ubifs: Fix regression in ubifs_readdir()

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 <peda@axentia.se>
Tested-by: Peter Rosin <peda@axentia.se>
Reported-by: Ralph Sennhauser <ralph.sennhauser@gmail.com>
Tested-by: Ralph Sennhauser <ralph.sennhauser@gmail.com>
Fixes: c83ed4c9dbb35 ("ubifs: Abort readdir upon error")
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/ubifs/dir.c b/fs/ubifs/dir.c
index 102ae0c582c12d7bd1c8ed283a012eaea345387c..f5d5ee43ae6eb775a59f0d2deee5ba907531f45a 100644 (file)
--- 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;