Abort readdir upon error")
Signed-off-by: Richard Weinberger <rich...@nod.at>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
fs/ubifs/dir.c | 8 ++++++++
1 file changed, 8 insertions(+)
--- a/fs/ubifs/dir.c
+++ b/fs/ubifs/dir.c
@@ -454,6 +454,14 @@ out:
if (err != -ENOENT)
ubifs_err(c, "cannot find next direntry, error %d", err);
+ else
+ /*
+ * -ENOENT is a non-fatal error in this context, the TNC uses
+ * it to indicate that the cursor moved past the current
directory
+ * and readdir() has to stop.
+ */
+ err = 0;
+
/* 2 is a special value indicating that there are no more direntries */
ctx->pos = 2;
